1-D assembly of two metal complexes with aroylhydrazones and mono/bidentate heterocycles

Abstract

The two metal complexes, [NiL¹(Hdmpz)] (1) and [CuL²(bipy)] · DMF (2), with substituted aroylhydrazones and N-donor heterocycle (Hdmpz) or a bidentate N,N-donor heterocycle (bipy) have been synthesized and structurally characterized. In the crystal lattice, each square-pyramidal [NiL¹(Hdmpz)] unit of 1 is connected to one neighbor by π–π and C–H–π interactions and to the other by a pair of C–H–π interactions, forming a chain-like arrangement of complexes with successive short and long Ni ··· Ni distances. In 2, the two [CuL²(bipy)] molecules link through a pair of Cu ··· Br contacts, forming a pseudodimer with each copper(II) displaying an elongated octahedron when the Br ··· Cu interaction is included. Each pseudodimer is further linked to another dimer via a pair of reciprocal hydrogen bonds, leading to a ladder-like chain arrangement.

Keywords:

• Self-assembly
• Crystal structure
• Hydrazone
• Heterocycle

Acknowledgments

The authors appreciate the financial support from the Natural Science Foundation of Jiangsu Education Committee (08KJD150018) and the Natural Science Foundation of Xuzhou Normal University (07PYL05).