Synthesis, Crystal Structure, and Luminescent Properties of a Helical Complex [(CuL)_2.5(H₂O)_0.375] (H₂L = Benzil Bis[(5-bromo oxidobenzylidene)hydrazone])

Abstract

A new helical copper (II) complex [(CuL)_2.5(H₂O)_0.375] 1 (H₂L = benzil bis[(5-bromo oxidobenzylidene)hydrazone]) was synthesized and characterized by elemental analysis, IR spectra, UV-vis spectra, and single-crystal X-ray diffraction. Complex 1 exhibits a new single-stranded helix with the copper (II) atom having a four-coordination seesaw geometry. The cooperativity of intermolecular C−H···π interactions and C−H···O hydrogen bonds links the helices together to form a three-dimensional network structure. The thermogravimetric and luminescent properties in the solid state of complex 1 have been investigated.

Keywords:

• copper(II)
• crystal structure
• helical complex
• luminescent properties

Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 20701012), the Foundation of Henan Educational Committee of China (No. 2007150003 and 2008B150002), the Foundation for University Youth Key Teacher of Henan Province of China and Innovation Experiment Program for University Students of Henan University (No. 09NB021).