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mer-[RuCl3(dmso)(tmen)] (dmso is dimethylsulfoxide; tmen is N,N,N‘,N‘-tetramethylethylenediamine) contains an S-bonded dmso with Ru−S = 2.29 Å. Electrochemical measurements show that there are two reversible one-electron couples (E1/2 = 1.78 and 0.11 V vs NHE), indicating that S-atom (dmso) ligation is retained in the corresponding Ru(II) and Ru(IV) complexes.
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Rack et al. (1998) studied this question.
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