01367nas a2200205 4500008004100000022001400041245010800055210006900163260010200232300001200334490000800346520054500354653001600899653002100915653002900936653002600965100002100991700002001012856012901032 2011 eng d a0011-389100aStructural and gas adsorption study of a two-dimensional copper-tetrazole based metal-organic framework0 aStructural and gas adsorption study of a twodimensional copperte aC V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIAbINDIAN ACAD SCIENCEScOCT a894-8990 v1013 a

A new two-dimensional (2D) metal organic framework, Cu-1(4-TBA)(1)(DMBP)(1).DMF (Cu-TBA-3), has been synthesized under solvothermal condition from transition metal cation Cu(II), predesigned ligand 4-(1H-tetrazole-5-yl)benzoic acid (4-TBA) and coligand 4,4'-dimethy1-2,2'-bipyridine (DMBP). The structure has been determined by single crystal X-ray crystallography which shows layered 2D structure with square shaped one-dimensional channels. Cu-TBA-3 shows 0.69 wt% H-2 (at 77 K, 1 atm) and 1.65 mmol/g CO2 (at 298 K, 1 atm) uptake.

10aCO2 capture10aHydrogen storage10ametal-organic frameworks10amicroporous materials1 aPachfule, Pradip1 aBanerjee, Rahul uhttp://library.ncl.res.in/content/structural-and-gas-adsorption-study-two-dimensional-copper-tetrazole-based-metal-organic-002312nas a2200241 4500008004100000022001400041245012600055210006900181260000800250520143000258653001601688653003201704653002201736653002301758653002501781100002601806700002201832700002201854700002001876700001801896700003001914856012601944 2019 eng d a1861-472800aAg nanoparticles supported on a resorcinol-phenylenediamine-based covalent organic framework for chemical fixation of CO20 aAg nanoparticles supported on a resorcinolphenylenediaminebased  cOCT3 a

Covalent organic frameworks are a new class of crystalline organic polymers possessing a high surface area and ordered pores. Judicious selection of building blocks leads to strategic heteroatom inclusion into the COF structure. Owing to their high surface area, exceptional stability and molecular tunability, COFs are adopted for various potential applications. The heteroatoms lining in the pores of COF favor synergistic host-guest interaction to enhance a targeted property. In this report, we have synthesized a resorcinol-phenylenediamine-based COF which selectively adsorbs CO2 into its micropores (12 angstrom). The heat of adsorption value (32 kJ mol(-1)) obtained from the virial model at zero-loading of CO2 indicates its favorable interaction with the framework. Furthermore, we have anchored small-sized Ag nanoparticles (approximate to 4-5 nm) on the COF and used the composite for chemical fixation of CO2 to alkylidene cyclic carbonates by reacting with propargyl alcohols under ambient conditions. Ag@COF catalyzes the reaction selectively with an excellent yield of 90 %. Recyclability of the catalyst has been demonstrated up to five consecutive cycles. The post-catalysis characterizations reveal the integrity of the catalyst even after five reaction cycles. This study emphasizes the ability of COF for simultaneous adsorption and chemical fixation of CO2 into corresponding cyclic carbonates.

10aCO2 capture10acovalent organic frameworks10acyclic carbonates10aPropargyl alcohols10asilver nanoparticles1 aChakraborty, Debanjan1 aShekhar, Pragalbh1 aSingh, Himan, Dev1 aKushwaha, Rinku1 aVinod, C., P.1 aVaidhyanathan, Ramanathan uhttp://library.ncl.res.in/content/ag-nanoparticles-supported-resorcinol-phenylenediamine-based-covalent-organic-framework01840nas a2200277 4500008004100000022001400041245006900055210006600124260000800190300001200198490000800210520104000218653001601258653001501274653001101289653001501300653000801315653000801323100002201331700002601353700001801379700002401397700001801421700002401439856009901463 2019 eng d a0925-838800aMWCNTs-ZnO-SiO2 mesoporous nano-hybrid materials for CO2 capture0 aMWCNTsZnOSiO2 mesoporous nanohybrid materials for CO2 capture cSEP a279-2850 v8003 a

