Exchangeable: The cluster [(iPr3P)Ni]5H6 (1; see picture) was prepared by the addition of hydrogen gas to the dinuclear dinitrogen complex [(iPr3P)2Ni]2(μ-N2). This unprecedented first-row transition-metal cluster is electron deficient and highly reactive. Complex 1 undergoes hydrogen/deuterium exchange in deuterated benzene at room-temperature with a half-life of 27 minutes.
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