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Magnetic Properties and Moessbauer Spectra of Several Iron(III) Dicarboxylic Acid Complexes.
VERMONT UNIV BURLINGTON DEPT OF CHEMISTRY
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Polymeric iron III complexes of malonic, succinic, furmaric, and phthalic acids have been prepared and studied by variable-temperature 15-300 K magnetic susceptibility, 57Fe Mossbauer spectroscopy, and infrared spectroscopy. In addition, properties of ironIII acetate have been reinvestigated using these same techniques. The magnetic susceptibilities of these complexes have been described by a theoretical model which includes, in addition to intramodular exchange terms, a parameter describing intermolecular spin-exchange effects. As a consequence of this model it was not necessary to assume an isosceles triangular arrangement of the ironIII ions in these materials in order to explain the magnetic data. Thus, the inclusion of an intertrimer exchange parameter, which varies from 12.1 cm for the acetate complex to 111.7 cm for the o-phthalate complex allowed for a complete description of the temperature-dependence of the magnetic susceptibilty of these compounds. Mossbauer and infrared spectroscopic studies were utilized to ascertain the correctness of oxidation state and structural assignments. Author
APPROVED FOR PUBLIC RELEASE