X-ray diffraction study of C-monosubstituted derivatives of o-carborane with trimethylsilyl and trimethylgermyl substituents

Abstract

1. The data of a detailed x-ray-diffraction study of 1-trimethylsilyl- and trimethyl-germyl-o-carboranes show that the Si-C and Ge-C bonds between the carborane ring and the substituent are larger than the bonds in the substituent itself, and CH3 groups have a screened orientation with respect to the unsubstituted C-atom of the o-carborane skeleton. 2. The electron-deficient carborane ring appreciably influences the geometrical parameters of the bond of the polyhedron C atom with substituents.