The ligand [Cp2MoH2] in complexes with AgS bonds

The reaction of [Cp2MoH2] and AgBF4 with the dithio-ligands Na(S2CNR2) (R=Et, Ph), Na(S2CMe), NH4(S2P(OEt)2) and K(S2COiPr) gives the complexes [(Cp2MoH2AgS2CNR2)2] (R=Et 1, Ph 2), [(Cp2MoH2AgS2CMe)2] (3), [(Cp2MoH2AgS2P(OEt)2)2] (4) and [(Cp2MoH2AgS2COiPr)n] (6) with probably n=2, all with a [Cp2MoH2]:Ag:dithio-ligand stoichiometry of 1:1:1. 1–4 form dimers in which two dithio-ligands bridge two silver atoms. In 1 and 2 one sulphur atom is coordinated to one silver atom, whereas the other is coordinated to both silver atoms. In 3 and 4 each sulphur atom is bonded to one silver atom only. In 1–3 there is a silversilver bond. However, in 4 the Ag⋯Ag distance is too long for an AgAg bond. Crystallization of the compound 6 afforded a polymer [(Cp2MoH2Ag4(S2COiPr)4)n] (7) with a stoichiometry [Cp2MoH2]:Ag:dithio-ligand=1:4:4. The polymer forms sheets with rings surrounding a [Cp2MoH2] ligand bonded to one of the four silver atoms. The monomer [(Cp2MoH2)2AgS2COEt] (5) with a stoichiometry [Cp2MoH2]:Ag:dithio-ligand=2:1:1 was prepared by addition of Na(S2COEt) to [Cp2MoH2] and AgBF4. In 5 the xanthogenate ligand is bonded with both sulphur atoms to the silver atom. The compounds 1–6 were characterized analytically and spectroscopically. The structures of 1–5 and 7 were determined by single crystal X-ray analyses.