Vibron theory of heteroligand molecules and complexes: stereochemistry and stability of isomers

Potential surfaces of heteroligand molecular MLn-kXY...Z systems are studied within the scope of the purturbation theory using for purturbation the sum of the operator of vibron (electron-oscillating) interaction and of repacement operator. Mutual effects of ligands in various types of complexes (in particular quasioctahedron, quasisquare σ-bonded complexes of tellurium aid transition metals) as well as relative stability of geometric isomers and the problem of distortion isomers are discussed on this basis using various experimental materials