Coordination of 4-mercapto-1,2-dithiole-3-thione heterocycles to ruthenium(II) and molybdenum(VI) centres
摘要:
Deprotonation of 4-mercapto-1,2-dithiole-3-thiones with NEt3 followed by reaction with [Ru(H)(Cl)-(CO)(PPh3)(3)] affords virtually quantitative yields of turquoise [Ru(H)(RC3S4)(CO)(PPh3)(2)] (R = Ph, Mes) in which the heterocycle is bound as a bidentate uninegative ligand through the two exocyclic sulfur atoms. The presence of both possible isomers in each case is indicated by NMR spectroscopy. Reaction of the 4-mercapto-1,2-dithiole-3-thiones with [MoO2(acac)(2)] results in displacement of the acac ligands and formation of [MoO2(RC3S4)(2)]. The crystal structures of [Ru(H)(MesC(3)S(4))(CO)(PPh3)(2)] and [MoO2-(MesC(3)S(4))(2)] have been determined. (C) 2009 Elsevier B.V. All rights reserved.