Photolysis mechanism of Di(tert-butylphenyl)iodonium salt using 2-isopropylthioxanthone as a sensitizer

Applied Research Pub Date : 2023-12-23 DOI:10.1002/appl.202300096

Mayu Masuda, Atsushi Shiraishi, Ayumi Kobayashi, Kohei Iritani, Takashi Yamashita

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Abstract

Diaryliodonium salts (Ar₂I⁺X⁻) are used as a photosensitive initiator that generates acid or radical species by ultraviolet light irradiation. Recently, sensitization of Ar₂I⁺X⁻ has gained importance owing to the escalating demand for high-sensitive initiators with longer wavelength absorption such as 365 and 436 nm. However, the mechanism of photolysis of Ar₂I⁺X⁻ has not been strictly elucidated. This paper shows discussions of the details of its mechanism. Herein, we analyzed the photosensitization of Ar₂I⁺X⁻ with 2–isopropylthioxanthone (ITX) based on transient absorption techniques. As a result, it was revealed that electron transfer occurred from a triplet excited state of ITX to Ar₂I⁺X⁻ with an electron transfer rate constant of 4.2 × 10⁹ s⁻¹. Furthermore, high performance liquid chromatography measurements found the quantum yield of the photolysis was determined to be 0.48.

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以 2-异丙基硫酮为敏化剂的二(叔丁基苯基)碘盐的光解机制

二碘化铵盐（Ar2I+X-）可用作光敏引发剂，通过紫外线照射产生酸或自由基。最近，由于对具有较长吸收波长（如 365 和 436 纳米）的高灵敏度引发剂的需求不断增加，Ar2I+X- 的敏化作用变得越来越重要。然而，Ar2I+X- 的光解机理尚未得到严格阐明。本文对其机理的细节进行了讨论。本文基于瞬态吸收技术，分析了 2-isopropylthioxanthone (ITX) 对 Ar2I+X- 的光敏化作用。结果表明，电子从 ITX 的三重激发态转移到 Ar2I+X-，电子转移速率常数为 4.2 × 109 s-1。此外，HPLC 测量发现光解的量子产率为 0.48。本文受版权保护。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Research

CiteScore

0.70

自引率

0.00%

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