Metathetical reactions of carbonylate anions with dichlororuthenium complexes: Preparation and characterization of ruthenium—molybdenum and ruthenium—manganese complexes

Abstract

The possibility of making metal—metal bonded heterobimetallic species by metathesis of ruthenium dichlorides with anionic carbonylates is demonstrated by the isolation of MoRu(μ-Cl)(μ-CO)(CO) 2(PPh 3) 2(η-C 5H 5) ( 1) and MnRuCl(μ-CO) 2(CO) 3(μ-dppm) 2 ( 2), obtained by action of [Mo(CO) 3(η-C 5H 5] − on RuCl 2(PPh 3) 3 and of Mn(CO) 5 − on RuCl 2(dppm) 2, respectively. In contrast, reaction of Mn(CO) 5 − with RuCl 2(PMe 3) 4 yielded an ionic species 3 containing the diruthenium cation Ru 2Cl 3(PMe 3) 6 +. More interestingly, the action of Mn(CO) 5 − on RuCl 2(PPh 3) 3 resulted in the formation of the unexpected complex MnRu(μ-PPh 2)(CO) 6(PPh 3) 2 ( 4) in which the phosphido group PPh 2 bridges the two metals; this process is shown to involve a hydride intermediate, and elimination of a molecule of benzene, both identified in the reaction mixture.