Roles of anions in the structural diversity of Cd(II) complexes based on a V-shaped triazole-carboxylate ligand: Synthesis, structure and photoluminescence properties

摘要

Five novel Cd(II) complexes, [Cd-2(3-tba)(4)(H2O)(4)]center dot 4H(2)O (1), [Cd(3-tba)Cl] (2), [Cd(3-tba)I] (3), [Cd-2(3-tba)(2)(SCN)(2)(H2O)(2)]center dot 2H(2)O (4), and [Cd-3(3-tba)(2)(SO4)(2)(H2O)(2)] (5), were synthesized under hydrothermal conditions by the reaction of different Cd(II) salts with a V-shaped, bifunctional triazole-carboxylate ligand 3-(4H-1,2,4-triazole-4-yl) benzoic acid (3-Htba). X-ray single crystal diffraction analyses for these complexes revealed that compounds 1 and 2 exhibit a binuclear motif and a 3D binodal (3,5)-connected fsf/polar network, respectively, whereas 3 and 4 show 2D layer structures with different topologies belonging to 4-connected sql and (3,4)-connected V2O5 net, respectively. Complex 5 exhibits a 3D (3,4,5)-connected network with the (4(2).6)(2)(4(2).8(3).10)(4(3).6(3))(2)(4(4).6(4).8(2))(2) Schlafli symbol. All the complexes were characterized using single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), IR spectroscopy and elemental analyses. In addition, the solid-state photoluminescence results for 1-5 were also investigated. (C) 2016 Elsevier B.V. All rights reserved.