The X-ray structures of a series of copper(II) complexes with tetradentate Schiff base ligands derived from salicylaldehyde and polymethylenediamines of varying chain length
作者:Lawrence C Nathan、Jessica E Koehne、Joshua M Gilmore、Kelly A Hannibal、William E Dewhirst、Tuyetha D Mai
DOI:10.1016/s0277-5387(03)00029-9
日期:2003.3
The structures of six N,N'-polymethylene-bis(salicylaldiminato)copper(II) Schiff base complexes with alkyl backbones ranging from two to eight carbons have been determined by X-ray crystallography. The complexes are monomeric when the alkyl chain length is relatively short (two, three, and four CH2 groups) but are dimers when the chain length becomes longer (five, six, and eight CH2 groups). There is a regular increase in the distortion about the copper center as the alkyl chain length approaches four and five carbons, followed by a decrease as the chains become longer. Previously noted trends in electronic spectral, magnetic susceptibility, and microwave dielectric loss data can be accounted for based on this structural information. (C) 2003 Elsevier Science Ltd. All rights reserved.