Abstract
Nickel(II) and cobalt(II) complexes with the tetradentate ligand tris-(3,5-dimethyl-1-pyrazolylethyl)amine, MeTPyEA, have been prepared and characterized with the usual physicochemical methods. A case of distortional isomerism for the five-coordinate complex cation [NiBr(MeTPyEA)] + has been ascertained through X-ray analyses of the two compounds [NiBr(MeTPyEA)]BPh 4·C 2H 5OH and [NiBr(MeTPyEA)] BPh 4·(CH 3) 2CO. The two isomers have geometries approaching the ideal trigonal bi-pyramid and square pyramid, respectively. The structural rearrangements of the ligand framework occurring in these nickel complexes and in the four-coordinate [Co(MeTPyEA)](BPh 4) 2 complex are compared. Suggestions are proposed about the electronic factors which may determine the different coordination numbers, four, five, and six, within the series of 3d metal complexes with the ligand MeTPyEA.
Published Version
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