Exploring the limits of catalytic ammonia-borane dehydrogenation using a bis(N -heterocyclic carbene) iridium(III) complex

Nelson, David J. and Truscott, Byron and Egbert, Jonathan D. and Nolan, Steven P. (2013) Exploring the limits of catalytic ammonia-borane dehydrogenation using a bis(N -heterocyclic carbene) iridium(III) complex. Organometallics, 32 (13). pp. 3769-3772. ISSN 0276-7333

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Abstract

Ammonia borane dehydrogenation can be catalyzed by a number of organometallic species. [Ir(κ2-ItBu) 2][PF6] (ItBu = 1,3-bis(tert-butyl)imidazol-2- ylidene) is the most active catalyst for this process that has been reported to date. We explore herein the absolute limits of the use of this and related complexes, including [Ir(κ2-ItBu) 2][BArF4], [Ir(H)2(I tBu)2][BArF4], and [Ir(κ2-ItBu)2(NH3)][BAr F4] (BArF4 = tetrakis(3,5- bis(trifluoromethyl)phenyl)borate).