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(A) Proposed mode of H2 activation based on a frustrated Lewis pair mechanism involving transient deprotonation of the guanidinium side chain of a conserved arginine residue. Analogous mechanisms have been reported for H2 activation by [FeFe] hydrogenases (B) and enzyme-inspired Ni pincer complexes (C), both of which contain a pendant amine that acts as a base. (B) and (C) reproduced with permission from ref (55). Copyright 2013 Elsevier B.V.
