BIS(PHENOL) ADDUCT OF CP-STAR-RU(ETA-5-OXOCYCLOHEXADIENYL), A DOUBLY SYMMETRICAL HYDROGEN-BRIDGED RUTHENIUM COMPLEX

Reaction of [Cp*Ru(OMe)]2, Cp* = eta-5-C5Me5, (1) with phenol leads to the title complex Cp*Ru(C6H5 = O)...(H-OC6H5)2 (2) as an integral molecule in solution and in the solid state. The structure of 2 was elucidated by single-crystal X-ray analysis (orthorhombic space group Pbca, a = 14.306 (5), b = 21.240 (4), c = 16.326 (4), Z = 8) and consists of two phenols hydrogen bonded to an oxocyclohexadienyl unit complexed to Cp*Ru. The C-C- and C-O distances in the oxocyclohexadienyl part are close to the values typical for an aromatic eta-6-ligand. Similar pi-complexes are formed with 2-hydroxyacetophenone, salicylaldehyde, and 5-hydroxy-1,4-naphthoquinone.