Synthesis and characterization of the bimetallic series image

A series of thioheterobimetallic anions have been synthesized: [S2WS2Fe(NCS)X]2− (X = Cl− (1); X = NCS− (2); View the MathML sourceX=N3- (3)). The molecular dianions were isolated by substitution in [S2WS2FeCl2]2− of the labile terminal chloro ligands by NCS− and/or View the MathML sourceN3-. Anions (1) and (3) are the first iron tris-heteroleptic complexes of the well-known [S2WS2FeX2]2− (M = Mo, W) family. The structures of the three molecular anions, isolated as tetraphenylphosphonium salts, are reported, as well as characterization by IR, electronic and electrospray mass spectroscopies.