02288nas a2200253   4500008004100000022001400041245005500055210005500110260011000165300001400275490000700289520142600296653003001722653002701752653002101779653002901800653001601829653002301845100002001868700001901888700001801907700002001925856008901945       2012                        eng d  a0376-471000aCarbon dioxide capture by metal organic frameworks0 aCarbon dioxide capture by metal organic frameworks  aDR K S KRISHNAN MARG, PUSA CAMPUS, NEW DELHI 110 012, INDIAbNATL INST SCIENCE COMMUNICATION-NISCAIRcSEP  a1223-12300 v513 a<p>The design and synthesis of functionalized metal organic framework materials (MOFs) for reversible physisorption of CO2 is discussed. This strategy of CO2 adsorption in MOFs requires less energy for regeneration than materials relying on chemisorption. As a result the MOFs have received considerable attention as sorbent materials for strategic gases such as CO2 and H,. In this review, we have discussed different MOFs and hybrid materials containing MOFs which can adsorb CO2 at room temperature. In order to achieve high adsorption capacity, fast CO2 adsorption-desorption and low energy requirement for regeneration are necessary. Several avenues for increasing the CO2 adsorption capacity of such materials, for instance, introduction of open metal sites and the use of ligand molecules with specific functionalities (like -OH or -NH2) have been described. It has been observed that CO2 loading capacity of MOFs increases with functionalization. Herein, we have discussed how N-containing and fluorinated MOFs are designed to achieve higher CO2 loading than their non-functionalized counterparts. Nanocarbons (e.g. carbon nanotubes, carbon nanofibres, etc.) are porous materials and a blend of these porous materials with porous MOFs or porous carbon derived from MOFs may act as a better adsorbate than even the pure materials. Enhancement of CO2 loading by nanocarbon-MOF hybrid material is also discussed.</p>10aCarbon dioxide adsorbents10aCarbon dioxide capture10ahybrid materials10aMetal organic frameworks10aNanocarbons10aPorous nanocarbons1 aSaha, Subhadeep1 aChandra, Suman1 aGarai, Bikash1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/carbon-dioxide-capture-metal-organic-frameworks-002243nas a2200241   4500008004100000022001400041245012400055210006900179260007100248300001600319490000800335520133000343100001901673700002401692700002301716700001801739700002501757700002801782700002501810700001801835700002001853856012801873       2013                        eng d  a0002-786300aChemically stable multilayered covalent organic nanosheets from covalent organic frameworks via mechanical delamination0 aChemically stable multilayered covalent organic nanosheets from   a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcNOV  a17853-178610 v1353 a<p>A series of five thermally and chemically stable functionalized covalent organic frameworks (COFs), namely, TpPa-NO2, TpPa-F-4, TpBD-(NO2)(2), TpBD-Me-2, and TpBD-(OMe)(2) were synthesized by employing the solvothermal aldehyde-amine Schiff base condensation reaction. In order to complete the series, previously reported TpPa-1, TpPa-2, and TpBD have also been synthesized, and altogether, eight COFs were fully characterized through powder X-ray diffraction (PXRD), Fourier transform IR (FT-IR) spectroscopy, C-13 solid-state NMR spectroscopy, and thermogravimetric analysis. These COFs are crystalline, permanently porous, and stable in boiling water, acid (9 N HCl), and base (3 N NaOH). The. synthesized COFs (all eight) were successfully delaminated using a simple, safe, and environmentally friendly mechanical grinding route to transform into covalent organic nanosheets (CONs) and were well characterized via transmission electron microscopy and atomic force microscopy. Further PXRD and FT-IR analyses confirm that these CONs retain their structural integrity throughout the delamination process and also remain stable in aqueous, acidic, and basic media like the parent COFs. These exfoliated CONs have graphene-like layered morphology (delaminated layers), unlike the COFs from which they were synthesized.</p>1 aChandra, Suman1 aKandambeth, Sharath1 aBiswal, Bishnu, P.1 aLukose, Binit1 aKunjir, Shrikant, M.1 aChaudhary, Minakshi, V.1 aBabaRao, Ravichandar1 aHeine, Thomas1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/chemically-stable-multilayered-covalent-organic-nanosheets-covalent-organic-frameworks-001505nas a2200205   4500008004100000022001400041245009200055210006900147260007100216300001400287490000800301520074100309100002301050700001901073700002401092700001801116700001801134700002101152856012601173       2013                        eng d  a0002-786300aMechanochemical synthesis of chemically stable isoreticular covalent organic frameworks0 aMechanochemical synthesis of chemically stable isoreticular cova  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcAPR  a5328-53310 v1353 a<p>Three thermally and chemically stable isoreticular covalent organic frameworks (COFs) were synthesized via room-temperature solvent-free mechanochemical grinding. These COFs were successfully compared with their solvothermally synthesized counterparts in all aspects. These solvent-free mechanochemically synthesized COFs have moderate crystallinity with remarkable stability in boiling water, acid (9 N HCl), and base [TpBD (MC) in 3 N NaOH and TpPa-2 (MC) in 9 N NaOH]. Exfoliation of COF layers was simultaneously observed with COF formation during mechanochemical synthesis. The structures thus obtained seemed to have a graphene-like layered morphology (exfoliated layers), unlike the parent COFs synthesized solvothermally.