Original scientific paper

Fourier Transform Infrared Study of Dichlorodioxochromium(VI), Dichlorodioxomolybdenum(VI) and Dichlorodioxotungsten(VI) Complexes with 2,2’-Bipyridine

Bojan Šoptrajanov ; Institut za hemija, PMF, Univerzitet »Sv. Kiril i Metodij«, P.O. Box 162, 91001 Skopje, Macedonia
Mira Trpkovska ; Institut za hemija, PMF, Univerzitet »Sv. Kiril i Metodij«, P.O. Box 162, 91001 Skopje, Macedonia
Ljupčo Pejov ; Institut za hemija, PMF, Univerzitet »Sv. Kiril i Metodij«, P.O. Box 162, 91001 Skopje, Macedonia

Abstract

The Fourier transform infrared spectra of the 2,2’-bipyridine complexes of dichlorodioxochromium(VI), dichlorodioxomolybdenum(VI) and dichlorodioxotungsten(VI) were studied in the 4000 to 400 cm–1 region. The assignment of the bands originating from vibrations mainly localized in the bipyridine ligand is relatively straightforward. The essentially pure MO₂ stretching vibrations give rise to very strong bands, the separation of which increases in the order Cr < Mo < W as a consequence of the greater sensitivity of the antisymmetric stretching O–M–O vibration to the changes in the mass of the M atoms. For this to be true, the symmetric stretching vibration should have a higher frequency than the antisymmetric one. The results of the preliminary ab initio HF SCF calculations on simple model structures are in line (at least qualitatively) with such a conclusion.

Keywords

FTIR spectra; ab initio HF SCF; (2,2’-bipyridine)dichlorodioxochromium(VI); (2,2’-bipyridine)dichlorodioxomolybdenum(VI); (2,2’-bipyridine)dichlorodioxotungsten(VI)

Hrčak ID:

132263

URI

https://hrcak.srce.hr/132263

Publication date:

1.9.1999.

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