Charging Ahead

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Science  16 Aug 2002:
Vol. 297, Issue 5584, pp. 1095
DOI: 10.1126/science.297.5584.1095c

Dithiolenes, which contain the -S-C=C-S- group, can form complexes with transition metals that display unusual magnetic or redox properties and can provide insights into the reactivity of metal-sulfur clusters in enzymes. Normally, if the complex has only dithiolene ligands, all of the potential sites for ligand binding are occupied: The compound is coordinately saturated.

Beswick et al. now report on the synthesis and characterization of an air-stable palladium-dithiolene complex in which six Pd-S2C2(COOCH3)2 units adopt a slightly distorted cube-octahedron structure. The Pd atoms occupy the center of the cube's faces and the S atoms occupy the midpoints of the edges, leaving the center of the cube and the opposite site on each Pd atom unoccupied. Cyclic voltammetry studies show that the neutral complex can be reduced reversibly to form the 4 anion. This stable unsaturated cluster should provide a useful starting point for the synthesis of related compounds. — PDS

J. Am. Chem. Soc. 10.1021/ja026079k (2002).

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