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Unveiling the Mechanism for the Photochemistry and Photodegradation of Vanillin
Photochemistry and Photobiology ( IF 2.6 ) Pub Date : 2021-09-27 , DOI: 10.1111/php.13520 Teresa A Gawargy 1 , Bowen Wang 1 , Juan C Scaiano 1
Photochemistry and Photobiology ( IF 2.6 ) Pub Date : 2021-09-27 , DOI: 10.1111/php.13520 Teresa A Gawargy 1 , Bowen Wang 1 , Juan C Scaiano 1
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The photolysis of vanillin produces a short-lived triplet state where its lifetime is controlled by efficient self-quenching (kSQ ~ 2 × 109 m−1 s−1) which also generates radicals. Free radical reactions, including vanillin dimer formation, are responsible for the degradation of vanillin and is accompanied by yellowing of the acetonitrile solutions. Laser flash photolysis studies reveal a triplet absorbing at 390 nm, readily quenched by naphthalenes, conjugated dienes and oxygen. Vanillin is also a good singlet oxygen sensitizer as revealed by its characteristic NIR emission at 1270 nm.
中文翻译：
揭示香兰素的光化学和光降解机制
香兰素的光解产生短寿命的三重态，其寿命由有效的自猝灭（k SQ ~ 2 × 10 9 m -1 s -1）控制，自猝灭也会产生自由基。自由基反应，包括香草醛二聚体的形成，是香草醛降解的原因，并伴随着乙腈溶液的泛黄。激光闪光光解研究揭示了在 390 nm 处吸收的三重态，很容易被萘、共轭二烯和氧气淬灭。香兰素也是一种良好的单线态氧敏化剂，其特征在于 1270 nm 的近红外发射。
更新日期：2021-09-27
中文翻译：
揭示香兰素的光化学和光降解机制
香兰素的光解产生短寿命的三重态，其寿命由有效的自猝灭（k SQ ~ 2 × 10 9 m -1 s -1）控制，自猝灭也会产生自由基。自由基反应，包括香草醛二聚体的形成，是香草醛降解的原因，并伴随着乙腈溶液的泛黄。激光闪光光解研究揭示了在 390 nm 处吸收的三重态，很容易被萘、共轭二烯和氧气淬灭。香兰素也是一种良好的单线态氧敏化剂，其特征在于 1270 nm 的近红外发射。
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