Phosphinidene-Bridged MoMn Derivatives of the Thiophosphinidene Complex [Mo2Cp2(μ-κ2:κ1,η6-SPMes∗)(CO)2] (Mes∗ = 2,4,6-C6H2tBu3)

Abstract

The title complex (1) reacted with [Mn2(CO)10] under visible-UV irradiation (toluene solution and quartz glassware) to give a mixture of the phosphinidene complex [MnMoCp(μ- κ1:κ1,η6-PMes∗)(CO)4], the cluster [Mn2Mo2Cp2(μ- κ1:κ1,η6-PMes∗)(μ3-S)(CO)8], and the thiophosphinidene complex [MnMoCp(μ- κ2:κ1,η4-SPMes∗)(CO)5], in yields of ca. 60, 20, and 10% respectively (Mes∗ = 2,4,6-C6H2tBu3). The major product follows from formal replacement of the SMoCp(CO)2 fragment in 1 with a Mn(CO)4 fragment, and displayed multiple bonding to phosphorus (Mn-P = 2.1414(8) Å); the tetranuclear cluster results from formal insertion of a Mn2(CO)6 fragment in 1, with cleavage of P-S and P-Mo bonds, to render a μ3-S bridged Mn2Mo core bearing an exocyclic phosphinidene ligand involved in multiple bonding to one of the Mn atoms (Mn-P = 2.140(2) Å); the thiophosphinidene complex (Mn-P = 2.294(1) Å) formally results from addition of sulfur and carbon monoxide to the major MnMo product, a transformation which actually could be performed stepwise, via the MnMo thiophosphinidene complex [MnMoCp(μ- κ2:κ1,η6-SPMes∗)(CO)4]. When the photolysis of 1 and [Mn2(CO)10] was performed in tetrahydrofuran solution and using conventional glassware, then the V-shaped cluster [Mn2MoCp{μ- κ1:κ1:κ1,η5-P(C6H3tBu3)}(CO)8] was obtained selectively (Mo-Mn = 3.2910(5) Å, Mn-Mn = 2.9223(5) Å), which unexpectedly displays a cyclohexadienylidene-phosphinidene ligand resulting from H atom abstraction at the aryl ring of the precursor. Density functional theory calculations on the complexes [LnM(μ- κ1:κ1,η6-PMes∗)MoCp] (MLn = MoCp(CO)2, Mn(CO)4, Co(CO)3) revealed that the degree of delocalization of the metal-phosphorus π-bonding interaction over the Mo-P-M chain is significantly conditioned by the heterometal fragment MLn, it being increased in the order Mn ≤ Mo < Co.