02459nas a2200253 4500008004100000022001400041245022200055210006900277260007300346300001000419490000700429520141500436653002001851653002801871653002101899653001801920653002501938653002901963653003401992653002502026100001902051700001302070856012202083 2005 eng d a1387-181100aSynthesis, characterization and catalytic application of Ru-II-ethylenediamine complex - mesoporous silica as heterogeneous catalyst system in chemo-selective hydrogenation of alpha,beta-unsaturated carbonyl compounds0 aSynthesis characterization and catalytic application of RuIIethy aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC a33-440 v873 a

An efficient heterogeneous catalyst system for chemo-selective hydrogenation of alpha,beta-unsaturated aldehydes was synthesized, involving anchoring of a Ru-II-phosphine complex on the inner surfaces of organo-functionalized (propylamine and propylethylenediamine) mesoporous MCM-41 and MCM-48 materials. Powder XRD, SEM and TEM experiments reveal highly ordered hexagonal and cubic patterns of the organically modified MCM-41 and MCM-48 materials, respectively, even after incorporation of Ru complexes. Moreover, the integrity of the Ru complex was retained after anchoring into the mesoporous hosts, which was supported by FTIR, P-31 CP MAS NMR and XPS analyses. This heterogeneous catalyst shows promising activity and chemo-selectivity towards hydrogenation of carbonyl groups in alpha,beta-unsaturated aldehydes. The effects of reaction temperature, reaction time and hydrogen pressure on the activity and selectivity were studied in detail. The anchored solid catalysts can be recycled effectively and reused several times without any loss in activity and selectivity. Although, the initial activity of the same Ru complex when grafted onto the organically modified surfaces of fumed silica is comparable to corresponding MCM41/MCM-48 catalysts, the activity and chemo-selectivity significantly decrease during recycle of the catalyst due to leaching. (c) 2005 Elsevier Inc. All rights reserved.

10achemo-selective10aheterogeneous catalysis10aHeterogenization10aHydrogenation10amesoporous materials10aorgano-functionalization10aRu-II-ethylenediamine complex10aunsaturated aldehyde1 aGhosh, Anirban1 aKumar, R uhttps://library.ncl.res.in/content/synthesis-characterization-and-catalytic-application-ru-ii-ethylenediamine-complex02980nas a2200289 4500008004100000022001400041245013400055210006900189260007600258300001400334490000700348520191000355653001902265653002502284653001702309653001902326653002402345100002602369700001902395700003502414700002102449700002402470700002002494700002802514700001702542856013102559 2008 eng d a0947-653900aHeteropoly acid encapsulated SBA-15/TiO(2) nanocomposites and their unusual performance in acid-catalysed organic transformations0 aHeteropoly acid encapsulated SBA15TiO2 nanocomposites and their  aCOMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USAbWILEY-BLACKWELLcFEB a3200-32120 v143 a

The preparation of SBA-15/TiO(2) nanocomposites with different loadings of Keggin-type 12-tungsto-phosphoric acid (TPA) nanocrystals in their mesochannels through a simple and effective vacuum impregnation method is reported for the first time. The catalysts have been characterised by various sophisticated techniques, including XRD, HRSEM, and TEM. It has been found that the acidity and the textural parameters of the nanocomposites can be controlled by simply changing the loadings of TPA and TiO(2) or the calcination temperature. TPA and TiO(2) loadings of 15 and 22.4 wt %, respectively, and a calcination temperature of 1123 K have proved to be optimal for obtaining mesoporous nanocomposite materials with the highest acidity. Moreover, the activities of these catalysts in promoting hydroamination as well as Mannich and Claisen rearrangement reactions have been extensively investigated. The results show that the amount of TPA has a great influence on the activity of the nanocomposites in all of the reactions studied. The effects of other reaction parameters, such as temperature and reaction time, on the conversion and product selectivity have also been studied in detail. A kinetic analysis of the formation of the products under various reaction conditions is presented. It has been found that the activity of the nanocomposite composed of 15 wt % TPA deposited on 22.4 wt of TiO(2) on SBA-15 in promoting the studied reaction is remarkably higher than the catalytic activities shown by pure TPA, TiO(2)-loaded SBA-15, or TPA-loaded SBA-15. The results obtained have indicated that the acidity and the structural control of the nanocomposite materials are highly critical for obtaining excellent catalytic activity, and the presented highly acidic nanocomposites are considered to show great potential for use as catalysts in promoting many acid-catalysed organic transformations.

