Iron complexes of N-substituted thiosalicylideneimines. Part 2. Magnetic and Mössbauer spectral studies of iron(II) complexes

A detailed variable-temperature study has been made of the magnetic susceptibilities and Mössbauer spectra of bis(thiosalicylaldehydato)iron(II), [Fe(tsal)2], NN′-ethylenebis(thiosalicylideneiminato)iron(II), [Fe(tsalen)], NN′-propane-1,3-diylbis(thiosalicylideneiminato)iron(II), [Fe(tsalpd)], and bis[N-(p-methoxyphenyl)thiosalicylideneiminato]iron(II), [Fe(mptsaln)2]. A variety of spin states and magnetic exchange effects are observed: [Fe(tsal)2], high spin S= 2, binuclear species with antiferromagnetic coupling; [Fe(tsalen)], intermediate spin S= 1, antiferromagnetic coupling, polymeric species: [Fe(tsalpd)], high spin S= 2, binuclear species with antiferromagnetic coupling; [Fe(mptsaln)2], high spin S= 2, with zero-field splitting.