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Issue 38, 2019
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Gauging stability and reactivity of carbonyl O-oxide Criegee intermediates

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Abstract

In this study, we evaluated the effect of substitution on the stability and reactivity of carbonyl O-oxide Criegee intermediates (CIs). In this regard, we computed a set of more than 50 carbonyl oxides at the CBS-QB3 level of theory and assessed their stability by means of an isodesmic reaction equation defining a carbonyl oxide stabilization energy (COSE). Almost all substituents are stabilizing and amino groups in particular leading to COSE values of almost 60 kcal mol−1. As opposed to π-donors, substituents with a strong σ-electron pull destabilize the C[double bond, length as m-dash]O–O group. Furthermore, we studied how the intrinsic stabilization of the Criegee intermediate is reflected in its C[double bond, length as m-dash]O and O–O bond lengths as well as the partial charges on the individual atoms of the carbonyl oxide moiety. As a potential measure for reactivity, we determined the adiabatic singlet–triplet energy gap of all carbonyl oxides. Amino substituted CIs exhibit high-lying triplet states and have relatively large barriers towards addition of water or the OH radical. However, the ΔES–T cannot serve as a rigorous measure for carbonyl oxide reactivity.

Graphical abstract: Gauging stability and reactivity of carbonyl O-oxide Criegee intermediates

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Article information


Submitted
05 Jul 2019
Accepted
13 Sep 2019
First published
13 Sep 2019

Phys. Chem. Chem. Phys., 2019,21, 21530-21540
Article type
Paper

Gauging stability and reactivity of carbonyl O-oxide Criegee intermediates

J. P. Wagner, Phys. Chem. Chem. Phys., 2019, 21, 21530
DOI: 10.1039/C9CP03790J

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