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((S2COPr)-Pr-t) gives the comple xes [(Cp2MoH2AgS2CNR2)(2)] (R = Et 1, Ph 2), [(Cp2MoH2AgS2CMe)(2)] (3), [(C p2MoH2AgS2P-(OEt)(2))(2)] (4) and [((Cp2MoH2AgS2COPr)-Pr-i)(n)] (6) with pr obably 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 sliver atoms. In 3 and 4 each sulphur atom is bonde d to one silver atom only. In 1-3 there is a silver-silver bond. However, i n 4 the Ag...Ag distance is too long for an Ag-Ag bend. Crystallization of the compound 6 afforded a polymer [(Cp2MoH2Ag4((S2COPr)-Pr-i)(4))(n)] (7) w ith a stoichiometry [Cp2MoH2]:Ag:dithio-ligand = 1:4:4. The polymer forms s heets with rings surrounding a [Cp2MoH2] ligand bonded to one of the four s ilver atoms. The monomer [(Cp2MoH2)AgS2COEt] (5) with a stoichiometry [Cp2M oH2]:Ag:dithio-ligand = 2:1:1 was prepared by addition of Na(S2COEt) to [Cp 2MoH2] 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 sing le crystal X-ray analyses. (C) 2000 Published by Elsevier Science S.A. All rights reserved.