Electronic and steric effects in coordination sphere of complexes

The review deals with A.Verner's coordination theory which is the basis for development of electron knowledge in chemistry and especially the theory of mutual effects of atoms in the molecular. Electron and steric coordination effects are discussed using metal (V, Ru, Zr, Hf) complexes with porphyrins and phthalocyanine, The paper emphusizes the importance of the problem of reaction center screening when studyng the reactors of formation and dissociation of coordination compounds