01741nas a2200169 4500008004100000022001400041245012100055210006900176260007100245300001400316490000600330520103000336100002501366700002501391700002601416856012901442 2008 eng d a1528-748300aHydrogen bonding-directed metallosupramolecular structural motifs based on a peripheral urea fused bipyridine tecton0 aHydrogen bondingdirected metallosupramolecular structural motifs a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJUN a1952-19600 v83 a

The potential of bipyridine glycoluril (BPG), a urea fused bipyridine, tecton to form metal-organic frameworks (MOFs) has been explored by structural characterization of BPG and its complexes [Ru(phen)(BPG)(2)]Cl(2) (1) and [Ru(BPG)(3)]Cl(2) (2). The single crystal X-ray structure of BPG reveals that the inherent H-bond donor (N-H) and acceptor groups (C=O) exhibit a potential to generate diverse supramolecular motifs depending on the stoichiometry of tectons. The single crystal X-ray analysis of the secondary building units 1 and 2 provide evidence for this hydrogen-bonding capacity which results in supramolecular self-assembled metal-organic frameworks (MOF) via C-H center dot center dot center dot Cl, C-H.center dot center dot center dot O, N-H center dot center dot center dot Cl, and N-H center dot center dot center dot O interactions with a cluster of water molecules and chlorine anions surrounding secondary building units in I and channels encapsulating mixed water-dimethylsulfoxide clusters in 2.

1 aDeshpande, Megha, S.1 aKumbhar, Avinash, S.1 aPuranik, Vedavati, G. uhttps://library.ncl.res.in/content/hydrogen-bonding-directed-metallosupramolecular-structural-motifs-based-peripheral-urea-001529nas a2200181 4500008004100000245005800041210005600099260000800155300001200163490000700175520095300182100002501135700002201160700002401182700002201206700002601228856009301254 2008 eng d00aTetranuclear manganese (III) salicylaldoxime ensemble0 aTetranuclear manganese III salicylaldoxime ensemble cOCT a735-7400 v193 aCrystal structure of {[Mn(salicylaldoximeH)(salicylaldoxime)](4)} center dot 3CHCl(3) 1 formed by the interaction of MnCl2 center dot 4H(2)O and salicylaldoxime in a 1:1 ratio is described. The compound crystallizes in the orthorhombic space group Pbca (No 61) with the lattice parameters; a = 27.769 (3), b = 22.672 (2), c = 21.650 (2) angstrom, V = 13630 (2) angstrom(3), Z = 8, R-1 = 0.0776, wR(2) = 0.2356, S = 1.164. The cluster with four Mn (III) centers formed by four terminal and four bridging salicylaldoxime ligands results in a central rotating wheel-like core with the Mn-Mn separation varying from 3.531 to 3.576 angstrom and with the diagonal distances being 4.156-4.165 angstrom. Four intramolecular H-bonds between a terminal oxime (NOH) group and the adjacent phenolate oxygen atom of another ligand stabilize the structure of the cluster. Spectral, magnetic, and cyclic voltammetry studies corroborate a stable Mn (III) tetramer.1 aKumbhar, Avinash, S.1 aMulay, Mahesh, P.1 aPadhye, Subhash, B.1 aTavale, Sudam, S.1 aPuranik, Vedavati, G. uhttps://library.ncl.res.in/content/tetranuclear-manganese-iii-salicylaldoxime-ensemble-000998nas a2200169 4500008004100000022001400041245008500055210006900140260007100209300001400280490000700294520033400301100002300635700002500658700002600683856011900709 2008 eng d a0022-326300aUnexpected metal-promoted transformation yields an anthrylmethyl spiroanthracene0 aUnexpected metalpromoted transformation yields an anthrylmethyl  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAY a3559-35610 v733 a

The isolation and characterization of an unusual spiroanthracene, from the reaction of bisdichlororuthenium(II)bi-pyridine dihydrate with 3-(9-anthrylmethyl)pentane-2,4-dione (AMPD), is reported. This metal-promoted formation of spiroanthracene has been obtained for the first time during the synthesis of metal complexes.

1 aKumbhar, Anupa, A.1 aKumbhar, Avinash, S.1 aPuranik, Vedavati, G. uhttps://library.ncl.res.in/content/unexpected-metal-promoted-transformation-yields-anthrylmethyl-spiroanthracene-001280nas a2200193 4500008004100000022001400041245011800055210006900173260011000242300001400352490000700366520048800373100002400861700002500885700002100910700002100931700002000952856011400972 2011 eng d a1466-803300aHydrogen bond directed honeycomb-like porous network structure of tris (bipyridyl-glycoluril)cobalt(III) chloride0 aHydrogen bond directed honeycomblike porous network structure of aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJUL a5289-52910 v133 a

The [Co(bpg)3]Cl-3 complex (1), where bpg = 4b, 5, 7, 7a-tetrahydro4b,7a-epiminomethan-oimino-6H-imidazo [4,5-f][1,10]-phenanthroline-6,13-dione has been synthesized and characterized by various spectroscopic techniques and single crystal X-ray diffraction. The combination of bipyridyl-glycoluril (bpg) ligands and cobalt ion self-organise to form a honeycomb-like porous network structure resulting in the formation of zeolite like channels which adsorb gases, is described.