10aBronsted acids10amesoporous materials10ananoreactors10ananotechnology10asupported catalysts1 aSawant, Dhanashri, P.1 aJustus, Josena1 aBalasubramanian, Veerappan, V.1 aAriga, Katsuhiko1 aSrinivasu, Pavuluri1 aVelmathi, Sivan1 aHalligudi, Shivappa, B.1 aVinu, Ajayan uhttps://library.ncl.res.in/content/heteropoly-acid-encapsulated-sba-15tio2-nanocomposites-and-their-unusual-performance-acid-001653nas a2200217 4500008004100000022001400041245014800055210006900203260009500272300001200367490000800379520076600387653002401153653002501177653001301202653001501215653003101230100002001261700002801281856012601309 2008 eng d a0021-951700aStudies in structural characterization and correlation with the catalytic activity of an efficient and stable WOx/SBA-15 nanocomposite catalyst0 aStudies in structural characterization and correlation with the  a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcJUL a283-2900 v2573 a

A new WOx/SBA-15 nanocomposite catalyst system was developed by hydrothermal synthesis. The material was characterized by X-ray diffraction, high-resolution transmission electron microscopy, sorption analysis, FT-IR, CP-MAS NMR, XPS, and energy-dispersive X-ray analysis. Various types of aromatic and aliphatic sulfides were selectively oxidized to sulfoxides in good to excellent yields without becoming overoxidized to the sulfones using 70% aq. tert-butyl hydrogen peroxide in the presence of nanocomposite catalyst at room temperature. The catalyst could be easily recovered and reused for at least eight reaction cycles under the reaction conditions described here with no significant loss of reactivity. (c) 2008 Elsevier Inc. All rights reserved.

10acatalytic oxidation10amesoporous materials10aSulfides10aSulfoxides10atungsten oxide nanocluster1 aBordoloi, Ankur1 aHalligudi, Shivaraj, B. uhttps://library.ncl.res.in/content/studies-structural-characterization-and-correlation-catalytic-activity-efficient-and-002476nas a2200241 4500008004100000022001400041245009600055210006900151260007500220300001200295490000700307520158400314653002501898653002801923653002501951653002401976653002702000100002002027700001802047700001802065700002202083856012902105 2008 eng d a1571-101300aSynthesis, characterization and catalytic activity of Sn-SBA-15 mesoporous molecular sieves0 aSynthesis characterization and catalytic activity of SnSBA15 mes a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGER/PLENUM PUBLISHERScDEC a283-3090 v123 a

Our recent reports on the synthesis of Sn-incorporated mesoporous SBA-15 materials have been reviewed. The preparation of the samples with different Si/Sn ratios followed two procedures, the first is the post-synthesis modification of SBA-15 by impregnation with Sn chloride or acetate, and the second is the direct method in which Sn chloride was introduced in to Si precursor along with amphiphilic triblock copolymer, while varying the ratio of the synthesis gel. Detailed characterization of the Sn-SBA-15 samples by a variety of techniques shows how the synthesis procedures influence the properties of the samples that reflect on the differences in (a) the structural features, (b) morphology and textural properties, such as the pore characteristics, (c) the possible location of Sn4+ ions in the meso silica structure and their reducibility, (d) the nature of the Sn species and their the coordination sphere and (e) the acid-base characteristics. We developed a possible model for the localization of Sn species in SBA-15 pore structure for different conditions of preparation. This report includes our investigations on the catalytic properties of these Sn-SBA-15 samples in 3 industrially important reactions, viz., trans-esterification of diethyl malonate, synthesis of nopol by Prins condensation of beta-pinene with para-formaldehyde and the epoxidation of norbornene. In each of this reaction, while demonstrating the catalytic role of Sn species, we show that the requirement of the type and the environment of Sn species are different for these reactions.

10amesoporous materials10aProperties of Sn-SBA-1510aSn-containing SBA-1510aSn-SBA-15 catalysts10aSynthesis of Sn-SBA-151 aRamaswamy, Veda1 aShah, Pallavi1 aLazar, Karoly1 aRamaswamy, A., V. uhttps://library.ncl.res.in/content/synthesis-characterization-and-catalytic-activity-sn-sba-15-mesoporous-molecular-sieves-002024nas a2200289 4500008004100000022001400041245014200055210006900197260007600266300001400342490000600356520097700362653001201339653002801351653001801379653002501397653001201422100001401434700001701448700003501465700002101500700002101521700001801542700002201560700002201582856013001604 2010 eng d a1867-388000aCovalently immobilized triphenylphosphine rhodium complex: synthesis, characterization, and application in catalytic olefin hydrogenation0 aCovalently immobilized triphenylphosphine rhodium complex synthe aCOMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USAbWILEY-BLACKWELLcNOV a1477-14820 v23 a

A trimethoxysilane functionalized triphenylphosphine was coordinated to rhodium(I) and the resulting rhodium complex was covalently bound to a mesoporous SBA-15 support. The catalytic activity of this hybrid material was studied for the hydrogenation of 2-cyclohexen-1-one and compared with the corresponding homogeneous catalyst. According to the (31)P-MAS NMR data, the catalytically active species was stable against oxidation; no structural change could be detected after exposing it to air for more than two months. Transmission electron microscopy (TEM) measurements on the used catalyst confirmed that the rhodium species was also stable against reduction to the metal because the formation of rhodium nanoparticles during the catalysis could be excluded. The kinetic curves of the recycled system confirmed that this hybrid catalyst shows excellent activity, selectivity, stability, and reusability, and is truly heterogeneous in the hydrogenation reaction.

10aalkenes10aheterogeneous catalysis10aHydrogenation10amesoporous materials10aRhodium1 aWang, Lei1 aJia, Mingjun1 aShylesh, Sankaranarayanapillai1 aPhilippi, Thomas1 aSeifert, Andreas1 aErnst, Stefan1 aSingh, Anand, Pal1 aThiel, Werner, R. uhttps://library.ncl.res.in/content/covalently-immobilized-triphenylphosphine-rhodium-complex-synthesis-characterization-and-002025nas a2200241 4500008004100000022001400041245011900055210006900174260010600243300001400349490000700363520106900370653002401439653003401463653003301497653002501530653001401555100002301569700002101592700001701613700002201630856013101652 2010 eng d a0277-538700aEfficient heterogeneous catalytic system for chemoselective hydrogenation of unsaturated ketones in aqueous medium0 aEfficient heterogeneous catalytic system for chemoselective hydr aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcNOV a3262-32680 v293 a

A highly chemoselective and green heterogeneous catalytic system of immobilized Ru(II)-phenanthroline complexes on amino functionalised MCM-41 material for the chemoselective hydrogenation of unsaturated ketones to unsaturated alcohols is demonstrated using water as a solvent The XRD and FTIR spectra show the highly ordered hexagonal nature of the MCM-41 even after encapsulation of the ruthenium complex The complex retains its configuration after anchoring as was confirmed by FTIR and UV-Vis analysis The detailed reaction parametric effect was studied for the hydrogenation of 3 methylpent-3-en-2-one to achieve complete conversion up to >99% chemoselectivity of 3-methylpent-3-en-2 ol The anchored heterogeneous catalysts were recycled effectively and reused five times with marginal changes in activity and selectivity The use of water as a solvent not only afforded high activity for the hydroge nation reaction compared to organic solvents but also afforded a green process Crown Copyright (C) 2010 Published by Elsevier Ltd All rights reserved

10a1 10 Phenanthroline10aalpha beta Unsaturated ketone10aChemoselective hydrogenation10amesoporous materials10aruthenium1 aDeshmukh, Amit, A.1 aKinage, Anil, K.1 aKumar, Rajiv1 aMeijboom, Reinout uhttps://library.ncl.res.in/content/efficient-heterogeneous-catalytic-system-chemoselective-hydrogenation-unsaturated-ketones-002272nas a2200229 4500008004100000022001400041245012300055210006900178260007300247300001000320490000800330520141000338653001401748653001701762653001101779653002801790653002501818100002501843700002101868700002901889856012401918 2010 eng d a0926-860X00aHeterogenized copper catalysts for the amination of arylhalide: synthesis, characterization and catalytic applications0 aHeterogenized copper catalysts for the amination of arylhalide s aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN a73-810 v3723 a

This research investigated the synthesis, characterization and catalytic activity of heterogenized copper complexes for the selective amination of aryl halides. Amination reactions using homogeneous copper catalyst systems are not generally selective and it is also difficult to recover the catalyst from the homogeneous system for recycling. To overcome these difficulties, our efforts were directed towards the development of cheaper heterogeneous catalyst systems, which can be easily recovered and recycled. Heterogenized analogs of the homogenous Cu complexes were prepared using two methods: (a) encapsulation of copper complexes in zeolite-Y and (b) tethering of copper complexes on various supports like zeolite-Y, silica, charcoal, or clay. The encapsulated and tethered copper catalysts on zeolite-Y were characterized using EPR, Diffused reflectance UV-vis, XRD, IAS, ICPES, SEM, and TEM. The results confirmed that the copper complexes were truly heterogenized in zeolite-Y support. Encapsulated and tethered copper complexes were tested for amination of aryl iodide. The effects of various reaction parameters were examined using tethered Cu(Phen)(PPh(3))Br-PTA-Y catalyst to determine optimum conditions. A recycle study of encapsulated and tethered Cu catalyst was carried out to test their robustness for possible commercial exploitation. (C) 2009 Elsevier B.V. All rights reserved.

10aAmination10aC-N coupling10aCopper10aheterogeneous catalysis10amesoporous materials1 aPatil, Nandkumar, M.1 aGupte, Sunil, P.1 aChaudhari, Raghunath, V. uhttps://library.ncl.res.in/content/heterogenized-copper-catalysts-amination-arylhalide-synthesis-characterization-and-001453nas a2200229 4500008004100000022001400041245016900055210006900224260007300293300001200366490000800378520054500386653000600931653000600937653003700943653003600980653002501016653002101041100002001062700001701082856012401099 2011 eng d a0926-860X00aImmobilization of 1,5,7-triazabicyclo [4.4.0] dec-5-ene over mesoporous materials: an efficient catalyst for michael-addition reactions under solvent-free condition0 aImmobilization of 157triazabicyclo 440 dec5ene over mesoporous m aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR a250-2580 v3973 a

Immobilization of 1,5,7-triazabicyclo [4.4.0] dec-5-ene (TBD, a bicylic guanidine base) over mesoporous material like SBA-15 has been found to be an excellent catalyst for Michael-addition of beta-nitro styrene with malonate. The reactions were performed under solvent-free condition at 373 K for 9 h. A wide variety of Michael donors and acceptors were investigated. Among them, high yield of Michael product was obtained for the reaction between p-Cl-nitrostyrene with dimethyl malonate. (C) 2011 Elsevier B.V. All rights reserved.

10a110a510a7-triazabicyclo[4.4.0] dec-5-ene10abeta-nitro styrene and malonate10amesoporous materials10aMichael-addition1 aKalita, Pranjal1 aKumar, Rajiv uhttps://library.ncl.res.in/content/immobilization-157-triazabicyclo-440-dec-5-ene-over-mesoporous-materials-efficient-001777nas a2200217 4500008004100000022001400041245012800055210006900183260007300252300001200325490000800337520092300345653002301268653001801291653001901309653002501328653002201353100002301375700002901398856013201427 2012 eng d a0920-586100aAnchored Pd-complexes in mesoporous supports: synthesis, characterization and catalysis studies for carbonylation reactions0 aAnchored Pdcomplexes in mesoporous supports synthesis characteri aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC a154-1730 v1983 a

Pd(pyca)(PPh3)(OTs) [pyca = 2-picolinate] complex is efficiently anchored inside different mesoporous matrices, such as MCM-41, MCM-48, SBA-15 using a molecular aminopropyl tether moiety employing different synthesis strategies. Thorough characterization of the materials using powder XRD, multinuclear (C-13, Si-29, P-31) CP-MAS NMR, XPS, SEM, N-2-sorption studies etc. confirmed the successful anchoring of the palladium complex to the walls of the support matrices thus establishing the synthesis protocols unambiguously. The catalysts were found to be highly active and selective for the carbonylation of different aryl olefins and alcohols. Consecutive recycling and successful reuse proved the stability and true heterogeneous nature of all the anchored catalysts, which is a substantial advancement over the existing heterogeneous catalysts for carbonylation. (C) 2012 Elsevier B. V. All rights reserved.

