Di- and tetranulcear Ru-II complexes of phenylene-1,4-diaminotetra(phosphonite), p-C6H4[N{P(OC6H4OMe-o)(2)}(2)](2) and their catalytic investigation towards transfer hydrogenation reactions

摘要

The stoichiometric reaction of phenylene-1,4-diaminotetra(phosphonite), p-C6H4[N{P(OC6H4OMe-o)(2)}(2)]2 (P2N Phi NP2) (1) with [RuCl2(p-cymene)](2) in acetonitrile produces cis, cis-[{RuCl2(CH3CN)(2)}(2)(P2N Phi NP2)] (2), whereas the similar reaction of 1 with [RuCl2(p-cymene)](2) in THF medium affords a tri-chloro-bridged tetrametallic complex, [{(eta(6)-p-cymene)Ru-2(mu(2)-Cl)(3)Cl}(2)(P2N Phi NP2)] (3) irrespective of the stoichiometry and reaction conditions. The formation and structure of complexes 2 and 3 are assigned through various spectroscopic and micro analysis data. The molecular structure of 2 is confirmed by single crystal X-ray diffraction study. The catalytic activities of complexes 2 and 3 have been investigated in transfer hydrogenation reactions.