</p>1 aBiswal, Bishnu, P.1 aChandra, Suman1 aKandambeth, Sharath1 aLukose, Binit1 aHeine, Thomas1 aBanerjeet, Rahul  uhttps://library.ncl.res.in/content/mechanochemical-synthesis-chemically-stable-isoreticular-covalent-organic-frameworks-001510nas a2200217   4500008004100000022001400041245009400055210006900149260007100218300001400289490000800303520070500311100001901016700001701035700002401052700002501076700002401101700002501125700002001150856012201170       2014                        eng d  a0002-786300aPhosphoric acid loaded azo (-N=N-) based covalent organic framework for proton conduction0 aPhosphoric acid loaded azo NN based covalent organic framework f  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAY  a6570-65730 v1363 a<p>Two new chemically stable functional crystalline covalent organic frameworkds (COFs) (Tp-Azo and Tp-Stb) were synthesized using the Schiff base reaction between triformylphloroglucinol (Tp) and 4,4'-azodianiline (Azo) or 4,4'-diaminostilbene (Stb), respectively. Both COFs show the expected keto-enamine form, and high stability toward boiling water, strong acidic, and basic media. H3PO4 doping in Tp-Azo leads to immobilization of the acid within the porous framework, which facilitates proton conduction in both the hydrous (sigma = 9.9 X 10(-4) S cm(-1)) and anhydrous state (sigma = 6.7 X 10(-5) S cm-1). This report constitutes the first emergence of COFs as proton conducting materials.</p>1 aChandra, Suman1 aKundu, Tanay1 aKandambeth, Sharath1 aBabaRao, Ravichandar1 aMarathe, Yogesh, N.1 aKunjir, Shrikant, M.1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/phosphoric-acid-loaded-azo-nn-based-covalent-organic-framework-proton-conduction-000602nas a2200181   4500008004100000022001400041245008100055210006900136260000800205300001000213490000700223653000800230653001400238653002200252100001900274700002000293856010700313       2014                        eng d  a2053-273300aRole of hydrogen bonding in pseudocapacitance of covalent organic frameworks0 aRole of hydrogen bonding in pseudocapacitance of covalent organi  cMAR  aC11490 v7010aCOF10aH-bonding10apseudocapacitance1 aChandra, Suman1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/role-hydrogen-bonding-pseudocapacitance-covalent-organic-frameworks02168nas a2200241   4500008004100000022001400041245013800055210006900193260007300262300001000335490000700345520125800352653001601610653001701626653002601643653002701669653002901696653002201725100002001747700001701767700001901784856012301803       2015                        eng d  a1387-700300aConstruction and structural diversity of Cd-MOFs with pyrazole based flexible ligands and positional isomer of naphthalenedisulfonate0 aConstruction and structural diversity of CdMOFs with pyrazole ba  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV  a35-400 v613 a<p>In the present communication, we have reported the construction of a series of Cd(II)-MOFs using conformationally flexible ligand (CFL); 3,3',5,5'-tetramethy1-4,4'-bipyrazolyl (H(2)BPz), flexible bent ligand (FBL); methylenebis-(3,5-dimethylpyrazole) (H(2)MBPz) and positional isomer of naphthalene disulfonic acid salt ligands (1,5-NDS, 2,6-NDS). By using these ligands, four new coordination polymers namely [Cd(H(2)MBPz)(2) center dot 1,5-NDSA](n) (NDS-MOF-1), [Cd(H(2)BPz)center dot 1,5-NDSA](n) (NDS-MOF-2), {[Cd(H(2)MBPz)(2)](2+)center dot 2,6-NDSA(2-)}(n), (NDS-MOF-3) and {[Cd(H(2)BPz)(2)](2+).2,6-NDSA(n)(2-}) (NDS-MOF-4) have been synthesized. The crystal structure analysis revealed that the employment of positional isomeric naphthalene disulfonic acid salts resulted in different architectures ranging from one dimensional chain to two dimensional grid network and further connected into a three dimensional supramolecular structure through intermolecular hydrogen bonds, pi center dot center dot center dot pi and C-H center dot center dot center dot pi interactions. In addition, the photophysical properties and thermal stability studies for all the NDS-M0F5 1-4 were also investigated. (C) 2015 Elsevier B.V. All rights reserved.