10aAnchored catalysts10aCarbonylation10aImmobilization10amesoporous materials10aPalladium complex1 aSarkar, Bibhas, R.1 aChaudhari, Raghunath, V. uhttps://library.ncl.res.in/content/anchored-pd-complexes-mesoporous-supports-synthesis-characterization-and-catalysis-studies-002000nas a2200241 4500008004100000022001400041245014400055210006900199260007300268300001000341490000800351520108600359653003401445653002501479653002101504653002401525653001401549653001401563653002001577100001601597700002101613856012401634 2012 eng d a0920-586100aSelective oxidation of cyclic olefins over framework Ti-substituted, three-dimensional, mesoporous Ti-SBA-12 and Ti-SBA-16 molecular sieves0 aSelective oxidation of cyclic olefins over framework Tisubstitut aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC a59-680 v1983 a

Framework Ti-substituted, three-dimensional, mesoporous titanosilicates, Ti-SBA-12 and Ti-SBA-16, were prepared by direct hydrothermal synthesis method. These catalysts showed catalytic activity higher than the hitherto known titanosilicates for the oxidation of cyclic olefins (cyclohexene and cyclooctene) with tert.-butyl hydroperoxide. An epoxide selectivity of 100% and olefin conversion greater than 92% were obtained. Cubic Ti-SBA-16 with interconnected cage-like mesopore structure was more active than hexagonal Ti-SBA-12. X-ray diffraction and diffuse reflectance UV-vis, Fourier transform infrared, Raman and electron paramagnetic resonance spectroscopies provided evidence for the substitution of Ti4+ (for Si4+) in the framework locations. The catalytic activity correlated with the concentration of framework-substituted, tetrahedral Ti4+ ions. Easy accessibility of the active sites and the three-dimensional mesoporous structure are the possible causes for the superior activity of these titanosilicate catalysts. (C) 2012 Elsevier B. V. All rights reserved.

10aEpoxidation of cyclic olefins10amesoporous materials10aMolecular sieves10aSelective oxidation10aTi-SBA-1210aTi-SBA-1610aTitanosilicates1 aKumar, Anuj1 aSrinivas, Darbha uhttps://library.ncl.res.in/content/selective-oxidation-cyclic-olefins-over-framework-ti-substituted-three-dimensional-000987nas a2200253 4500008004100000022001400041245014100055210006900196260007700265300001600342490000700358653003200365653001900397653002500416653001800441653001600459100002400475700002900499700002100528700001800549700001800567700002000585856012800605 2013 eng d a1433-785100aEnhancement of chemical stability and crystallinity in porphyrin-containing covalent organic frameworks by intramolecular hydrogen bonds0 aEnhancement of chemical stability and crystallinity in porphyrin aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcDEC a13052-130560 v5210acovalent organic frameworks10ahydrogen bonds10amesoporous materials10aporphyrinoids10atautomerism1 aKandambeth, Sharath1 aShinde, Digambar, Balaji1 aPanda, Manas, K.1 aLukose, Binit1 aHeine, Thomas1 aBanerjee, Rahul uhttps://library.ncl.res.in/content/enhancement-chemical-stability-and-crystallinity-porphyrin-containing-covalent-organic-001769nas a2200253 4500008004100000022001400041245010500055210006900160260007300229300001000302490000800312520087000320653001401190653003301204653002501237653002501262653001401287653001401301653002001315100002301335700001601358700002101374856012001395 2013 eng d a1381-116900aThree-dimensional, mesoporous titanosilicates as catalysts for producing biodiesel and biolubricants0 aThreedimensional mesoporous titanosilicates as catalysts for pro aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT a65-730 v3773 a

