Electrochemistry of clusters. Part 4. Redox behaviour of tetrametallic clusters [M12M22(η5-C5H5)2(µ3-CO)2(µ-CO)4(PR3)2](M1= Pt or Pd; M2= Cr, Mo, or W; R = Me, Et, Bun, or Ph)

Abstract

Electrochemical characteristics of the planar tetrametallic clusters [ M¹₂M²₂(η⁵-C₅H₅)₂(µ₃-CO)₂(µ-CO)₄(PR₃)₂](M¹= Pt or Pd; M²= Cr, Mo, or W; R = Me, Et, Buⁿ, or Ph) have been determined in the non-aqueous solvents dimethylformamide and 1,2-dichloroethane. The clusters undergo a two-electron reduction and two distinct one-electron oxidations. The reduction and the second oxidation steps are followed by chemical decomposition. Major species resulting from the sequence of reduction and chemical steps have been identified.