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Teoret. i eksperim. khimiya. 2004. Vol.40 No. 4. p. 209-214

Magnetic Properties of Trinuclear Complexes
[M3O(CH3COO)6(pz)3]+ (M - Fe, Cr; pz - Pirazine)


K. S. Gavrilenko, A. Addison*, L. Thompson**, V. V. Pavlishchuk

L. V. Pysarzhevsky Institute of Physical Chemistry, National Academy of Sciences of Ukraine
31 Prosp. Nauky, 03028 Kyiv, Ukraine. E-mail: shchuk@inphyschem-nas.kiev.ua

* Department of Chemistry, Drexel University
Philadelphia, PA 19104. E-mail: addisona@drexel.edu

** Department of Chemistry, Memorial University
St. John's, NFD Canada A 1B 3X7. E-mail: lthomp@mun.ca

The conditions of synthesis of new trinuclear carboxylates [M3O(CH3COO)6(pz)3]+ (M - Fe, Cr; pz - Pirazine) are found. Their composition is determined by elemental analysis, mass-spectrometry, IR and electronic spectroscopy. It is shown, that substitution of water molecules by pirazine leads to some in- crease in antiferromagnetic interaction between the metal ions of trinuclear cation. The spin frustration is found in the investigated complexes.

Key words trinuclear complexes, carboxylates, iron(III), chromium(III), magnetics, spin frustration.