Syntheses and crystal structures of nickel(II), copper(II), and zinc(II) complexes with a biphenyl-bridged bis(pyrrole-2-yl-methyleneamine) ligand

Abstract

The reactions of nickel(II), copper(II), and zinc(II) acetate salts with a potentially tetradentate biphenyl-bridged bis(pyrrole-2-yl-methyleneamine) ligand yielded three complexes with different coordination geometries. X-ray crystal structural analysis reveals that in the nickel(II) complex each nickel is five-coordinate, distorted trigonal bipyramid. In the copper(II) complex, each copper is four-coordinate, between square planar and tetrahedral. In the zinc(II) complex, each zinc is four-coordinate with a distorted tetrahedral geometry and the molar ratio of the zinc and ligand is 1 : 2.

Keywords:

• Nickel(II) complex
• Copper(II) complex
• Zinc(II) complex
• Biphenyl-bridged Schiff-base ligand

Acknowledgments

We sincerely express our thanks to the National Natural Science Foundation of China (Grant Nos. 20733007, 20573122 and 50221201) and the National Basic Research Program (2007CB808004) for financial support.