Oxo-bridged binuclear iron(III) complexes with NN′-bis(2-methylpyridyl)ethylenediamine and 2,2′ : 6′,2″ : 6″,2‴-tetrapyridyl
- 1 January 1976
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 16,p. 1543-1546
- https://doi.org/10.1039/dt9760001543
Abstract
Two oxo-bridged complexes of iron(III), having different configurations depending on the different conjugative capacity of the quadridentate nitrogen ligands used, have been isolated and characterized. They are formulated as cis-[{Fe(bmen)}2O(H2O)2][SO4]2·H2O and trans-[{Fe(tetpy)}2O][SO4]2·7H2O, in which pairs of iron(III) ions (S= 5/2) interact antiferromagnetically [bmen =NN′-bis(2-methylpyridyl)ethylenediamine and tetpy = 2,2′:6′,2″:6″,2‴-tetrapyridyl]. Evidence is produced that the dimeric form of both complexes also predominates in an aqueous medium. As the pH is increased, the stability between the oxo-bridged units of the two complexes in solution differs; this is briefly discussed in the light of the different stereochemical features of the molecu les.Keywords
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