Chloro-bridged complexes of copper(II) and manganese(II) derived from unsymmetric bidentate ligands: synthesis, crystal structure and characterization

Abstract

Two new usymmetric bidentate Schiff-base ligands (2-pyridyl-2-furylmethyl)imine (L1) and (2-pyridyl-phenylmethyl)imine (L2) were prepared. The crystal structures of two chloro-bridged complexes [Cu₂(μ-Cl)₂(L1)₂Cl₂] (1) and [Mn (μ-Cl)₂(L2)] (2) derived from the each ligand have been confirmed by single-crystal X-ray diffraction analysis. The complexes were characterized by IR, elemental analysis and spectroscopic methods. In complex 1, the two copper atoms are five-coordinate involving a square-pyramidal geometry having a N₂Cl₃ donor set with the two chlorine atoms bridging the two copper atoms. In complex 2, the manganese atoms are both six-coordinate. In contrast to 1, all chlorine atoms in 2 are bridging chlorides and link adjacent manganese atoms together forming 1-D infinite chains.

Keywords:

• Chloro-bridged
• Crystal structure
• Bidentate Schiff-base ligand
• Copper(II) complex
• Manganese(II) complex

Acknowledgements

The authors thank the Program for Changjiang Scholars and Innovative Research Team in University, PCSIRT(IRT 0559), National Natural Science Foundation of China (No. 20371039), National Basic Research Program of China (the 973 Program, No. 2003CB214606), the Key Laboratory Research and Establish Program of Shaanxi Education Section, China (No. 03JS006), and the Special Foundation of Shaanxi Education Section (No. 04JK143) for their financial support of this work.