Jide Xu, S. Ni, Yu-Juan Lin
Jan 2, 1986
Citations
0
Influential Citations
22
Citations
Journal
Inorganica Chimica Acta
Abstract
Abstract The synthesis and characterization of a new 14- membered tetraazamacrocylic ligand 5,5,7,12,12,14- hexamethyl-1,4,8,11-tetraazacyclotetradecane-N′,N‴- diacetic acid (H2L2) are reported. Cobalt(III),nickel(II) and copper(II) complexes with this ligand were prepared and their IR and visible spectra studied. The molecular structure of the complex NiL2· HBr·H2O was proved by single-crystal X-ray analysis. The compound crystallizes in the space group P21/n, with cell parameters a = 16.7109(13), b = 9.0539(9), c = 17.0277(13) A, β = 107.46(6)° and Z = 4. The structure was solved by direct and Fourier methods and refined by full matrix least square calculation to R = 0.042 for 4355 observed reflections (I > 3σ(I)). The complex shows a cis-octahedral geometry with the macrocycle coordinated in a folded configuration to four sites around the central nickel atom. The two carboxylate groups of the side chain are on the same side of the approximate plane of the macrocycle.