Iron(III) complexes of the metalloligand [Pt2(μ-S)2(PPh3)4]

Reaction of [Pt2(μ-S)2(PPh3)4] with (NH4)2SO4·FeSO4·6H2O and 2 mol equivalents of picolinic acid (HPic) or 8-hydroxyquinoline (HQ) and trimethylamine base gives iron(III) adducts [Pt2(μ-S)2(PPh3)4FePic2]+ and [Pt2(μ-S)2(PPh3)4FeQ2]+, isolated as hexafluorophosphate salts; these complexes are the first isolated iron(III) derivatives of [Pt2(μ-S)2(PPh3)4]. The X-ray structure of [Pt2(μ-S)2(PPh3)4FePic2]PF6 shows the presence of a rare distorted trigonal prismatic coordination geometry while magnetic measurements confirm the presence of high-spin iron(III) centres in the complexes.