Dual Activation of H₂ and CO₂ by a Pincer-Type Ni-Zn Heterobimetallic Complex.

Authors

Krishnendu Dey, Matthias Borowski, Gregor Schnakenburg, Connie C Lu

Published in

Angewandte Chemie (International ed. in English). Pages e9254970. Jun 20, 2026. Epub Jun 20, 2026.

Abstract

Various Ni-based metalloenzymes employ synergistic heterometallic cooperativity where a Ni center and a second metal ion cofacilitate small-molecule conversion. Inspired by these biological systems, synthetic model complexes have been developed that exploit bimetallic cooperativity to achieve analogous reactivity. In this work, we report a bimetallic Ni-Zn complex comprising a pincer-type diamido-diaminodiphosphine ligand, in which a weakly Lewis acidic Zn(II) center stabilizes a T-shaped Ni(0) site. Subsequent reactivity with H₂ led to the isolation of a rare Ni dihydride complex, which dynamically interconverts between Zn(μ-H)Ni(H) and trans-Ni(H)₂ motifs via rotational rocking about the P-Ni-P axis. The Ni dihydride complex is a competent alkene hydrogenation catalyst (5 mol% loading, 70°C, 2 bar H₂) for terminal olefins. Also, the Ni dihydride inserts CO₂ to give a rare Ni hydrido formate. This product further reacts with a second equivalent of CO₂ through a carboxylate shift mechanism that unveils a nucleophilic Zn(II) amide group that inserts CO₂ to give carbamate. Collectively, our experimental and computational results highlight the role of Zn(II) as a weakly Lewis acidic partner, which promotes the dual activation of H₂ and CO₂ by a single Ni center in the absence of any external base.

PMID:
42322144
Bibliographic data and abstract were imported from PubMed on 20 Jun 2026.

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