Reversible homolytic activation of water via metal–ligand cooperativity in a T-shaped Ni( ii ) complex

Chang, Mu-Chieh; Jesse, Kate A.; Filatov, Alexander S.; Anderson, John S.

doi:10.1039/C8SC03719A

Title: Reversible homolytic activation of water via metal–ligand cooperativity in a T-shaped Ni( ii ) complex

Journal Article · Wed Jan 30 00:00:00 EST 2019 · Chemical Science

DOI:https://doi.org/10.1039/C8SC03719A· OSTI ID:1482849

Chang, Mu-Chieh ^[1]; Jesse, Kate A. ^[1]; Filatov, Alexander S. ^[1];

^[1]

Department of Chemistry, The University of Chicago, Chicago, USA

A T-shaped Ni(II) complex [^Tol,PhDHPy]Ni has been prepared and characterized. EPR spectra and DFT calculations of this complex suggest that the electronic structure is best described as a high-spin Ni(II) center antiferromagnetically coupled with a ligand-based radical. This complex reacts with water at room temperature to generate the dimeric complex [^Tol,PhDHPy]Ni(μ-OH)Ni[^Tol,PhDHPyH] which has been thoroughly characterized by SXRD, NMR, IR and deuterium-labeling experiments. Addition of simple ligands such as phosphines or pyridine displaces water and demonstrates the reversibility of water activation in this system. The water activation step has been examined by kinetic studies and DFT calculations which suggest an unusual homolytic reaction via a bimetallic mechanism. The ΔH^‡, ΔS^‡ and KIE (k_H/k_D) of the reaction are 5.5 kcal mol^–1, –23.8 cal mol^–1 K^–1, and 2.4(1), respectively. In addition to the reversibility of water addition, this system is capable of activating water towards net O-atom transfer to substrates such as aromatic C–H bonds and phosphines. This reactivity is facilitated by the ability of the dihydrazonopyrrole ligand to accept H-atoms and illustrates the utility of metal ligand cooperation in activating O–H bonds with high bond dissociation energies.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE Office of Science (SC); University of Chicago; National Science Foundation (NSF)

Grant/Contract Number:: DEAC02-06CH11357; AC02-06CH11357; NSF/CHE1346572; NSF/DMR-1531283

OSTI ID:: 1482849

Alternate ID(s):: OSTI ID: 1524660

Journal Information:: Chemical Science, Journal Name: Chemical Science Vol. 10 Journal Issue: 5; ISSN 2041-6520

Publisher:: Royal Society of Chemistry (RSC)Copyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 15 works

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