Substituent Effects in Linear Organogermanium Catenates

The trigermanes EtOCH2CH2Ge(R2)Ge(Ph2)Ge(R2)CH2CH2OEt (R = Et, Bu, Ph) and Ph3GeGe(Bu2)Ge(Ph2)CH2CH2OEt as well as the two tetragermanes Ph3GeGe(Bu2)Ge(Ph2)Ge(R2)CH2CH2OEt (R = Et, Bu) have been prepared and characterized. The absorption and electrochemical attributes of these species, along with th...

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Bibliographic Details
Published in:Organometallics 2008-08, Vol.27 (15), p.3753-3760
Main Authors: Amadoruge, Monika L, Gardinier, James R, Weinert, Charles S
Format: Article
Language:English
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Summary:The trigermanes EtOCH2CH2Ge(R2)Ge(Ph2)Ge(R2)CH2CH2OEt (R = Et, Bu, Ph) and Ph3GeGe(Bu2)Ge(Ph2)CH2CH2OEt as well as the two tetragermanes Ph3GeGe(Bu2)Ge(Ph2)Ge(R2)CH2CH2OEt (R = Et, Bu) have been prepared and characterized. The absorption and electrochemical attributes of these species, along with the butylated oligogermane series Ph3Ge(GeBu2) n CH2CH2OEt (n = 1−3) and the digermanes Ph3GeGeR3 (R = Et, Bu, Pri, Ph), have been investigated using UV/visible spectroscopy and cyclic voltammetry. In general, the position of the absorption maximum shifts to lower energy and the oxidation potential decreases with increasing chain length. Variation of the organic substituents at germanium was also found to have a measurable effect on these spectral and electrochemical features. The experimental results were correlated with the energies of the HOMO and LUMO in these molecules, which were determined by density functional theory (DFT) calculations.
ISSN:0276-7333
1520-6041
DOI:10.1021/om800240w