01507nas a2200181 4500008004100000022001400041245012300055210006900178260007100247300001400318490000700332520078300339100002101122700001401143700001901157700002001176856012901196 2010 eng d a1528-748300aStructural, magnetic, and gas adsorption study of a two-dimensional tetrazole-pyrimidine based metal-organic framework0 aStructural magnetic and gas adsorption study of a twodimensional a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJUN a2475-24780 v103 a

A new two-dimensional (2D) metal-organic framework, Cu-TP-1, has been synthesized under solvothermal conditions (DMF) from the transition metal cation Cu(II) and 2-tetrazole pyrimidine (C5H5N6, H-TP). The structure has been determined by single crystal X-ray crystallography which shows a (6,3) honeycomb 2D net with perpendicular one-dimensional channels. Permanent porosity of Cu-TP-1 has been determined by the nitrogen adsorption isotherm. Cu-TP-1 show interesting H-2 and CO2 uptake. CO2 uptake of Cu-TP-1 (at 298 K, 1 atm pressure) is seen to be comparable to the recently reported ZIF-95 which outperforms ZIF-100 and BPL carbon. The magnetic properties show an antiferromagnetically coupled Cu ... Cu interaction down to 8 K with a Weiss temperature around 108 K.

1 aPachfule, Pradip1 aDas, Raja1 aPoddar, Pankaj1 aBanerjee, Rahul uhttps://library.ncl.res.in/content/structural-magnetic-and-gas-adsorption-study-two-dimensional-tetrazole-pyrimidine-based-002511nas a2200181 4500008004100000022001400041245013100055210006900186260007100255300001400326490000700340520177900347100002102126700001402147700001902161700002002180856012902200 2011 eng d a1528-748300aSolvothermal synthesis, structure, and properties of metal organic framework isomers derived from a partially fluorinated link0 aSolvothermal synthesis structure and properties of metal organic a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcAPR a1215-12220 v113 a

Solvothermal reactions of Cu(NO3)(2) center dot 3H(2)O with 4,4'-(hexafluoroisopropylidene) bis(benzoic acid) (C17H10F6O4, H(2)hfbba) and terminal monodentate ligand 3-methyl pyridine (3-picoline/3-mepy) in the presence of N, N-dimethyl formamide (DMF) and N,N-diethyl formamide (DEF) solvents gave rise to two structurally different two-dimensional (2D) fluorinated metal organic frameworks (F-MOFs). The effect of the choice of solvent has been clearly reflected in the structures obtained. The F-MOFs reported in this paper are formulated as [Cu-2(hfbba)(2)(3-mepy)(2)] center dot (DMF)(2)(3-mepy) (F-MOF-4), [Cu-2(hfbba)(2)(3-mepy)(2)] (Cu-F-MOF-4B), and [Zn-2(hfbba)(2)(3-mepy)(2)] center dot (3-mepy) (Zn-F-MOF-4B) which displays interesting 2D structures with and without interdigitation depending on the solvent used. The structures of these F-MOFs have been determined by X-ray crystallography and further identified by IR spectroscopy, powder X-ray diffraction (PXRD), and thermogravimetric analysis (TGA). The effect of interdigitation has been reflected in the gas adsorption and magnetic properties of these F-MOFs. These F-MOFs also show comparable H-2 and CO2 uptake depending on their structural variation. Temperature-dependent magnetic susceptibility measurements over a wide range of temperatures exhibit dominantly short-range antiferromagnetic behavior, with weak ferromagnetic behavior showing up at very low temperatures, which is evident from opening of the hysteresis loop with a finite value of coercivity in both F-MOF-4 and Cu-F-MOF-4B. We observed a smaller value of mu(eff) per Cu atom and coercivity in Cu-F-MOF-4B than the F-MOF-4 due to relatively larger distances between the neighboring dicopper paddlewheel secondary building unit.

1 aPachfule, Pradip1 aDas, Raja1 aPoddar, Pankaj1 aBanerjee, Rahul uhttps://library.ncl.res.in/content/solvothermal-synthesis-structure-and-properties-metal-organic-framework-isomers-derived-002006nas a2200193 4500008004100000022001400041245013000055210006900185260007100254300001200325490000700337520124800344100001701592700001401609700002101623700001901644700002001663856012901683 2011 eng d a1528-748300aStructural and selective gas adsorption studies of polyoxometalate and tris(ethylenediamine) cobalt(III) based ionic crystals0 aStructural and selective gas adsorption studies of polyoxometala a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJAN a139-1460 v113 a

