M. Kira et al., TETRAKIS(TRIALKYLSILYL)DIGERMENES - SALIENT EFFECTS OF TRIALKYLSILYL SUBSTITUENTS ON PLANARITY AROUND THE GE=GE BOND AND REMARKABLE THERMOCHROMISM, Organometallics, 15(18), 1996, pp. 3767-3769
X-ray structural analyses of tetrakis(trialkylsilyl)digermenes have sh
own that the trialkylsilyl substituents enforce near-planar geometry a
round the Ge=Ge bonds, in accordance with theoretical predictions. A r
emarkable temperature dependence of the W-vis spectra of tetrakis(trii
sopropylsilyl)digermene in solution was observed, suggesting an equili
brium between two different structures around the Ge=Ge bond.