Infrared study of some specificities of the dπpπ interaction in organogermanium compounds |
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Authors: | AN Egorochkin SYa Khorshev J Satgé P Riviére J Barrau |
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Institution: | Institute of Chemistry, U.S.S.R. Academy of Sciences, Gorky U.S.S.R.;Université Paul Sabatier, Toulouse France |
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Abstract: | The analysis is presented for the frequencies of stretching modes ν(GeH) in the IR spectra of organogermanium compounds R2XGeH, RX2GeH, RXYGeH, X2YGeH and XYGeH2 (where R is a substituent which does not make a dπpπ bond with germanium, and X and Y are groups capable of dπpπ interaction with germanium). It is shown that ν(GeH) in these compounds is dependent on both the I effect of R, X and Y, and the dπpπ interaction in GeX and GeY bonds. If only one substituent capable of dπpπ interaction with germanium is present, the value of such an effect is determined by itsσoRconstant. However, when germanium is bound to several substituents capable of dπpπ interaction its magnitude depends on the effective charge at germanium which is determined by the inductive and mesomeric effects of X and Y. The data obtained are compared to the dependences observed in the IR spectra of similar organosilicon compounds. |
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Keywords: | Author to whom correspondence should be addressed |
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