Synthesis and molecular structure of the trinuclear ruthenium cluster cations [H3Ru3(C6H6)(C6H2Me4)2(O)]+ and [H3Ru3{C6H5(CH2)2OH}(C6H2Me4)2(O)]+
摘要:
The trinuclear arene-ruthenium cluster cations [H3Ru3(C6H6)(C6H2Me4)(2)(O)](+) (2) and [H3Ru3{C6H5(CH2)(2)OH}(C6H2Me4)(2)(O)](+) (3) have been synthesised from the dinuclear precursor [H3Ru2(C6H2Me4)(2)](+) (1) and the mononuclear complexes [Ru(C6H6)(H2O)(3)](2+) and [Ru{C6H5(CH2)(2)OH}(H2O)(3)](2+), isolated and characterised as the tetrafluoroborate salts. Cations 2 and 3 are analogues of the cluster cation [H3Ru3(C6H6)(C6Me6)(2)(O)](+) which was found to catalyse the hydrogenation of benzene to give cyclohexane under biphasic conditions (supramolecular cluster catalysis'). The single-crystal X-ray structure analyses of 2 and 3 have been determined. Unlike [2][BF4](.)3H(2)O, [3][PF6](H2O)-H-. shows a dimeric structure in the solid state, thanks to hydrogen bonds between the hydroxo function of one molecule of 3, a water molecule and the oxo cap of an other molecule of 3. (C) 2003 Elsevier Science B.V. All rights reserved.