Change in the paramagnetic properties of Fe₃O₄ upon interaction with benzimidazole derivatives

Abstract

ESR spectroscope was used to study the interaction between magnetite particles and organic molecules in model systems and real luminescent magnetic powder compositions. Ferric compounds localized on the magnetite surface are very labile and the introduction of organic compounds such as 1,2-naphthoylene 1′,2′-benzimidazole or DMF leads to a change in their electronic structure and the geometry of the environment. The observed changes presumably result from a coordination interaction of Fe(III) sites with organic compounds in the mechanical mixture. The role of vibrational interactions of the dye molecules and the oxygen sublattice in Fe₃O₄ in these processes was discussed.