Diverse coordinative functions of 4,4'-bipyridine generating abundant weak interactions and novel fluorescent property in cadmium(II)-4-sulfobenzoate polymer

摘要

The cadmium(11) 4-sulfobenzoate complex with 4,4'-bipyridine, {[Cd-2(4,4'-bipy)(4)(4-sb)(2)(H2O)(3)]center dot 4H(2)O}(n), has been synthesized and characterized by elemental analysis, IR, DTA-TG, fluorescence analysis, powder X-ray analysis, and single-crystal X-ray structural determination. Structural analysis showed that the complex contains two Cd atoms in an unsymmetrical unit. The Cd1 atom displays a seven-coordinated geometry, which is a capped anti-trigonal prismatic structure, whereas the Cd2 atom has an octahedral coordination. The 4,4'-bipyridine ligands in the complex have three coordination behaviors, i.e., monodentate, dimeric linker, and polymeric bridge, which is the first example showing three coordinative functions for 4,4'-bipyridine ligands in one complex. Moreover, three coordinative functions of 4,4'-bipyridine ligands in this polymer lead to abundant weak interactions and novel fluorescent properties, which is benefit for design and preparation of functional materials in specific usage.