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The U(III) mixed-sandwich compound U(eta-Cp)(eta-C(8)H(4)[Si(i)Pr(3)-1,4(2))] 1 may be prepared by sequential reaction of UI(3) with KCp followed by K(2)C(8)H(4)[Si(i)Pr(3)-1,4(2)], and has been crystallographically characterized. 1 reacts reversibly with dinitrogen to afford dimeric [U(eta-Cp)(eta-C(8)H(4)[Si(i)Pr(3)-1,4(2))](2)(mu-eta(2):eta(2)-N(2))] 2, whose X-ray crystal structure reveals a sideways-bound, bridging diazenido (N(2)(2-)) ligand.
Cloke et al. (Fri,) studied this question.