The syntheses and structures of mixed-metal dichalcogen complexes [CpMn(CO)2]2(E2)Pt(PPh3)2

The oxidative substitution of diphenylacetylene from the Pt(0) complex (PPh3)2Pt(PhCCPh) by the dimanganese-dichalcogen fragment [CpMn(CO)2]2(E)2 (E = S, Cp = C5H5, C5H4Et (1); E = Se, Cp = C5H5) occurs without E–E bond rupture and allows the formation of the new mixed-metal complexes [CpMn(CO)2]2(E2)Pt(PPh3)2 (2–4 respectively). The analogous Te-containing cluster [CpMn(CO)2]2(Te2)Pt(PPh3)2 (5) was prepared in the transmetallation of [CpMn(CO)2]3(Te2) by (PPh3)2Pt(PhCCPh). The Mn–E and E–E distances in the structures of 1–5 are considerably shortened (Mn–S 2.25, Mn–Se 2.37, Mn–Te 2.53 Å). The IR spectra, cyclic voltammetry data and DFT calculations indicate increasing of electron density on the Mn atoms in 2–5.

The mixed-metal platinum–manganese complexes [CpMn(CO)2]2(E2)Pt(PPh3)2 were prepared by the reaction of the manganese dichalcogenide complexes [CpMn(CO)2]2(E)2 (E = S, Se) or [CpMn(CO)2]3(Te)2 with the platinum(0) complex (PPh3)2Pt(PhCCPh).Figure optionsDownload as PowerPoint slide