Carbon nanostructures and metal nanoparticles based nanohybrid materials have been established as one of advantageous materials for various applications. Here, we present hydrothermal and sol-gel process at low temperature for the synthesis of (3-Aminopropyl) triethoxysilane (APTES)-ZnO-multi-walled carbon nanotubes (MWCNTs) mesoporous nanohybrid materials. TEM and XPS measurements show that uniform size and quasi-spherical ZnO nanoparticles were anchored to the surface of the MWCNTs. SEM observation exhibits that the aggregation of ZnO nanoparticles is greatly reduced due to the steric repulsion of grafted organic groups. The maximum CO2 adsorption capacity at 273 K was 1.32 mmol/g for MWCNTs-APTES-ZnO-B nanohybrid. An increase in the density of ZnO nanoparticles on the surface of MWCNTs resulted in a higher affinity towards CO2 at low pressure. This work provides new research directions for making further advances toward practical utilization of MWCNTs-based CO2 adsorbents. (C) 2019 Published by Elsevier B.V.

10aCO2 capture10aMesoporous10aMWCNTs10aNanohybrid10aTEM10aXPS1 aJena, Kishore, K.1 aPanda, Amulya, Prasad1 aVerma, Savita1 aMani, Ganesh, Kumar1 aSwain, S., K.1 aAlhassan, Saeed, M. uhttp://library.ncl.res.in/content/mwcnts-zno-sio2-mesoporous-nano-hybrid-materials-co2-capture02164nas a2200253 4500008004100000022001400041245008400055210006900139260000800208300001500216490000700231520135000238653001601588653001701604653001101621653001701632100002201649700002201671700002601693700002101719700002801740700003001768856011201798 2022 eng d a1861-472800aCoordination flexibility aided CO2-specific gating in an iron isonicotinate MOF0 aCoordination flexibility aided CO2specific gating in an iron iso cFEB ae2021013050 v173 a

Coordination flexibility assisted porosity has been introduced into an Iron-isonicotinate metal-organic framework (MOF), (Fe(4-PyC)(2) . (OH). The framework showed CO2-specific gate opening behavior, which gets tuned as a function of temperature and pressure. The MOF ` s physisorptive porosity towards CO2, CH4, and N-2 was investigated; it adsorbed only CO2 via a gate opening phenomenon. The isonicotinate, representing a borderline soft base, is bound to the hard Fe3+ centre through monodentate carboxylate and pyridyl nitrogen. This moderately weak binding enables isonicotinate to spin like a spindle under the CO2 pressure opening the gate for a sharp increase in CO2 uptake at 333 mmHg (At 298 K, the CO2 uptake increases from 0.70 to 1.57 mmol/g). We investigated the MOF ` s potential for CO2/N-2 and CO2/CH4 gas separation aided by this gating. IAST model reveals that the CO2/N-2 selectivity jumps from 325 to 3131 when the gate opens, while the CO2/CH4 selectivity increases three times. Interestingly, this Fe-isonicotinate MOF did not follow the trend set by our earlier reported Hard-Soft Gate Control (established for isostructural M2+-isonicotinate MOFs (M=Mg, Mn)). However, we account for this discrepancy using the different oxidation state of metals confirmed by X-ray photoelectron spectroscopy and magnetism.

10aCO2 capture10aflexible MOF10agating10aIsonicotinic1 aSingh, Himan, Dev1 aNandi, Shyamapada1 aChakraborty, Debanjan1 aSingh, Kirandeep1 aVinod, Chathakudath, P.1 aVaidhyanathan, Ramanathan uhttp://library.ncl.res.in/content/coordination-flexibility-aided-co2-specific-gating-iron-isonicotinate-mof