Seven new ionic solids built on polyoxometalate anions and [Co(en)(3)](3+) cations, namely, [Co(en)(3)Mo(8)O(26)(H(3)O)-(Cl)](DMF)(4)(H(2)O) (Co-Mo(8)-DMF), [alpha-PW(12)O(40)][Co(en)(3)]center dot 6DMF (Co-W(12)P-DMF), [alpha-PW(12)O(40)][Co(en)(3)]center dot 6DEF (Co-W(12)P-DEF), [alpha-PMo(12)O(40)][Co(en)(3)]center dot 5.5DMF (Co-Mo(12)P-DMF), [alpha-PMo(12)O(40)][Co(en)(3)]center dot 6DEF (Co-Mo(12)P-DEF), [alpha-SiW(12)O(40)]-[Co(en)(3)](3/2)[Cl](1/2)center dot 6DMF center dot 3H(2)O (Co-W(12)Si-DMF), and [alpha-SiW(12)O(40)][Co(en)(3)]center dot 6DEF (Co-W(12)Si-DEF), have been synthesized from nonaqueous (DMF/DEF) media and characterized by single-crystal X-ray diffraction. We attempt to understand if [Co(en)(3)](3+) cations used in these reaction systems play a crucial role in controlling the assembly of these crystals. These ionic solids, after removal of the DMF or DEF molecules, are found to exhibit size selective H(2) adsorption properties over N(2). The amount of hydrogen adsorption was influenced by POM anion types and their orientations. CoMo(12)P-DEF has the highest (0.9 wt %) H(2) uptake, and CoW(12)P-DEF has the lowest (0.4 wt %) uptake among the series when the adsorbate pressure approached 1 atm.

1 aDey, Chandan1 aDas, Raja1 aPachfule, Pradip1 aPoddar, Pankaj1 aBanerjee, Rahul uhttps://library.ncl.res.in/content/structural-and-selective-gas-adsorption-studies-polyoxometalate-and-trisethylenediamine-002015nas a2200181 4500008004100000022001400041245012300055210006900178260007100247300001400318490000700332520129100339100002101630700001401651700001901665700002001684856012901704 2011 eng d a0020-166900aStructural, magnetic, and gas adsorption study of a series of partially fluorinated metal-organic frameworks (HF-MOFs)0 aStructural magnetic and gas adsorption study of a series of part a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAY a3855-38650 v503 a

Four new partially fluorinated metal organic frameworks (HF-MOFs) have been synthesized under different solvothermal conditions (H2O or dimethylformamide (DMF)) from transition metal cations [Co2+ and Mn2+], 3-methyl pyridine (3-mepy) and 4,4'-(hexafluoroisopropylidene) bis(benzoic acid) (C17H10F6O4, H(2)hfbba), to determine the influence of reaction conditions on the formation of MOFs. This family of materials displays a striking degree of structural similarity depending on the solvent of synthesis. HF-MOFs synthesized from H2O [Co-HFMOF-W, Co(liffiba)(3-mepy)(H2O) and Mn-HFMOF-W, Mn(hfbba)(3-mepy)(H2O)] contain three-dimensional connectivity whereas HF-MOFs synthesized from DmF Co-HFMOF-D, [Co-2(hfbba)(2)(3-mepy)(2)]center dot(DMF)(3) and Mn-HFMOE-D, [Mn-2(hfbba)(2)(3-mepy)]center dot(H2O) are two-dimensional in nature. Co-HFMOF-W and Mn-HFMOF-W are iso-structural polymeric materials. Thermal gravimetric analysis performed on as-synthesized HP-MOFs revealed that these compounds have high thermal stability (similar to 350 degrees C). The continuous decrease of the chi T product with decreasing T for Co-HFMOF-D and Co-HFMOF-W respectively indicates the presence of antiferromagnetic exchange interaction between two Co2+ (S = 3/2) metal centers within a duster.

1 aPachfule, Pradip1 aDas, Raja1 aPoddar, Pankaj1 aBanerjee, Rahul uhttps://library.ncl.res.in/content/structural-magnetic-and-gas-adsorption-study-series-partially-fluorinated-metal-organic-002882nas a2200181 4500008004100000022001400041245013600055210006900191260007100260300001400331490000800345520213500353100002002488700001402508700002702522700001902549856013202568 2011 eng d a1932-744700aSurface effects on morin transition, exchange bias, and enchanced spin reorientation in chemically synthesized DyFeO3 nanoparticles0 aSurface effects on morin transition exchange bias and enchanced  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcFEB a2954-29600 v1153 a

