It has been established by means of elemental analysis, X-ray di †raction, IR and optical spectroscopies, cyclic voltammetry and EPR that, due to the nanostructure, the composites based on polyaniline (PAn) and on vanadium or iron oxides display consistent speciÐc spectral, electrochemical, magnetic properties which are associated with intermolecular interaction with charge transfer between conducting polymer and inorganic component of the composites and with formation of the united electronic system. The nanosized e †ects in both composites explored possess similarity as well as distinctions. While in the nanocomposite direct PAnÈV 2 O 5 interaction of the polyaniline macromolecules, intercalated in the galleries, with V5`ions takes place, V 2 O 5 resulting in charge transfer, the charge transfer between polyaniline and particles of the Fe 3 O 4 PAnÈFe 3 O 4 nanocomposite is motivated by the fact that during the synthesis of the composite the particles in the Fe 3O 4 starting sol and in the reaction medium carry a certain surface charge which they retain in the composite, thus acting as peculiar extra dopants for macromolecules of the conducting polymer.

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