Jiang Zonghui, Liao Dai-Zheng, Hao Song-Qi
1991
Citations
0
Influential Citations
4
Citations
Journal
Polyhedron
Abstract
Abstract A new dinuclear copper(II) complex with the macrocyclic ligand (1,13-dioxa-4,7,10,16,19,22-hexaazacyclotetracosane), [24]-N6O2, has been prepared and its crystal structure has been determined. The two copper ions are contained inside the molecular cavity and are bound to the NNN chelating subunits situated at the two poles of the macrocycles. Each copper(II) centre displays square-pyramidal coordination. The CuIICuII distance is 5.16 A, and the macrocycle has an S-type conformation. The molecule has a symmetry centre. The temperature dependence of the magnetic susceptibility for the title complex was studied in the range 4-300 K, giving an exchange integral of J = 19.1 cm−1. This indicates a ferromagnetic interaction between the metal ions. The ESR spectra are also discussed.