02607nas a2200277   4500008004100000022001400041245017500055210006900230260007500299300001400374490000700388520154500395653002001940653001901960653002101979653002802000653002902028100001502057700001902072700002002091700002102111700001802132700002202150700002702172856013002199       2016                        eng d  a0947-653900aVersatile Cu-II metal-organic framework exhibiting high gas storage capacity with selectivity for CO2: conversion of CO2 to cyclic carbonate and other catalytic abilities0 aVersatile CuII metalorganic framework exhibiting high gas storag  aPOSTFACH 101161, 69451 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcMAR  a3387-33960 v223 a<p>A linear tetracarboxylic acid ligand, H4L, with a pendent amine moiety solvothermally forms two isostructural metal-organic frameworks (MOFs) L-M (M=Zn-II, Cu-II). Framework L-Cu can also be obtained from L-Zn by post- synthetic metathesis without losing crystallinity. Compared with L-Zn, the L-Cu framework exhibits high thermal stability and allows removal of guest solvent and metal-bound water molecules to afford the highly porous, L-Cu. At 77K, L-Cu absorbs 2.57wt% of H-2 at 1bar, which increases significantly to 4.67wt% at 36bar. The framework absorbs substantially high amounts of methane (238.38cm(3)g(-1), 17.03wt%) at 303K and 60bar. The CH4 absorption at 303K gives a total volumetric capacity of 166cm(3)(STP)cm(-3) at 35bar (223.25cm(3)g(-1), 15.95wt%). Interestingly, the NH2 groups in the linker, which decorate the channel surface, allow a remarkable 39.0wt% of CO2 to be absorbed at 1bar and 273K, which comes within the dominion of the most famous MOFs for CO2 absorption. Also, L-Cu shows pronounced selectivity for CO2 absorption over CH4, N-2, and H-2 at 273K. The absorbed CO2 can be converted to value-added cyclic carbonates under relatively mild reaction conditions (20bar, 120 degrees C). Finally, L-Cu is found to be an excellent heterogeneous catalyst in regioselective 1,3-dipolar cycloaddition reactions (click reactions) and provides an efficient, economic route for the one-pot synthesis of structurally divergent propargylamines through three-component coupling of alkynes, amines, and aldehydes.</p>10aclick reactions10aCO2 absorption10acyclic carbonate10aheterogeneous catalysis10ametal-organic frameworks1 aDe, Dinesh1 aPal, Tapan, K.1 aNeogi, Subhadip1 aSenthilkumar, S.1 aDas, Debasree1 aGupta, Sayam, Sen1 aBharadwaj, Parimal, K.  uhttps://library.ncl.res.in/content/versatile-cu-ii-metal-organic-framework-exhibiting-high-gas-storage-capacity-selectivity-002724nas a2200325   4500008004100000022001400041245014100055210006900196260000800265490000700273520157300280653002101853653004001874653004101914653002801955100001601983700002601999700002102025700002802046700002002074700002002094700001902114700001902133700002002152700002402172700003202196700002202228700002002250856012802270       2026                        eng d  a0935-964800aChirality transfer from covalent organic framework nanotubes to covalent organic framework films via chirality induction crystallization0 aChirality transfer from covalent organic framework nanotubes to   cAPR0 v383 a<p>
	We report the synthesis of homochiral crystalline covalent organic framework (COF) films that combine rigidity and porosity, offering significant promise for heterogeneous asymmetric catalysis. We prepared enantiopure COF films from achiral diamine and trialdehyde precursors using a chiral induction crystallization strategy. A Schiff-base reaction, catalyzed by a chiral acid, namely (R)- and (S)-camphorsulfonic acids (CSA) generated a beta-ketoenamine backbone with induced chirality. (R)- and (S)-camphorsulfonic acids direct the diamine-trialdehyde condensation and induce chirality during the nucleation of COF nanotubes, enabling their periodic arrangement and the formation of homochiral thin films. We successfully synthesized six distinct COF films with three different backbone functionalities: R-, S-TpAzo; R-, S-TpDPP; and R-, S-TpBDMe2, using the two enantiomers of the chiral camphorsulfonic acids. All films displayed strong circular dichroism signals and pronounced Cotton effects, confirming their enhanced enantiopurity. Both R- and S-TpAzo films exhibited the highest crystallinity, long-range order, and permanent porosity, making them particularly well-suited for catalytic applications. To demonstrate their utility, we encapsulated a bioinspired catalyst, (Et4N)2[FeIII(Cl)bTAML], within the chiral channels of the R- and S-TpAzo films. The resulting composite created a robust heterogeneous catalytic platform for the asymmetric epoxidation of alkenes, achieving excellent activity and enantioselectivity under ambient conditions.</p>
10achiral induction10acovalent organic framework nanotube10acovalent organic framework thin film10aheterogeneous catalysis1 aBag, Saikat1 aChatterjee, Debasmita1 aMahapatra, Rohan1 aSasmal, Himadri, Sekhar1 aKhatua, Arindam1 aGiri, Madhurima1 aPaul, Satyadip1 aShelke, Ankita1 aAlmasoud, Najla1 aAlomar, Taghrid, S.1 aAjithkumar, Thalasseril, G.1 aGupta, Sayam, Sen1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/chirality-transfer-covalent-organic-framework-nanotubes-covalent-organic-framework-films