Literature DB >> 31469942

Impact of Intramolecular Hydrogen Bonding on the Reactivity of Cupric Superoxide Complexes with O-H and C-H Substrates.

Daniel E Diaz1, David A Quist1, Austin E Herzog1, Andrew W Schaefer2, Ioannis Kipouros2, Mayukh Bhadra1, Edward I Solomon2, Kenneth D Karlin1.   

Abstract

The dioxygen reactivity of a series of TMPA-based copper(I) complexes (TMPA=tris(2-pyridylmethyl)amine), with and without secondary-coordination-sphere hydrogen-bonding moieties, was studied at -135 °C in 2-methyltetrahydrofuran (MeTHF). Kinetic stabilization of the H-bonded [( ( X 1 ) ( X 2 ) TMPA)CuII (O2 .- )]+ cupric superoxide species was achieved, and they were characterized by resonance Raman (rR) spectroscopy. The structures and physical properties of [( ( X 1 ) ( X 2 ) TMPA)CuII (N3 - )]+ azido analogues were compared, and the O2 .- reactivity of ligand-CuI complexes when an H-bonding moiety is replaced by a methyl group was contrasted. A drastic enhancement in the reactivity of the cupric superoxide towards phenolic substrates as well as oxidation of substrates possessing moderate C-H bond-dissociation energies is observed, correlating with the number and strength of the H-bonding groups.
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Entities:  

Keywords:  H-atom transfer; copper monooxygenases; cupric superoxide; dioxygen reduction; hydrogen bonding

Year:  2019        PMID： 31469942      PMCID： PMC6878127          DOI： 10.1002/anie.201908471

Source DB:  PubMed          Journal:  Angew Chem Int Ed Engl        ISSN： 1433-7851            Impact factor:   15.336


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