VIBRATIONAL SPECTRA AND BONDING IN ISOSTRUCTURAL $X_{3}MM' (CO)_{4}$ METAL-METAL BONDED SYSTEMS
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Date
1973
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Publisher
Ohio State University
Abstract
The infrared and laser Raman spectra of the ions $Cl_{3}GeFe (CO)_{4}^{-}, Cl_{3}SnFe(CO)_{4}^{-},$ and $Br_{3}SnFe (CO)_{4}^{-}$ are reported, and 15 to 18 of the 20 observable fundamentals for each ion have been observed and assigned on the basis of $C_{3v}$ symmetry. Vibrational analyses of these spectra and those of the isostructural $X_{3}MCo(CO)_{4}$ molecules (M = Ge, Sn; X = Cl, Br, I) have been carried out with a uniform set of approximations, which lead to close ``calculated-observed” agreement while both holding the force fields for the $M^{\prime}(CO)_{4}$ moiety constant through the respective series and varying only the constants associated with the $MX_{3}$ moieties. In each of the three isoelectronic pairs between the two series, k(Fe-M) is in a range higher than that for the analogous k(Co-M). The range of approximations over which this result remains valid, and the nature of bonding implications which can be drawn from vibrational analysis of such organometallic compounds, are evaluated.
Description
Author Institution: Department of Chemistry, Brown University