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Issue 10, 1981
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Redox behaviour of triangular platinum–cobalt clusters. Electrochemically induced generation of the tetranuclear cluster [Pt2Co2(µ-Co)3(CO)5(PPh3)2]

Paul Lemoine,  Alain Giraudeau,  Maurice Gross,  Robert Bender  and  Pierre Braunstein 

Abstract

The redox behaviour of two trimetallic platinum–cobalt clusters [PtCo2(µ-CO)(CO)6(dppe)](1)[dppe = 1,2-bis(diphenylphosphino)ethane] and [PtCo2(µ-CO)(CO)7(PPh3)](2) was studied on both solid and mercury electrodes in aprotic medium by polarography, cyclic voltammetry, and potentiostatic coulometry. The reduction of the two clusters occurs via a one-electron irreversible step which further results in the release of one [Co(CO)4]– anion per mol of cluster. The cluster [Pt2Co2(µ-CO)3(CO)5(PPh3)2](3) was isolated in good yield from the reduction of (2). Each of the clusters (1) and (2) undergoes two one-electron oxidation steps. The first oxidation step is reversible at high potential scans, whereas the second step leads to electrode passivation. The redox potentials corresponding to the studied reactions are compared with those previously obtained for the linear trimetallic complex [(OC)4Co(PtL2)Co(CO)4](4)(L =cyclo-CNC6H11).

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Article type: Paper
DOI: 10.1039/DT9810002059
Citation: J. Chem. Soc., Dalton Trans., 1981,0, 2059-2062
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    Redox behaviour of triangular platinum–cobalt clusters. Electrochemically induced generation of the tetranuclear cluster [Pt2Co2(µ-Co)3(CO)5(PPh3)2]

    P. Lemoine, A. Giraudeau, M. Gross, R. Bender and P. Braunstein, J. Chem. Soc., Dalton Trans., 1981, 0, 2059
    DOI: 10.1039/DT9810002059

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