IRON MOLYBDENUM SULFUR AND IRON TUNGSTEN SULFUR COMPLEXES OF DIIMINES

The complexes FeLMS4 (L = bipy or phen; M = Mo or W) were prepared and characterized. The linearity of the chi(M)-1 vs T plot and Mossbauer spectral parameters (delta: 0.28 mm s-1; E(Q): 0.37 mm s-1) of [Fe(bip y)2MoS4] suggested that iron(II) assumes a distorted octahedral geomet ry with an intermediate spin state. The thiometallate acts as a bident ate chelating ligand towards iron(III), as evidenced by IR spectral re sults. An irreversible anodic wave observed at +1.04 V vs S.C.E. in th e cyclic voltammogram of [Fe(bipy)2MoS4] in DMSO suggested the oxidati on of iron(II) to iron(III) and the reduction of the bipyridyl ligand occurs at -1.40 V.