Syntheses and Characterizations of Two New Cadmium Complexes Based on Oxalate

摘要

Two new Cd(II) complexes, {[Cd(COO)(2)](2)2H(2)O}(n) (1) and {[CdCl(COO)(2)(Hbmi)]H2O}(n) (2), were obtained through the reactions of oxalic acid (H(2)ox) with CdCl(2)2.5H(2)O in the presence of 1-[(benzoimidazol-yl)methyl]-1H-tetrazole (bmt) or 1-[(benzoimidazol-yl)methyl]-1H-imidazol (bmi). Single-crystal X-ray diffraction shows that complex 1 has a 3-D structure with the topological notation of (4(8) . 6(2))(4(6) . 6(6) . 8(3))(4(2) . 8(4)), in which the oxalate displays two kinds of coordination modes: formation of the layers ((6)-ox) and linking the layers (mu(4)-ox). In complex 2, oxalates bridge Cd(II) ions, forming a 1-D chain, and (Hbmi)(+) cations coordinate to the Cd(II) ions in monodentate mode and hang at two sides of the main chain. This indicates that subtle modification of the N-donor ligands can result in complexes with different compositions and architectures. Moreover, their IR spectra, PXRD (powder X-ray diffraction) patterns, thermogravimetric analyses, and fluorescence properties are also investigated.