End-On Copper(I) Superoxo and Cu(II) Peroxo and Hydroperoxo Complexes Generated by Cryoreduction/Annealing and Characterized by EPR/ENDOR Spectroscopy.

ABSTRACT: In this report, we investigate the physical and chemical properties of monocopper Cu(I) superoxo and Cu(II) peroxo and hydroperoxo complexes. These are prepared by cryoreduction/annealing of the parent [LCu^I(O₂)]⁺ Cu(I) dioxygen adducts with the tripodal, N₄-coordinating, tetradentate ligands L = ^PVtmpa, ^DMMtmpa, TMG₃tren and are best described as [LCu^II(O₂^•-)]⁺ Cu(II) complexes that possess end-on (η¹-O₂^•-) superoxo coordination. Cryogenic γ-irradiation (77 K) of the EPR-silent parent complexes generates mobile electrons from the solvent that reduce the [LCu^II(O₂^•-)]⁺ within the frozen matrix,

SUBMITTER: Davydov R 

PROVIDER: S-EPMC8785356 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature