Coordination polymers based on a flexible tripodal ligand and aromatic dicarboxylate anions: Syntheses, structures and fluorescent properties

Four novel coordination polymers, based on 1,3,5-tris(triazol-1-ylmethyl)-2,4,6-trimethylbenzene (TITMB), namely, {[Zn-3(TITMB)(2)(m-bdic)(2)(SO4)(H2O)(2)]center dot 2H(2)O}(n) (1), {[Zn-6(TTTMB)(4)(P-bdic)(6)(H2O)(12)]center dot H2O}(n) (2), {[Ni(TTTMB)(oba)]center dot 2H(2)O}(n) (3) and [Ni-3(TTTMB)(2)(p-bdic)(3)(H2O)(6)](n) (4) (m-H(2)bdic = 1,3-benzenedicarboxylic acid, p-H(2)bdic = 1,4-benzenedicarboxylic acid, H(2)oba = 4,4'-oxybis(benzoic acid)) have been synthesized by the reactions of TTTMB with Zn(II) salts and Ni(II) salts in the presence of different aromatic dicarboxylate anions under appropriate reaction conditions. The structure determination reveals that 1 is a very intricate 3D network with point symbol of (6(2).10)(3.6.7)(3(2).4.6(2).7)(3(2).4.10(2),11(2)12(3)), while 2 is a 1D chain with dinuclear Zn(II) units. Complex 3 exhibits a 2-fold interpenetrated architecture with point symbol of (4.6(6).8(3))(4.6(2)), while 4 presents a 1D zigzag chain with dinuclear Ni(II) units. Moreover, the investigation of photoluminescence properties of 1 and 2 reveals that they show different fluorescent behaviors. (C) 2012 Elsevier Ltd. All rights reserved.