Infrared spectra and normal coordinate analysis of trinuclear μ3-oxoacetato complexes of chromium and iron

Abstract

The IR spectra of four μ3-oxo-acetato complexes of Cr (III) and Fe (EU) are reported in this paper. The assignments of v (Cr-L) are made empirically by comparing the IR spectra of serial compounds and experimentally by carrying out a variable-temperature experiment in situ. A simplified model was employed for the normal coordinate analysis of two homo-nuclear skeletons and their force constants have been calculated. In terms of the relationship between the IR spectra and their structure the rationality and reliability of the results are discussed. At the same time the assignments which are discordant in the references are checked by calculation and the more rational results have been obtained.