Complexation of Fe II and Fe III with azaheterocyclic ligands L (L = phen or bipy) were studied in the presence and in the absence of boron cluster anions [B n H n ] 2-(n = 10, 12). The reactions were carried out in air at room temperature in organic solvents and/or water. In all the solvents used, well known [FeL 3 ]An (An = 2Clor SO 4 2-) ferrous complexes were formed from Fe II salts. Composition of ferric complexes with L ligands depends on the nature of solvent: either * Dr. V. V. Avdeeva Fax: +7-495-954-12-79 E-Mail: avdeeva.varvara@mail.ru [a] N.