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

Abstract

Five novel Cd(II) complexes, [Cd2(3-tba)4(H2O)4]·4H2O (1), [Cd(3-tba)Cl] (2), [Cd(3-tba)I] (3), [Cd2(3-tba)2(SCN)2(H2O)2]·2H2O (4), and [Cd3(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 (42·6)2(42·83·10)(43·63)2(44·64·82)2 Schläfli 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.