Activation of Water, Ammonia, and Other Small Molecules
by PC<sub>carbene</sub>P Nickel Pincer Complexes
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Abstract
Nickel
complexes of a PC<sub>carbene</sub>P pincer ligand framework
are described. Dehydrobromination of the precursor (PC<sub>sp<sup>3</sup></sub>P)NiBr in the presence of a donor (PPh<sub>3</sub> or
NC<sup>t</sup>Bu) leads to the title complexes, which feature a rare
nickel–carbene linkage as the pincer ligand anchor point. This
strongly donating, nucleophilic carbene center engages in a variety
of E–H bond activations (E = H, C, N, O), some of which are
reversible. This represents a new mode of bond activation by ligand
cooperativity in nickel pincer complexes