Distribution of valence electron density in frame-type polyhedral CnHm and BnHm molecules and orbital excess bonds

Results of quantum-chemical studies of spatial distribution of valency electrons charge density in molecular structure of three-dimensional frame-type and polyhedral hydrogen-containing molecules CnHm and BnHm are presented. On the basis of ab initio calculations molecular ion B10H102- and radical cation BC9H12+ were studied, as well. It was ascertained that additional orbital interactions (orbital-excess bonds) are the reason of the observed distribution of valency electron density in the compounds studied at the expense of vacant valency orbitals of C+ or B atoms