Discovery of Dichloro(benzene)ruthenium(II) dimer

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A series of heterodinuclear germanium-ruthenium complexes having sulfido/oxo bridges, Dmp(Dep)-Ge(mu-E1)(mu-E2) Ru(eta6-arene) (E1, E2 = S, O; arene -benzene, p-cymene; Dmp = 2,6-dimesitylphenyl, Dep = 2,6-diethylphenyl) were synthesized by the reaction of [Ru(eta6-arene)Cl2] 2 and the corresponding diarylgermanedichalcogenoles, Dmp(Dep)Ge(E1H)(E2H). The reaction with tertiary phosphines gave the corresponding adducts Dmp(Dep)Ge(mu-S)(mu-E)Ru(PR 3) (E = S, O; R = Ph, Et), in which the arene ligand on the ruthenium was replaced by a mesityl group of Dmp. When Dmp(Dep)Ge(mu-S) 2Ru(PPh3) was treated with the Bronsted acids H(OEt2)2BArF4 and HOTf, a sulfido bridge was protonated to afford [Dmp(Dep)Ge(mu-S)(mu-SH)Ru(PPh 3)]X (X = BArF4, OTf). Likewise, the methylation reaction with Me3OBF4 proceeded at a mu-S, generating [Dmp(Dep)Ge(mu-S)(mu-SMe)Ru(PPh3)](BF4). On the other hand, protonation of Dmp(Dep)Ge(mu-S)(mu-O)Ru(PPh3) gave a mu-OH complex, [Dmp(Dep)Ge(mu-S)(mu-OH)Ru-(PPh3)] +, while the analogous methylation afforded the cationic mu-SMe complex [Dmp(Dep)Ge(mu-SMe)-(mu-O)Ru(PPh3)]+.

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Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI