Z. Naturforsch. 2012,
67b, 678 – 684
doi:10.5560/ZNB.2012-0083
Syntheses, Structures and Properties of Two Cd(II) Complexes Based on the 2-(1H-Imidazol-1-yl-methyl)-1H-benzimidazole Ligand
Xiao
Su,
Ting
Li,
Yu
Xiu, and
Xiangru
Meng
The College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450052, P. R. China
Reprint requests to Prof. Xiangru Meng. Fax: +86-0371-67783126. E-mail:
mxr@zzu.edu.cn
Received March 23, 2012 / published online July 18, 2012
Two new 1-D Cd(II) complexes, {[Cd(imb)(μ2-Cl)Cl]·CH3OH}n (1) and {[Cd(imb)(μ2-Cl)Cl]·DMF}n (2), have been synthesized by the reactions of the unsymmetrical ligand 2-(1H-imidazol-1-yl-methyl)-1H-benzimidazole (imb) with CdCl2 ·2.5H2O in methanol or methanol/DMF solution at room temperature, and structurally characterized by single-crystal X-ray diffraction. Complex 1 displays a ladder-shaped chain in which [Cd2Cl4] units are linked to each other through two bridging imb ligands. Complex 2 features an infinite looped chain structure composed of two kinds of rings, the
smaller [Cd2Cl2] ring and the larger [Cd2imb2] ring, connected alternately via their Cd(II) ions. The different architectures of complexes 1 and 2 can be generated by solvent exchange. The IR spectra and fluorescence properties of the complexes have been also investigated.
Key words: Cadmium Complex, 2-(1H-Imidazol-1-yl-methyl)-1H-benzimidazol, Crystal Structure, Fluorescence