Isolation and single Journal of Organometallic Chemistry |
Journal of Organometallic Chemistry, Volume 684, Issues 1-2, 1 November 2003, Pages 117-123 Ludovic Vieille-Petit, Bruno Therrien, Georg Süss-Fink, Thomas R. Ward Abstract The trinuclear arene-ruthenium cluster cations [H3Ru3{C6H5(CH2)nOH}(C6Me6)2(O)]+ (3: n=2, 4: n=3) have been synthesised from the dinuclear precursor [H3Ru2(C6Me6)2]+ and the mononuclear complexes [{C6H5(CH2)nOH}Ru(H2O)3]2+ in aqueous solution, isolated and characterised as the hexafluorophosphate or tetrafluoroborate salts. Both 3 and 4 are derivatives of the parent cluster cation [H3Ru3(C6H6)(C6Me6)2(O)]+ (1) which was found to catalyse the hydrogenation of benzene to give cyclohexane under biphasic conditions. The mechanism postulated for this catalytic reaction (‘supramolecular cluster catalysis’), involving the hydrophobic pocket spanned by the three arene ligands in 1, was based on the assumption that the substrate molecule benzene is hosted inside the hydrophobic pocket of the cluster molecule to form a catalyst–substrate host–guest complex in which the hydrogenation of the substrate takes place. With the analogous cluster cations 3 and 4, containing a (CH2)nOH side-arm (n=2, 3) as substituent at the benzene ligand, it was possible to isolate the cationic host–guest complexes as the hexafluorophosphate or tetrafluoroborate salts. The single-crystal X-ray structure analyses of [C6H6 |
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