The application of three-dimensional, mesoporous titanosilicates, Ti-SBA-12 and Ti-SBA-16, as reusable solid acid catalysts for producing biodiesel and biolubricants is reported for the first time. Biodiesel was prepared by esterification of oleic acid with monohydric methanol and biolubricants by esterification with polyhydric alcohols (glycerol, trimethylolpropane, neopentyl glycol and pentaerythritol). High catalytic activity of these catalysts is attributed to the presence of dispersed Lewis acidic Ti sites and mesoporosity in the structure. Biodiesel yields as high as 90 mol% were obtained at 443 K. Surface hydrophobicity of the catalyst has also a predominant role, especially, in reactions involving polyhydric alcohols. In those reactions, Ti-SBA-16 showed higher catalytic activity than Ti-SBA-12. (c) 2013 Elsevier B.V. All rights reserved.

10aBiodiesel10aEsterification of fatty acid10aLubricant basestocks10amesoporous materials10aTi-SBA-1210aTi-SBA-1610aTitanosilicates1 aKotwal, Mehejabeen1 aKumar, Anuj1 aDarbha, Srinivas uhttps://library.ncl.res.in/content/three-dimensional-mesoporous-titanosilicates-catalysts-producing-biodiesel-and-001227nas a2200241 4500008004100000022001400041245007300055210006900128260007700197300001400274490000600288520038300294653002600677653002900703653002500732653001900757653002500776100001700801700001800818700001900836700002000855856011000875 2014 eng d a1867-388000aAcid-base cooperative catalysis over mesoporous nitrogen-rich carbon0 aAcidbase cooperative catalysis over mesoporous nitrogenrich carb aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcNOV a3091-30950 v63 a

WOx nanoclusters (2-3 nm) embedded on a mesoporous nitrogen-rich carbon material were synthesized by using novel methodology. This material was very effectively capitalized as a new carbon-based acid-base cooperative catalyst for sequential acetal hydrolysis and Knoevenagel condensation reactions. The protocol was also explored for the nitroaldol condensation reaction.

10acooperative catalysts10aKnoevenagel condensation10amesoporous materials10aNanostructures10anitro aldol reaction1 aGoyal, Reena1 aSarkar, Bipul1 aLucas, Nishita1 aBordoloi, Ankur uhttps://library.ncl.res.in/content/acid-base-cooperative-catalysis-over-mesoporous-nitrogen-rich-carbon-002674nas a2200265 4500008004100000022001400041245011200055210006900167260007700236300001200313490000600325520169700331653002802028653001302056653002502069653001902094653002002113100003302133700002502166700001602191700001502207700002702222700003002249856012902279 2014 eng d a1867-388000aDisordered mesoporous TiO2-xNx+Nano-Au: an electronically integrated nanocomposite for solar H-2 generation0 aDisordered mesoporous TiO2xNxNanoAu an electronically integrated aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcFEB a522-5300 v63 a

We report on H-2 generation by photocatalysis driven by simulated white light by electronically integrated Au nanoparticles with multifunctional, disordered mesoporous TiO2-xNx (Au-NT) nanocomposites. Solar H-2 generation (1.5 mmolh(-1)g(-1)) from aqueous methanol has been demonstrated with Au-NT nanocomposites. The water splitting activity of Au-NT is attributed to the 21.1 ps lifetime of charge carriers observed from fluorescence lifetime measurements, which indicates a high electron-injection efficiency from nano-Au to the conduction band of TiO2, and hence charge separation as well as utilization. This is directly supported by the observation of a high photoluminescence emission intensity with Au-NT that highlights the energy transfer from nano-Au to TiO2. The p-n heterojunction observed between the Au (001) and TiO2 (101) facets helps to-wards the higher charge separation and their utilization. A low mesochannel depth (< 10 nm) associated with disordered mesoporous TiO2-xNx helps the charge carriers to move towards the surface for redox reactions and hence charge utilization. Visible-light absorption, as a result of the surface plasmon resonance of nano-Au, is observed in a broad range between 500 and 750 nm, which helps in harvesting visible-light photons. Finally, electronically integrated nano-Au with TiO2-xNx in Au-NT is evident from Raman and X-ray photoelectron spectroscopy measurements. All of these factors help to achieve a high rate of H-2 production. It is likely that a higher rate of H-2 production than that reported here is feasible by strategically locating Au clusters in porous TiO2 to generate hot spots through electronic integration.

