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The IR spectra of four u_3-oxo-acetato complexes of Cr(Ⅲ)and Fe(Ⅲ)are reportedin this paper.The assignments of v(Cr-L)are made empirically by comparing the IR spectra ofserial 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 andtheir force constants have been calculated.In terms of the relationship between the IR spectra andtheir structure the rationality and reliability of the results are discussed.At the same time the as-signments which are discordant in the references are checked by calculation and the more rationalresults have been obtained.
The IR spectra of four u_3-oxo-acetato complexes of Cr (III) and Fe (III) are reported in this paper. These 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 the force constants have been calculated. In terms of the relationship between the IR spectra and the structure of the rationality and reliability of the results are. discussed.At the same time the as-signments which are discordant in the references are checked by calculation and the more rational results have been obtained.