A giant linear magnetoelectric effect was observed by Y. Tokura's group recently in multiferroic DyFeO3, which demands a detailed investigation of its magnetic properties. Additionally, there is little information on the changes of chemical and physical properties of these materials with the reduction in particle size in spite of the potential applications of these materials nanoscale devices. As the wet-chemical synthesis of these materials in nanosize and getting a control over crystallinity and stoichiometry is nontrivial and poses a serious challenge prohibiting the study of their size-dependent properties. Here, we report the synthesis of DyFeO3 nanoparticles using a surfactantless hydrothermal method with a detailed magnetic property measurement. The as-synthesized DyFeO3 nanoparticles showed excellent crystallinitywith average particle size in the range 50-60 nm. The structural analysis indicated that they are of a distorted orthorhombic pervoslcite crystal structure. Detailed dc magnetization measurements in the temperature range of 3-350 K could isolate the presence of Dy3+-Fe3+ and Dy3+-Dy3+ superexchange interactions, which showed up as spin reorientation transitions in various temperature regions due to the differing magnitude of their interactions resulting in continuous rotation of antiferromagnetic component of Fe3+ spins with cooling of the sample. Nanosized DyFeO3 showed spin-reorientation transitions near 315 and 70K due to the Dy3+-Fe3+ interaction accompanied with an opening up of the hysteresis loop followed by antiferromagnetic ordering around 4 K due to a possible Dy3+-Dy3+ interaction. We also observed significant effect of the particle size reduction on the magnetic properties. The main effects seen. by us were in terms of (1) pronounced spontaneous spin reorientation transitions, (2) the absence of Morin transition, and (3) presence of temperature-dependent exchange bias in the DyFeO3 nanoparticles. We present a detailed mechanism to explain these features based on the interplay of Dy3+ and Fe3+ spins as well surface disorder, anisotropy, canting, and so forth.

1 aJaiswal, Adhish1 aDas, Raja1 aAdyanthaya, Suguna, D.1 aPoddar, Pankaj uhttps://library.ncl.res.in/content/surface-effects-morin-transition-exchange-bias-and-enchanced-spin-reorientation-chemically-001264nas a2200217 4500008004100000022001400041245005800055210005800113260007400171300001400245490000700259520054300266653001700809653001800826653003000844100002000874700001400894700002700908700001900935856009200954 2011 eng d a1388-076400aSynthesis and optical studies of GdCrO3 nanoparticles0 aSynthesis and optical studies of GdCrO3 nanoparticles aVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDSbSPRINGERcMAR a1019-10270 v133 a

{Here we report for the first time, a detailed synthesis mechanism of GdCrO3 nanoparticles using a surfactant-less hydrothermal method. We also report a detailed study of their structural and optical properties. The selected area electron diffraction and powder X-ray diffraction studies of GdCrO3 nanoparticles show pure phase and excellent crystallinity with average particle size around 50-60 nm. The structural analysis indicates a distorted perovskite crystal structure with lattice parameter values of a = 5.3099 +/- A 0.0022

10ahydrothermal10aNanoparticles10aRare earth orthochromites1 aJaiswal, Adhish1 aDas, Raja1 aAdyanthaya, Suguna, D.1 aPoddar, Pankaj uhttps://library.ncl.res.in/content/synthesis-and-optical-studies-gdcro3-nanoparticles-001774nas a2200181 4500008004100000022001400041245010400055210006900159260007100228300001000299490000700309520108200316100001701398700001401415700001901429700002001448856012401468 2012 eng d a1528-748300aSolid phase morphological diversity of a rare vanadium cubane (V4O16) based metal organic framework0 aSolid phase morphological diversity of a rare vanadium cubane V4 a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJAN a12-170 v123 a

A Cu(II) connected V4O16-cubane based metal organic framework, Cu-2(phen)(2)(V4O8) (PO4)(4) [Cu2V4O16-2D] was synthesized under hydrothermal conditions. This is the first example of transition metal connected V4O16-cubane based MOF. X-ray single crystal data shows the alternate arrangement V4O16-cubane and Cu(phen)(O)(3) square pyramidal unit in two dimensions. These two-dimensional sheets are stacked on top of each other to form a three-dimensional architecture. Cu2V4O16-2D shows two types of solid state morphologies of the same phase, which was confirmed by scanning electron microscopy. It is noteworthy that this type of morphological difference of the solid phase in an extended metal organic hybrid material is rare and has not been perceived in the polyoxovanadate based MOFs literature. Cu2V4O16-2D was further characterized by powder X-ray diffraction (PXRD), thermal gravimetric analysis (TGA), IR-spectroscopy, scanning electron microscopy (SEM), and elemental analysis. We also studied the static magnetic and gas adsorption properties for Cu2V4O16-2D.

