01510nas 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-001821nas 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-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