02517nas a2200193   4500008004100000245018100041210006900222260000800291300001600299490000800315520173800323100002302061700002202084700001902106700002602125700002302151700001702174856013202191       2014                        eng d00aHydrogen bonding interaction between active methylene hydrogen atoms and an anion as a binding motif for anion recognition: experimental studies and theoretical rationalization0 aHydrogen bonding interaction between active methylene hydrogen a  cMAR  a2656–26660 v1183 a<p>Two new reagents, having similar spatial arrangements for hydrogen atoms of the active methylene functionalities, were synthesized and interactions of such reagents with different anionic analytes were studied using electronic spectroscopy as well as by using 1H and 31P NMR spectroscopic methods. Experimental studies revealed that these two reagents showed preference for binding to F– and OAc–. Detailed theoretical studies along with the above-mentioned spectroscopic studies were carried out to understand the contribution of the positively charged phosphonium ion, along with methylene functionality, in achieving the observed preference of these two receptors for binding to F– and OAc–. Observed differences in the binding affinities of these two reagents toward fluoride and acetate ions also reflected the role of acidity of such methylene hydrogen atoms in controlling the efficiencies of the hydrogen bonding in anion–Hmethylene interactions. Hydrogen bonding interactions at lower concentrations of these two anionic analytes and deprotonation equilibrium at higher concentration were observed with associated electronic spectral changes as well as visually detectable change in solution color, an observation that is generally common for other strong hydrogen bond donor functionalities like urea and thiourea. DFT calculations performed with the M06/6-31+G**//M05-2X/6-31G* level of theory showed that F– binds more strongly than OAc– with the reagent molecules. The deprotonation of methylene hydrogen atom of receptors with F– ion was observed computationally. The metal complex as reagent showed even stronger binding energies with these analytes, which corroborated the experimental results.</p>1 aAgarwalla, Hridesh1 aJana, Kalyanashis1 aMaity, Arunava1 aKesharwani, Manoj, K.1 aGanguly, Bishwajit1 aDas, Amitava  uhttps://library.ncl.res.in/content/hydrogen-bonding-interaction-between-active-methylene-hydrogen-atoms-and-anion-binding-motif01205nas a2200229   4500008004100000022001400041245012500055210006900180260011000249300001600359490000700375520028300382100002200665700002500687700002100712700001900733700002500752700002400777700002500801700002100826856012800847       2015                        eng d  a1359-734500aHighly emissive organic solids with remarkably broad color tunability based on N,C-chelate, four-coordinate organoborons0 aHighly emissive organic solids with remarkably broad color tunab  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcSEP  a16115-161180 v513 a<p>Molecular fluorophores based on N,C-chelate, four-coordinate organo-borons exhibit tunable solid-state emission colors that cover the whole visible region from blue to red. The emission color can be tuned through the substituents on either quinolines or the boron center.</p>1 aShaikh, Aslam, C.1 aRanade, Dnyanesh, S.1 aThorat, Shridhar1 aMaity, Arunava1 aKulkarni, Prasad, P.1 aGonnade, Rajesh, G.1 aMunshi, Parthapratim1 aPatil, Nitin, T.  uhttps://library.ncl.res.in/content/highly-emissive-organic-solids-remarkably-broad-color-tunability-based-nc-chelate-four-0