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Photochemical free radical formation from aliphatic dicarboxylic acids in solution as studied by electron spin resonance spectroscopy

✍ Scribed by Lotty Wymann; Tony Kaiser; Henning Paul; Hanns Fischer

Publisher: John Wiley and Sons
Year: 1981
Tongue: German
Weight: 676 KB
Volume: 64
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.19810640604

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✦ Synopsis

Abstract

Various free radicals formed during UV.‐irradiation of aliphatic dicarboxylic acids in aqueous and methanolic solution are identified by ESR.‐spectroscopy. Their structures point to α‐cleavage and photoreduction as the dominant primary photochemical decay processes. The relative contributions of these reactions to the overall photodecomposition depend on solvent and degree of α‐alkylation of the acid. Emission ESR.‐spectra are found for radicals formed by C, CO‐bond cleavage of α‐dimethyl substituted acids. The polarization is referred to the triplet mechanism of CIDEP. and indicates this cleavage reaction occurs from a triplet molecular state.

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Free Radical Formation from Excited Stat

Free Radical Formation from Excited States of Aliphatic Carboxylic Acids and esters in solution as studied by electron spin resonance

✍ Tony Kaiser; Loris Grossi; Hanns Fischer 📂 Article 📅 1978 🏛 John Wiley and Sons 🌐 German ⚖ 547 KB

## Abstract During UV.‐irradiation of aliphatic carboxylic acids and esters in aqueous and nonaqueous solutions various alkyl and acyl type radicals derived from parent compounds and solvents have been observed by ESR.‐spectroscopy. The structures of the radicals point to α‐cleavage, β‐dehalogenati