Porphyrin metal complexes with a large dipole moment

Abstract

The new design of an electret material is proposed. The material is based on the intercalation of organometallic macromolecules with a large dipole moment into a polymer during its polymerization under the influence of a constant electric field. A number of porphyrin complexes of transition elements with an “apex” metal–oxygen bond were synthesized, more specifically, complexes with titanyl and vanadyl, as well as complexes with bismuth(III) iodide. They were characterized by a series of physical and chemical methods. The maximum values of the dipole moment were found for BiI-etioporphyrin II (6.47 D) and for BiI-5,10,15,20-tetrakis (pentafluorophenyl)porphyrin (3.87 D). The inclusion of bismuth(III) iodide porphyrin complexes gave polyvinyl acetate films. The dielectric properties of the latter were studied, and a pronounced electret effect was found.