Journal of the Chemical Society, Dalton Transactions p. 1031 - 1037 (1996)
Update date:2022-07-30
Topics:
Field, John S.
Haines, Raymond J.
Stewart, Mark W.
Woollam, Stephen F.
Treatment of the formally unsaturated species [Ru2(μsb-CO)2(CO) 2(μ-etipdp)2] [sb = semi-bridging, etipdp = (PriO)2PNEtP(OPri)2] with silver(I) salts such as AgSbF6 or AgBF4 in MeCN or PhCN led directly to the formation of the disolvated species [Ru2(CO)4(RCN)2(μ-etipdp)2]X 2 (R = Me or Ph; X = SbF6 or BF4), with no intermediates being detected. In contrast, as established spectroscopically, oxidation of this complex with silver(I) salts in very weakly co-ordinating solvents such as acetone or methanol afforded silver adducts of the parent species. Also, reaction with the electron acceptor tcnq (7,7,8,8-tetracyano-p-quinodimethane) in tetrahydrofuran (thf) gave the electron-transfer salt [Ru2(η1-tcnq)(CO)4(thf)(μ-etipdp) 2][tcnq], while with p-chloranil (tetrachloro-1,4-benzoquinone) produced [Ru2(μ-Cl)(CO)4(μ-etipdp)2][p-OC 6Cl4O]2 as a consequence of the benzoquinone functioning as a chlorinating agent as well as an electron acceptor. Cyclic voltammograms of [Ru2(μsb-CO)2(CO) 2(μ-etipdp)2] and [Ru2(CO)4(RCN)2(μ-etipdp) 2][SbF6]2 (R = Me or Ph) have been measured in both aceto- and benzo-nitrile and are readily interpreted in terms of the redox process [Ru2(μsb-CO)2(CO) 2(μ-etipdp)2] + 2RCN -2e?2e [Ru2(CO)4(RCN)2(μ-etipdp)2] 2+. The structure of the acetonitrile species [Ru2(CO)4(MeCN)2(μ-etipdp) 2][BF4]2·CH2Cl2 has been determined X-ray crystallographically.
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