1 aDey, Chandan1 aDas, Raja1 aPoddar, Pankaj1 aBanerjee, Rahul uhttps://library.ncl.res.in/content/solid-phase-morphological-diversity-rare-vanadium-cubane-v4o16-based-metal-organic-001223nas a2200181 4500008004100000245017000041210006900211260000800280300001400288490000700302520050100309100001900810700002200829700001400851700001900865700002700884856013000911 2012 eng d00aSyntheses, crystal structures, and magnetic properties of metal-organic hybrid materials of Co(II) using flexible and rigid nitrogen-based ditopic ligands as spacers0 aSyntheses crystal structures and magnetic properties of metalorg cMAR a1571-15780 v123 a

{A carboxylate-based flexible ligand, 5-(4-carboxybenzyloxy)isophthalic acid (p-cbiaH(3)), readily reacts with Co(II) salts in the presence of different pyridine-based coligands such as 4-bis(4-pyridinylmethyl)piperazine (bpmp) or 1,2-di(4-pyridyl)ethylene (dpe) under hydrothermal conditions to afford two different three-dimensional (3D) coordination polymers, {[Co-4(OH)(2)(p-cbia)(2)(bpmp)-(H2O)(3)]center dot 2H(2)O}(n) (1) and {[Co-4(OH)(2)(p-cbia)(2)(dpe)(H2O)(4)]center dot 2H(2)O\

1 aAhmad, Musheer1 aSharma, Mamsh, K.1 aDas, Raja1 aPoddar, Pankai1 aBharadwaj, Parimal, K. uhttps://library.ncl.res.in/content/syntheses-crystal-structures-and-magnetic-properties-metal-organic-hybrid-materials-coii-001157nas a2200181 4500008004100000245010700041210006900148260000800217300001400225490000700239520050500246100001900751700001400770700001500784700001900799700002700818856013000845 2012 eng d00aSynthesis, characterization, and magnetic studies of coordination polymers with Co(II) and Mn(II) ions0 aSynthesis characterization and magnetic studies of coordination  cSEP a4624-46320 v123 a

{An ether bridged tricarboxylic acid ligand, 5-(4-carboxybenzyloxy)isophthalic acid (p-cbiaH(3)) has been used to construct three coordination polymers with Co(II) salts in presence of different nitrogen donor ligands such as 1,4-bis(4-pyridinylmethyl)piperazine (bpmp), dipyridine-4-yl-diazene (dpd), and 4,4'-bipyridine (bpy). The products formed under hydrothermal conditions are formulated as {[Co-3(p-cbia)(2)(bpmp)(2)(H2O)(6)]center dot 10H(2)O}(n) (1), {[Co-2(p-cbiaH)(2)(dpd)(H2O)(2)]\

1 aAhmad, Musheer1 aDas, Raja1 aLama, Prem1 aPoddar, Pankaj1 aBharadwaj, Parimal, K. uhttps://library.ncl.res.in/content/synthesis-characterization-and-magnetic-studies-coordination-polymers-coii-and-mnii-ions-001963nas a2200181 4500008004100000022001400041245013500055210006900190260011000259300001600369490000600385520119500391100001801586700002001604700001401624700001901638856012401657 2013 eng d a2046-206900aStatic and dynamic magnetic properties and effect of surface chemistry on the morphology and crystallinity of DyCrO3 nanoplatelets0 aStatic and dynamic magnetic properties and effect of surface che aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcOCT a26427-264320 v33 a

In this contribution, the structural and magnetic properties of DyCrO3 nanoplatelets, synthesized by a hydrolytic sol-gel method, have been investigated. The crystalline phase of DyCrO3 was attained at the decomposition temperature of 800 degrees C for citric acid and oxalic acid, respectively and their structural analysis indicates a distorted orthorhombic perovskite structure of the DyCrO3 nanoplatelets. The dc-magnetization curve shows the Neel temperature of similar to 144 and similar to 146 K for DyCrO3 nanoplatelets synthesized using citric acid (DCO (C)) and oxalic acid (DCO (O)), respectively. In addition, DCO (O) shows weak anomalies at similar to 22 and similar to 6 K in the zero-field-cooled and field-cooled magnetization curves. Below the Neel temperature, DCO (C) and DCO (O) exhibit cross-over from positive to negative magnetization at similar to 143 and similar to 145 K, respectively. This was attributed to a Dy3+-Cr3+ interaction, which resulted in a weak ferromagnetic coupling (seen as a small opening in the M-H curves). The low temperature transition observed at similar to 6 K can be assigned to the onset of Dy3+-Dy3+ antiferromagnetic interaction.

