2À (2-oxo-1,3-dithiole-4,5-dithiolate), and dsit 2À (2-thioxo-1,3-dithiole-4,5-diselenolate) as dithiolene ligand are oxidized to the six corresponding 1:1 charge-transfer salts with TCNQF 4
The synthesis and the electrochemical characterization of [(η 5 -C 5 Me 5 )Codddt] (dddt 2-) 5,6-dihydro-1,4-dithiine-2,3-dithiolate) (1) are described. The chemical oxidation of 1 by AgBF 4 leads to the formation of a bimetallic complex, [(η 5 -C 5 Me 5 )Codddt] 2 2+ (2), which has been characterized by X-ray crystallography. The 1 H NMR study reveals that 2 is diamagnetic, and this has been rationalized by extended Hu ¨ckel calculations. The addition of trimethyl phosphite on 2 gives the paramagnetic adduct [Cp*Co(dddt){P(OMe) 3 }] •+ (4). The dissociation of 2 has also been investigated electrochemically.
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