01093nas a2200193 4500008004100000022001400041245014100055210006900196260011000265300001600375490000700391520025800398100001700656700002900673700002400702700002300726700002000749856013000769 2014 eng d a1359-734500aMechanosynthesis of imine, beta-ketoenamine, and hydrogen-bonded imine-linked covalent organic frameworks using liquid-assisted grinding0 aMechanosynthesis of imine betaketoenamine and hydrogenbonded imi aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJUL a12615-126180 v503 a

A variety of aromatic amines/hydrazides and aldehydes have been utilized for the construction of crystalline COFs at a faster rate and in high yield, irrespective of their reactivity and solubility using the Liquid-Assisted Grinding (LAG) method.

1 aDas, Gobinda1 aShinde, Digambar, Balaji1 aKandambeth, Sharath1 aBiswal, Bishnu, P.1 aBanerjee, Rahul uhttp://library.ncl.res.in/content/mechanosynthesis-imine-beta-ketoenamine-and-hydrogen-bonded-imine-linked-covalent-organic-001788nas a2200181 4500008004100000022001400041245010200055210006900157260007100226300001600297490000800313520109200321100002001413700001701433700001901450700002001469856011701489 2014 eng d a0002-786300aPhotocatalytic metal-organic framework from cds quantum dot incubated luminescent metallohydrogel0 aPhotocatalytic metalorganic framework from cds quantum dot incub a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcOCT a14845-148510 v1363 a

Cadmium sulfide (CdS) quantum dots (<10 nm in size) have been successfully synthesized in situ without any capping agent in a Zn(II)-based low-molecular-weight metallohydrogel (ZAVA). Pristine ZAVA hydrogel shows blue luminescence, but the emission can be tuned upon encapsulation of the CdS quantum dots. Time-dependent tunable emission (white to yellow to orange) of the CdS incubated gel (CdS@ZAVA gel) can be attributed to sluggish growth of the quantum dots inside the gel matrix. Once CdS quantum dots are entrapped, their augmentation can be stopped by converting the gel into xerogel, wherein the quantum dots remains embedded in the solid xerogel matrix. Similar size stabilization of CdS quantum dots can be achieved by means of a unique room-temperature conversion of the CdS incubated ZAVA gel to CdS incubated MOF (CdS@ZAVCl) crystals. This in turn arrests the tunability in emission owing to the restriction in the growth of CdS quantum dots inside xerogel and MOF. These CdS embedded MOFs have been utilized as a catalyst for water splitting under visible light.

1 aSaha, Subhadeep1 aDas, Gobinda1 aThote, Jayshri1 aBanerjee, Rahul uhttp://library.ncl.res.in/content/photocatalytic-metal-organic-framework-cds-quantum-dot-incubated-luminescent-001914nas a2200241 4500008004100000022001400041245007500055210006900130260011000199300001400309490000600323520105000329100001701379700002301396700002401419700001801443700002001461700002601481700001801507700001901525700002001544856010801564 2015 eng d a2041-652000aChemical sensing in two dimensional porous covalent organic nanosheets0 aChemical sensing in two dimensional porous covalent organic nano aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcAPR a3931-39390 v63 a

Two new imide-based crystalline, porous, and chemically stable covalent organic frameworks (COFs) (TpBDH and TfpBDH) have been successfully synthesized employing solvothermal crystallization route. Furthermore, thin layered covalent organic nanosheets (CONs) were derived from these bulk COFs by the simple liquid phase exfoliation method. These 2D CONs showcase increased luminescence intensity compared to their bulk counterparts (COFs). Notably, TfpBDH-CONs showcase good selectivity and prominent, direct visual detection towards different nitroaromatic analytes over TpBDH-CONs. Quite interestingly, TfpBDH-CONs exhibit a superior ``turn-on'' detection capability for 2,4,6-trinitrophenol (TNP) in the solid state, but conversely, they also show a ``turn-off'' detection in the dispersion state. These findings describe a new approach towards developing an efficient, promising fluorescence chemosensor material for both visual and spectroscopic detection of nitroaromatic compounds with very low [10(-5) (M)] analyte concentrations.

1 aDas, Gobinda1 aBiswal, Bishnu, P.1 aKandambeth, Sharath1 aVenkatesh, V.1 aKaur, Gagandeep1 aAddicoat, Matthew, A.1 aHeine, Thomas1 aVerma, Sandeep1 aBanerjee, Rahul uhttp://library.ncl.res.in/content/chemical-sensing-two-dimensional-porous-covalent-organic-nanosheets-002441nas a2200277 4500008004100000022001400041245010600055210006900161260010600230300001200336490000800348520141600356653003001772653001701802653001401819653001601833653002201849100002401871700003001895700001701925700002901942700002101971700002001992700002402012856012702036 2016 eng d a0277-538700aPhotoluminescent tetrahedral d(10)-metal Schiff base complexes exhibiting highly ordered mesomorphism0 aPhotoluminescent tetrahedral d10metal Schiff base complexes exhi aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcFEB a150-1580 v1053 a

A series of four-coordinate d(10)-metal complexes of the type [ML2] {M = Zn, Cd, Hg; L = 4-nitro-2-((octadecylimino)methyl)phenol}, incorporating a new N-alkylated bidentate [N,O]-donor salicylaldimine Schiff base ligand, has been synthesized and characterized by elemental analyses, FT-IR, UV-Vis, H-1 NMR and FAB-mass spectroscopies. The ligand is non-mesomorphic and devoid of any photoluminescence. The zinc(II) and cadmium(II) complexes displayed highly ordered mesophases reminiscent of soft crystals. The phases have been characterized by polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and powder X-ray diffraction (PXRD) studies. The complex of mercury(II) decomposed prior to melting. An orthogonal symmetry with a `herringbone' array for the zinc complex and a primitive triclinic symmetry (p(1)) for the cadmium complex, respectively, has been proposed. The complexes exhibited fluorescence at room temperature, both in the solution and in the solid state, with emission maxima in the blue region. Density functional theory (DFT) calculations carried out using the GAUSSIAN 09 program at the B3LYP level revealed a distorted tetrahedral geometry around the metal center in all the complexes. Natural bond orbital (NBO) analysis suggested appreciable charge transfer from the ligand to the metal center in the complexes. (C) 2015 Elsevier Ltd. All rights reserved.

10aDensity functional theory10aLuminescence10aMesophase10aSchiff base10aX-ray diffraction1 aChakraborty, Sutapa1 aPurkayastha, Debraj, Dhar1 aDas, Gobinda1 aBhattacharjee, Chira, R.1 aMondal, Paritosh1 aPrasad, Krishna1 aRao, D., S. Shankar uhttp://library.ncl.res.in/content/photoluminescent-tetrahedral-d10-metal-schiff-base-complexes-exhibiting-highly-ordered-1