1 aGupta, Preeti1 aBhargava, Richa1 aDas, Raja1 aPoddar, Pankaj uhttps://library.ncl.res.in/content/static-and-dynamic-magnetic-properties-and-effect-surface-chemistry-morphology-and-002069nas a2200169 4500008004100000022001400041245013400055210006900189260008100258300001100339490000700350520136000357100001401717700002001731700001901751856012901770 2013 eng d a0022-372700aStatic and dynamic magnetic properties and interplay of Dy3+, Gd3+ and Mn3+ spins in orthorhombic DyMnO3 and GdMnO3 nanoparticles0 aStatic and dynamic magnetic properties and interplay of Dy3 Gd3  aTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLANDbIOP PUBLISHING LTDcJAN a0453010 v463 a

Single-phase orthorhombic DyMnO3 and GdMnO3 nanoparticles in the size range 60-70 and 35-45 nm, respectively, were synthesized using a modified hydrothermal method. The magnetic property measurements of DyMnO3 nanocrystals show anomalies around similar to 43K (antiferromagnetic (AFM) coupling between Mn3+ spins) and at 7K in the form of a peak in the zero-field-cooled curve (AFM coupling between Dy3+ spins). Whereas, GdMnO3 undergoes a phase transition at similar to 42K from paramagnetic to an incommensurate-antiferromagnetic phase (ICAFM) followed by a second anomaly at similar to 22 K, which could be associated with the transition from ICAFM into a canted A-type AFM ordering of the Mn3+ spins. This transition is followed by a long-range ordering of the Gd3+ moments at 6K yielding the canting of the Gd3+ spins with a ferromagnetic (FM) component antiparallel to the FM moment of the canted Mn3+ spins. No anomaly near the Neel temperature of the Mn moments for both DyMnO3 and GdMnO3 nanoparticles was observed in ac magnetization which were observed in dc magnetization. The room temperature Raman spectra of DyMnO3 shows two most intense Raman modes at 480 and 609 cm(-1) which can be assigned to an antisymmetric Jahn-Teller stretching mode and a symmetric or breathing stretching mode, respectively, involving Mn-O bond stretching.

1 aDas, Raja1 aJaiswal, Adhish1 aPoddar, Pankaj uhttps://library.ncl.res.in/content/static-and-dynamic-magnetic-properties-and-interplay-dy3-gd3-and-mn3-spins-orthorhombic-002361nas a2200265 4500008004100000022001400041245011400055210006900169260009900238300001200337490000600349520141000355653001901765653002301784653002001807653001201827653001801839100001501857700002201872700001401894700002201908700001901930700002201949856012401971 2015 eng d a1998-012400aSelf-assembled vertically aligned gold nanorod super-lattices for ultra-high sensitive detection of molecules0 aSelfassembled vertically aligned gold nanorod superlattices for  aTSINGHUA UNIV, RM A703, XUEYAN BLDG, BEIJING, 10084, PEOPLES R CHINAbTSINGHUA UNIV PRESScMAR a907-9190 v83 a

We show that self-assembled vertically aligned gold nanorod (VA-GNRs) superlattices can serve as probes or substrates for ultra-high sensitive detection of various molecules. D-glucose and 2,4,6-trinitrotoluene (TNT) have been chosen as model systems due to their very low Raman cross-sections (5.6 x 10(-30) cm(2).molecule(-1).sr(-1) for D-glucose and 4.9 x 10(-31) cm(2). molecule(-1).sr(-1) for TNT) to show that the VA-GNR superlattice assembly offers as low as yoctomole sensitivity. Our experiment on mixed samples of bovine serum albumin (BSA) and D-glucose solutions demonstrate sensitivity for the latter, and the possible extension to real samples. Self-assembled superlattices of VA-GNRs were achieved on a silicon wafer by depositing a drop of solvent containing the GNRs and subsequent solvent evaporation in ambient conditions. An additional advantage of the VA-GNR monolayers is their extremely high reproducible morphology accompanied by ultrahigh sensitivity which will be useful in many fields where a very small amount of analyte is available. Moreover the assembly can be reused a number of times after removing the already present molecules. The method of obtaining VA-GNRs is simple, inexpensive and reproducible. With the help of simulations of monolayers and multilayers it has been shown that superlattices can achieve better sensitivity than monolayer assembly of VA-GNRs.

10aNanostructures10aRaman spectroscopy10aself-assemblies10asensors10asuperlattices1 aApte, Amey1 aBhaskar, Prashant1 aDas, Raja1 aChaturvedi, Smita1 aPoddar, Pankaj1 aKulkarni, Sulabha uhttps://library.ncl.res.in/content/self-assembled-vertically-aligned-gold-nanorod-super-lattices-ultra-high-sensitive-0