Cationic dinuclear arene ruthenium complexes with one hydroxo and two chloro bridges: synthesis and molecular structure of [(p-Me–C6H4–Pri)2Ru2(μ-Cl)2(μ-OH)][ReO4]

The dinuclear complexes (arene)2Ru2Cl4 (arene=benzene, p-cymene, durene, hexamethylbenzene) react in aqueous solution to give, in addition to the known cationic trichloro complexes [(arene)2Ru2(μ-Cl)3]+, the new dichloro hydroxo cations [(arene)2Ru2(μ-Cl)2(μ-OH)]+ which can be isolated as the perrhenate salts.