Activation of Nitrogen-Hydrogen Bonds of Ammonia Induced by Trinuclear Polyhydrido Clusters Containing Ruthenium and Osmium

摘要

The unique reactivity of metal cluster complex stemming from the synergetic effect of the metal centers attracts considerable attention. We have, thus far, reported the reactions of triruthenium clusters (Cp*Ru)3(μ-H)3(μ3-H)2 (1) (Cp* = η~5-C5Me5) and (Cp*Ru)3(μH)_6~+ (2) with hydradines and ammonia in connection with nitrogen fixation and molecular transform of ammonia. Complex 1 effectively activates the N-H bond of ammonia to yeild a μ3-imido complex (Cp*Ru)3(μ-H)3-(μ3-NH) (3) along with liberation of dihydrogen (eq .1).