10aheterogeneous catalysis10aHydrogen10amesoporous materials10aphotochemistry10awater splitting1 aSivaranjani, Kumarsrinivasan1 aRajaambal, Sivaraman1 aDas, Tanmay1 aRoy, Kanak1 aBhattacharyya, Somnath1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/disordered-mesoporous-tio2-xnxnano-au-electronically-integrated-nanocomposite-solar-h-2-002420nas a2200289 4500008004100000022001400041245011000055210006900165260007700234300001400311490000600325520138300331653002101714653001901735653002501754653001801779100002801797700003501825700002101860700001901881700001701900700001901917700002401936700002801960700001701988856012502005 2014 eng d a1867-388000aTitania nanoparticles stabilized HPA in SBA-15 for the intermolecular hydroamination of activated olefins0 aTitania nanoparticles stabilized HPA in SBA15 for the intermolec aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcDEC a3347-33540 v63 a

A liquid phase hydroamination (HA) of alpha,beta-ethylenic compounds with amines was investigated with TiO2 nanoparticles stabilized 12-tungstophosphoric acid (TPA) in SBA-15. The catalysts were prepared by wet impregnation of TPA/TiO2 nanoparticles into the SBA-15 and calcined at different temperatures. The characterization results reveal that the textural properties and the acidity of the prepared catalysts can be finely controlled with the simple adjustment of the calcination temperature and the structure of the support, decorated with the TiO2 and TPA nanoparticles, was intact even after the modification. The prepared catalysts were investigated for HA of ethyl acrylate with different aromatic and aliphatic amines over a wide range of reaction conditions to optimize the yield and the selectivity of product. It was found that this process is 100% atom efficient and the catalytic performance depended significantly on the loading of TPA over the catalyst and the calcination temperature. Under optimized reaction conditions, the best catalyst, 15 wt% TPA/22.4 wt% TiO2/SBA-15 calcined at 1123 K, offered the highest conversion of p-ethylaniline (70%) with 100% chemo-selectivity to the anti-Markovnikov product, i.e., the mono-addition product. The reaction was heterogeneously catalyzed and no contribution from leached TPA into the reaction was observed.

10aheteropoly acids10ahydroamination10amesoporous materials10ananocatalysts1 aSawant-Dhuri, Dhanashri1 aBalasubramanian, Veerappan, V.1 aAriga, Katsuhiko1 aPark, Dae-Hwan1 aChoy, Jin-Ho1 aCha, Wang, Soo1 aAl-deyab, Salem, S.1 aHalligudi, Shivappa, B.1 aVinu, Ajayan uhttps://library.ncl.res.in/content/titania-nanoparticles-stabilized-hpa-sba-15-intermolecular-hydroamination-activated-001969nas a2200217 4500008004100000022001400041245014500055210006900200260000800269300001200277490000700289520120000296653001901496653001801515653002501533653001101558653002001569100001801589700001801607856012601625 2017 eng d a1380-222400aSynthesis and characterization of D-2PA-Pd(II)@SBA-15 catalyst via ``click chemistry'': highly active catalyst for Suzuki coupling reactions0 aSynthesis and characterization of D2PAPdIISBA15 catalyst via cli cAPR a327-3400 v243 a

Copper catalysed cycloaddition reaction between azide and terminal alkyne, called as ``click reaction'', was found to be modular approach for the synthesis of facile, highly efficient and recoverable D-2PA-Pd(II)@SBA-15 catalyst. In efforts to synthesize the catalyst, the cycloaddition reaction between azido-functionalized mesoporous SBA-15 and N,N-dimethyl-2-propynylamine (D-2PA) has been carried out, followed by the complexation with PdCl2. To analyze physiochemical properties of synthesized materials, various characterization techniques such as CHN elemental analysis, X-ray diffraction, solid state C-13 and Si-29 NMR spectra, FT-IR, XPS, SEM, TEM and N-2 sorption analysis, TGA and DTA, UV-Vis spectroscopy have been carried out. The synthesized catalyst, D-2PA-Pd(II)@SBA-15, exhibited excellent catalytic activities with good product yield and high TON towards Suzuki coupling reaction of various aryl halides with phenylboronic acid. The effect of solvent, base and temperature on coupling reactions has also been described. The developed protocol offers recyclability of catalyst for multiple (four) times without any appreciable loss in stability and catalytic reactivity.