1 aKawade, Vitthal, A.1 aKumbhar, Avinash, S.1 aErxleben, Andrea1 aPachfule, Pradip1 aBanerjee, Rahul uhttps://library.ncl.res.in/content/hydrogen-bond-directed-honeycomb-porous-network-structure-tris-bipyridyl-001721nas a2200205 4500008004100000245009500041210006900136260000800205300001400213490000700227520099200234100002501226700002401251700002501275700002401300700002101324700002601345700002401371856012001395 2017 eng d00aProton conduction in a hydrogen-bonded complex of copper(II)-bipyridine glycoluril nitrate0 aProton conduction in a hydrogenbonded complex of copperIIbipyrid cJUN a6968-69740 v463 aBipyridine glycoluril (BPG), a urea-fused bipyridine tecton, forms a square-pyramidal secondary building unit with copper(II) which further self-assembles to give a porous hydrogen-bonded complex. This complex displays a high proton conductivity of 4.45 x 10(-3) S cm(-1) at 90 degrees C and 95% relative humidity (RH). Chains consisting of coordinated water, solvent water and nitrate anions embedded in the complex are responsible for high proton conduction. The proton conduction pathway was corroborated by ab initio electronic structure calculations with molecular dynamics (MD) simulations using the Nudged Elastic Band (NEB) method. The theoretical activation energy estimated to be 0.18 eV is in close agreement with the experimental value of 0.15 eV which evidences a Grotthuss proton hopping mechanism. We thus demonstrate that the hydrogen-bonded complex encapsulating appropriate counter ions, coordinated water and solvent water molecules exhibts superprotonic conductivity.1 aTayade, Sakharam, B.1 aDhavale, Vishal, M.1 aKumbhar, Avinash, S.1 aKurungot, Sreekumar1 aLoennecke, Peter1 aHey-Hawkins, Evamarie1 aPujari, Bhalchandra uhttps://library.ncl.res.in/content/proton-conduction-hydrogen-bonded-complex-copperii-bipyridine-glycoluril-nitrate00611nas a2200157 4500008004100000245008600041210006900127260000800196300002800204490000800232100002400240700003200264700002100296700002500317856011100342 2018 eng d00aModern trends in inorganic chemistry: celebration of inorganic chemistry in India0 aModern trends in inorganic chemistry celebration of inorganic ch cJUL aArticle Number: UNSP 750 v1301 aChikkali, Samir, H.1 aAnand, Venkataramanarao, G.1 aSrinivas, Darbha1 aKumbhar, Avinash, S. uhttps://library.ncl.res.in/content/modern-trends-inorganic-chemistry-celebration-inorganic-chemistry-india02273nas a2200229 4500008004100000022001300041245012200054210006900176260000800245300001400253490000700267520144600274100002501720700002101745700002701766700002401793700002401817700002501841700002401866700002301890856013001913 2018 eng d a1466803300aWater mediated proton conductance in a hydrogen-bonded Ni(II)-bipyridine-glycoluril chloride self-assembled framework0 aWater mediated proton conductance in a hydrogenbonded NiIIbipyri cJAN a1094-11000 v203 a

Proton conducting properties have been investigated in a new Ni(II)-based hydrogen-bonded porous framework synthesized using a urea-fused bipyridine-glycoluril (BPG) tecton. This hydrogen-bonded self-assembled structure encapsulates water molecules in the channels with hydrogen-bonding networks which exhibits a significant temperature dependent proton conductance of 1.5 × 10−4 S cm−1 at 95 °C and 95% RH with a low activation energy (Ea) of 0.54 eV, implying a Grotthuss proton hopping mechanism mediated by hydrogen-bonded water molecules in the channels. In addition, this framework exhibited a very high water uptake under humid conditions. A continuous array of water molecules and chloride ions embedded in the highly hydrophilic porous channels of the hydrogen-bonded framework acts as the proton conducting medium.

