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1 Polish Journal of Chemistry

1 1998

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Complexes of iron(III) salen and saloph Schiff bases bridges by dicarboxylic acids

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Kopel P. , Sindelar Z. , Biler M. , Klicka R.

tom Vol. 72, nr 9

2060-2066

Six dinuclear Fe(III) complexes involving tetradentate Schiff bases N,N'-bis(salicylidene)ethylenediamine (salenH2) or bis(salicylidene)o-phenylenediamine (salophH2) with 2,6-pyridinedicarboxylic acid (2,6-dicarpyH2), thiodiglycolic acid (tdgaH2) or 3,3'-thiodipropionic acid (3,3'-tdpaH2) have been synthesized and characterized by elemental analysis, IR spectroscopy and conductivity measuremenys. The magnetic behavioral of all complexes has been studied between 77-298 K. The dicarboxylic acids form bridges between paramagmetic centers and weak antiferromagnetic intramolecular exchanges were found. Thus, the complexes can be characterized as high spin distorted octahedral iron(III), except for [{Fe(saloph)}2(2,6-dicarpy)], where S1 = S2 = 3/2 spin-exchange model complies best with experimental data and the iron(III) has probably aquare-pyramidal coordination mode. The HDW S1 = S2 = 5/2 spin-exchange model with (H = -2S1S2) was applied in the case of the other complexes. The antiferromagnetic coupling parameters J vary in the range of -1.06 to -5.87 cm(-1).