Quinone adducts of cobalt(II) and iron(II) complexes with a quadridentate Schiff's base
Abstract
The reactions of some p- and o-quinones with N,N′-ethylenebis(salicylideneiminato)cobalt(II), Co(salen), and N,N′-ethylenebis(salicylideneiminato)iron(II), Fe(salen), have been studied. A low-spin 2 : 1 adduct of the cobalt complex with p-benzoquinone was isolated in pyridine: its formula is [Co(salen)(py)]2C6H4O2 and a dimeric structure with a bridging quinone and six-co-ordinate cobalt(III) is proposed for it. The iron complex in tetrahydrofuran suspension yielded 2 : 1 adducts with p-quinones (p-benzoquinone, tetramethyl-p-benzoquinone, and tetrachloro-p-benzoquinone) of formula [Fe(salen)]2quinone: a dimeric structure with a bridging quinone is suggested for them mainly on the basis of magnetic properties. With o-quinones(9,10-phenanthrenequinone and 1,2-naphthoquinone), 1 : 1 adducts of formula Fe(salen)(quinone) were obtained.
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