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Bimetallic System for Nitrogen Fixation: Ruthenium-Assisted Protonation of Coordinated N2 on Tungsten with H2

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Science  23 Jan 1998:
Vol. 279, Issue 5350, pp. 540-542
DOI: 10.1126/science.279.5350.540

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Abstract

Treatment of the tungsten dinitrogen complexcis-[W(N2)2(PMe2Ph)4] (Me = methyl, Ph = phenyl) with an equilibrium mixture of [RuCl(dppp)2]X andtrans-[RuCl(η2-H2)(dppp)2]X [X = BF4, PF6, or OSO2CF3; dppp = 1,3-bis(diphenylphosphino)propane] under 1 atmosphere of dihydrogen at 55 degrees Celsius for 24 hours gave NH3 in moderate yield. The same reaction in the presence of acetone produced acetone azine in high yield. None of these reactions proceeded in the absence of dihydrogen.

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