Cadmium(II) Complexes with 2,2′-Dithiodibenzoate Ligand: Syntheses, Crystal Structures, and Emission Properties

Two new CdII complexes formulated as {[Cd3(L)4](H2O)(CH3OH)3(Hdmpy)2}∞ (1) and {[Cd2(L)2(phen)2(H2O)2]}∞ (2) were prepared by a slow diffusion method from mixtures of 2,2′‐dithiodibenzoic acid (H2L) and Cd(ClO4)2·6H2O in the presence or absence of auxiliary phen ligand (L = 2,2′‐dithiodibenzoate, Hdmpy = protonated 2,6‐dimethylpyridine, and phen = 1,10‐phenanthroline). Their structures were determined by single‐crystal X‐ray diffraction technique. Complex 1 possesses a three‐dimensional (3D) α‐Po‐related framework containing [Cd3(L)4]2– cluster units as secondary building block, with a 41263 topology symbol. Complex 2 takes a one‐dimensional (1D) helical chain structure that is further assembled into a two‐dimensional (2D) network by the co‐effects of the inter‐chain O–H···O and C–H···O hydrogen bonds as well as π···π stacking interactions. Complexes 1 and 2 are both photoluminescent active materials, and their emission properties are closely related to their intrinsic structure arrangements.