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Additive-Free Formic Acid Dehydrogenation Catalyzed by a Cobalt Complex

Lentz Nicolas 1 Alicia Aloisi 1 Pierre Thuéry 1 Emmanuel Nicolas 1 Thibault Cantat 1 
1 LCMCE - Laboratoire de Chimie Moléculaire et de Catalyse pour l'Energie (ex LCCEF)
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Résumé : The reversible storage of hydrogen through the intermediate formation of Formic Acid (FA) is a promising solution to its safe transport and distribution. However, the common necessity of using bases or additives in the catalytic dehydrogenation of FA is a limitation. In this context, two new cobalt complexes (1 and 2) were synthesized with a pincer PP(NH)P ligand containing a phosphoramine moiety. Their reaction with an excess FA yields a cobalt(I)-hydride complex (3). We report here the unprecedented catalytic activity of 3 in the dehydrogenation of FA, with a turnover frequency (TOF) of 4000 h-1 and a turnover number (TON) of 454, without the need for bases or additives. A mechanistic study reveals that the ligand has a non-innocent behaviour due to intermolecular hydrogen bonding, which is influenced by the concentration of formic acid
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Submitted on : Tuesday, September 8, 2020 - 5:38:59 PM
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Lentz Nicolas, Alicia Aloisi, Pierre Thuéry, Emmanuel Nicolas, Thibault Cantat. Additive-Free Formic Acid Dehydrogenation Catalyzed by a Cobalt Complex. 2020. ⟨cea-02933763⟩



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