 

 

1 aTayade, Sakharam, B.1 aBhat, Satish, S.1 aIllathvalappil, Rajith1 aDhavale, Vishal, M.1 aKawade, Vitthal, A.1 aKumbhar, Avinash, S.1 aKurungot, Sreekumar1 aNäther, Christian uhttps://library.ncl.res.in/content/water-mediated-proton-conductance-hydrogen-bonded-niii-bipyridine-glycoluril-chloride-self02899nas a2200205 4500008004100000245012800041210006900169260000800238300001600246490000700262520213600269100002502405700002702430700002302457700001802480700002402498700002402522700002502546856012202571 2019 eng d00aA copper(ii)-coordination polymer based on a sulfonic-carboxylic ligand exhibits high water-facilitated proton conductivity0 acopperiicoordination polymer based on a sulfoniccarboxylic ligan cAUG a11034-110440 v483 a

Proton conduction ability has been investigated in a new Cu(ii) based coordination polymer (CP), {[Cu-2(sba)(2)(bpg)(2)(H2O)(3)]center dot 5H(2)O}(n) (1), synthesized using the combination of 4-sulfobenzoic acid (4-Hsba) and bipyridine-glycoluril (BPG) ligands. Single crystal X-ray structure determination revealed that 1 features 1D porous channels encapsulating a continuous array of water molecules. Proton conductivity measurements reveal a high conductivity value of 0.94 x 10(-2) S cm(-1) at 80 degrees C and 95% RH. The activation energy (E-a) of 0.64 eV demonstrates that the solvate water, coordinated water and hydrophilic groups in the channels promote the mobility of protons in the framework. Water sorption measurements exhibited hysterical behaviour with a high uptake value of 379.07 cm(3) g(-1). Time-dependent measurements revealed that the proton conductivity is retained even after 12 h of measurements. The proton conduction mechanism was validated by ab initio electronic structure calculations using the Nudged Elastic Band (NEB) method with molecular dynamics (MD) simulation studies. The theoretical activation energy is calculated to be 0.54 eV which is in accordance with the experimental value.

1 aTayade, Sakharam, B.1 aIllathvalappil, Rajith1 aLapalikar, Vaidehi1 aMarkad, Datta1 aKurungot, Sreekumar1 aPujari, Bhatchandra1 aKumbhar, Avinash, S. uhttps://library.ncl.res.in/content/copperii-coordination-polymer-based-sulfonic-carboxylic-ligand-exhibits-high-water01220nas a2200301 4500008004100000022001400041245015700055210006900212260000800281300001100289490000800300520020800308653002300516653001700539653001700556653001600573653001400589100002100603700002500624700002300649700001700672700001900689700002100708700002600729700001700755700001700772856012900789 2020 eng d a0162-013400aTris-heteroleptic ruthenium(II) polypyridyl complexes: Synthesis, structural characterization, photophysical, electrochemistry and biological properties0 aTrisheteroleptic rutheniumII polypyridyl complexes Synthesis str cFEB a1109030 v2033 a

{Three water-soluble tris-heteroleptic ruthenium(II) polypyridyl complexes [Ru(bpy)(phen)(bpg)](2+) (1), [Ru (bpy)(dppz)(bpg)]2+ (2), and [Ru(phen)(dppz)(bpg)]2+ (3) (where bpy = 2,2'-bipyridine

10aCircular dichroism10aCytotoxicity10afluorescence10aPolypyridyl10aruthenium1 aBhat, Satish, S.1 aKumbhar, Avinash, S.1 aPurandare, Neeraja1 aKhan, Ayesha1 aGrampp, Gunter1 aLoennecke, Peter1 aHey-Hawkins, Evamarie1 aDixit, Ruchi1 aVanka, Kumar uhttps://library.ncl.res.in/content/tris-heteroleptic-rutheniumii-polypyridyl-complexes-synthesis-structural-characterization01724nas a2200253 4500008004100000022001400041245014200055210006900197260000800266300001100274490000800285520081900293653002201112653002301134653001501157653002201172653002801194100002701222700002301249700002201272700002401294700002501318856012701343 2026 eng d a0020-169300aProton conductivity in a copper(II) bipyridine glycoluril complex: the synergistic role of coordinated water and hydrogen-bonded networks0 aProton conductivity in a copperII bipyridine glycoluril complex  cMAY a1230630 v5943 a

A dinuclear complex of copper(II) and bipyridine glycoluril (BPG) ligand is synthesized, characterized, and structurally examined by single-crystal X-ray diffraction. The complex [Cu2(BPG)2(NO3)2(H2O)4](NO3)2 center dot 5H2O (complex (1)) further forms a supramolecular network sustained by H-bonds between NH/C=O of BPG, coordinated/free water molecules, and nitrate anions. The complex exhibits a proton conductivity of 5.99 x 10_ 3 S center dot cm_ 1 at 90 degrees C and 95 % relative humidity (RH) with activation energy value Ea 0.35 eV, suggesting the Grotthuss proton transport mechanism. This value is consistent with those reported for proton-conducting systems in which coordinated water molecules play a critical role in facilitating efficient proton hopping across hydrogen-bonded networks.

10aCoordinated water10aCopper(II) complex10aH -bonding10aproton conduction10aSupramolecular networks1 aKhatavkar, Medhavi, D.1 aPanday, Rishukumar1 aSingh, Mayank, U.1 aKurungot, Sreekumar1 aKumbhar, Avinash, S. uhttps://library.ncl.res.in/content/proton-conductivity-copperii-bipyridine-glycoluril-complex-synergistic-role-coordinated