</p>10aCadmium(II)10aConformation10acoordination polymers10aNaphthalenedisulfonate10aPhotophysical properties10athermal stability1 aSingh, Udai, P.1 aSingh, Neetu1 aChandra, Suman  uhttps://library.ncl.res.in/content/construction-and-structural-diversity-cd-mofs-pyrazole-based-flexible-ligands-and-201821nas a2200241   4500008004100000022001400041245010700055210006900162260011000231300001600341490000600357520090000363100002301263700002401286700001901310700002901329700001701358700001901375700001801394700002201412700002001434856012501454       2015                        eng d  a2050-748800aPore surface engineering in porous, chemically stable covalent organic frameworks for water adsorption0 aPore surface engineering in porous chemically stable covalent or  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcNOV  a23664-236690 v33 a<p>Herein, we have explored the possibility of a class of covalent organic frameworks (COFs) as water adsorbing materials. We have selected, synthesized 12 chemically stable functionalized Schiff base COFs and thoroughly studied their water uptake behaviour. Further, a deep understanding was developed with these COFs towards the effects of condensation pressure of water and hydrophilic/hydrophobic groups present in the COF pores on water absorption capacity and ultimately, their recyclability. Among all reported COFs, TpPa-1 shows the highest water uptake of 30 wt% (368 cm(3) g(-1); 17 mmol g(-1)) at P/P-0 = 0.3, which is also comparable with the recently reported carbon materials and few well known MOFs. This study also reveals that the overall water uptake of COFs can be tuned systematically based on chemical functionality and pore size in a wider window of relative pressures.</p>1 aBiswal, Bishnu, P.1 aKandambeth, Sharath1 aChandra, Suman1 aShinde, Digambar, Balaji1 aBera, Saibal1 aKarak, Suvendu1 aGarai, Bikash1 aKharul, Ulhas, K.1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/pore-surface-engineering-porous-chemically-stable-covalent-organic-frameworks-water-001778nas a2200205   4500008004100000022001400041245009400055210006900149260007100218300001400289490000700303520101700310100001901327700001701346700001701363700002601380700001801406700002001424856012801444       2016                        eng d  a0897-475600aInterplaying intrinsic and extrinsic proton conductivities in covalent organic frameworks0 aInterplaying intrinsic and extrinsic proton conductivities in co  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAR  a1489-14940 v283 a<p>A sulfonic-acid-based covalent organic framework (TpPa-SO3H) has been synthesized that exhibits intrinsic proton conductivity under anhydrous conditions. The sulfonic acid groups are aligned on the two-dimensional (2D) layers at periodic intervals and promote the proton hopping inside the hexagonal one-dimensional channel. The intrinsic proton conductivity of TpPa-SO3H was measured as 1.7 X 10(-5) S cm(-1) at 120 degrees C under anhydrous conditions. To enhance the proton conductivity, we have synthesized a hybrid COF TpPa(SO3H-Py) by a ligand-based solid-solution approach that contains sulfonic acid as the acidic site, as well as pyridine as the basic site, in order to immobilize acidic proton carrier molecules. Impregnation of phytic acid molecules inside the framework increases the anhydrous proton conductivity up to 5 x 10(-4) S cm(-1) at 120 degrees C. Such an approach highlights the advantage and first-time use of hybrid COF for interplaying intrinsic to extrinsic proton conductivity.</p>1 aChandra, Suman1 aKundu, Tanay1 aDey, Kaushik1 aAddicoat, Matthew, A.1 aHeine, Thomas1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/interplaying-intrinsic-and-extrinsic-proton-conductivities-covalent-organic-frameworks-001919nas a2200193   4500008004100000022001400041245008900055210006900144260000800213300001600221490000800237520125000245100001401495700002301509700001901532700002901551700002501580856012001605       2021                        eng d  a1932-744700aPhotoactive anthraquinone-based host-guest assembly for long-lived charge separation0 aPhotoactive anthraquinonebased hostguest assembly for longlived   cMAY  a10891-109000 v1253 aPorous 2D covalent organic frameworks (COF) that are assembled axially through weak p-stacking interactions can provide reticular charge transport channels while playing host to kinetically stabilized reactive molecular redox states. Here we demonstrate a host-guest supramolecular charge transfer (CT) assembly using photoactive anthraquinone-based COF as an acceptor while incarcerating the electron donor N,N-dimethylaniline (DMA) inside it. Employing femtosecond broadband transient absorption spectroscopy in combination with electron paramagnetic resonance (EPR) studies, we show that the CT occurs rapidly within <110 fs after photoexcitation, subsequently leading to long-lived charge separation with 13% quantum efficiency at room temperature. The photoinduced EPR signature of the long-lived confined DMA cation radical confirms the disparate regions of charge localization while H-1-C-13 correlation experiments using solid-state NMR spectroscopy enumerate the packing of the amines inside the host-guest COF assembly. Our work demonstrates the potency of charge transport pathways in supramolecular assemblies for efficient charge separation which if optimally tuned should pave the way for COF-based photocatalytic reaction centers.1 aJha, Ajay1 aMote, Kaustubh, R.1 aChandra, Suman1 aMadhu, Perunthiruthy, K.1 aDasgupta, Jyotishman  uhttps://library.ncl.res.in/content/photoactive-anthraquinone-based-host-guest-assembly-long-lived-charge-separation