10aClick reaction10aCycloaddition10amesoporous materials10aSBA-1510aSuzuki coupling1 aPathak, Aruna1 aSingh, A., P. uhttps://library.ncl.res.in/content/synthesis-and-characterization-d-2pa-pdiisba-15-catalyst-click-chemistry-highly-active02122nas a2200253 4500008004100000022001400041245013700055210006900192260000800261300001400269490000700283520120200290653001801492653002101510653002501531653002601556653002801582100002601610700002201636700002401658700002901682700002601711856013101737 2021 eng d a0922-616800aSolvent free, environment benign synthesis of 1,4-dihydropyridines and polyhydroquinolines by using heterogeneous Zn/MCM-41 catalyst0 aSolvent free environment benign synthesis of 14dihydropyridines  cAUG a3263-32870 v473 a

Heterogeneous catalysis has been utilized in number of efficient reactions with higher selectivity of the product, more stable, reusable and easy for separation as compared to homogeneous catalysts. Generally, heterogeneous catalysts are prepared by using mesoporous materials, microporous materials, metal oxides and metal organic framework. The mesoporous materials have small particle size and high surface area as compared to the microporous materials. The adsorbent mesoporous materials have highly efficient for the therapeutic applications in chemistry hence it has best as compared to other heterogeneous materials. Herein, we have reported synthesis of 1,4-dihydropyridines and polyhydroquinolines at solvent free and environmental benign condition in the presence of Zn/MCM-41 catalyst. The present protocol gives excellent yield (89-96%) of the product within short reaction time by easy work up procedure and no need of further purification of product. The catalyst was characterized by XRD diffractometer, SEM, EDAX, TGA-DTA, BET surface area analysis and FT-IR Spectroscopy. The synthesized organic compounds were characterized by FT-IR, H-1 NMR, C-13 NMR, LC-MS spectrometry.

10aHigh activity10aHigh selectivity10amesoporous materials10amicroporous materials10aReusability of catalyst1 aDhengale, Shankar, D.1 aNaik, Vaibhav, M.1 aKolekar, Govind, B.1 aRode, Chandrashekhar, V.1 aAnbhule, Prashant, V. uhttps://library.ncl.res.in/content/solvent-free-environment-benign-synthesis-14-dihydropyridines-and-polyhydroquinolines-using01851nas a2200217 4500008004100000022001400041245010800055210006900163260000800232300001500240490000600255520105700261653003101318653003501349653002501384653001801409653002201427100002801449700002701477856012901504 2023 eng d a2365-654900aRobust optimization and characterization of MCM-41 nanoparticle synthesis using modified sol-gel method0 aRobust optimization and characterization of MCM41 nanoparticle s cMAR ae2022049680 v83 a

Mesoporous silica nanoparticles (MSN) for drug delivery application requires great expertise to synthesize small sized monodisperse particles. We aimed at synthesizing and optimizing MCM-41 particles with the modified Stober's method by adjusting factors such as concentrations of cetyltrimethylammonium bromide (CTAB), sodium hydroxide (NaOH) and water (H2O) with respect to tetraethyl orthosilicate (TEOS), and a process parameter (stirring). We comprehended that the reactants determined the shape and size of both the particles and pores. Upon extensive characterization we report the synthesis of spherical particles of similar to 70 nm size in a monodisperse population; the structures had hexagonal ordered pores of diameter 3.071 nm and volume 3.124 cm(3)/g; the total surface area of 3410.648 m(2)/g of the particles was covered with silanol groups that aid in functionalization; the particles exhibited great thermal stability. Thus, the extensive optimization fabricated robust MCM-41 particles fit for drug delivery application.

10acharacterization technique10adynamic light scattering (DLS)10amesoporous materials10aNanoparticles10asol gel processes1 aShende, Rajnigandha, A.1 aChaudhari, Bhushan, P. uhttps://library.ncl.res.in/content/robust-optimization-and-characterization-mcm-41-nanoparticle-synthesis-using-modified-sol