β-拉帕醌衍生的二苯基二氢二噁英的光物理和光化学：其阳离子自由基的产生与表征

Photophysics and photochemistry of the β-lapachone derived diphenyldihydrodioxin: generation and characterization of its cation radical.

作者信息

Netto-Ferreira José Carlos, Lhiaubet-Vallet Virginie, Bernardes Bauer, Ferreira Aurelio Baird Buarque, Miranda Miguel Ángel

机构信息

Departamento de Química - Universidade Federal Rural do Rio de Janeiro, Antiga Rio São Paulo, km 47, Seropédica 23970-000 RJ, Brazil.

出版信息

Photochem Photobiol Sci. 2014 Dec;13(12):1655-60. doi: 10.1039/c4pp00231h. Epub 2014 Sep 5.

DOI:10.1039/c4pp00231h

PMID:25190482

Abstract

The photophysics and photochemistry of the β-lapachone derived diphenyldihydrodioxin 3 were investigated using steady-state and time resolved techniques. Laser excitation of 3 leads to the formation of its cation radical 4 (absorption maxima at 410 and 450 nm and a lifetime of 10 μs), which was confirmed by its thermal generation employing tris(2,4-dibromophenyl)-aminium hexachloroantimonate (BAHA) as the electron acceptor. The cation radical 4 was also formed via the triplet excited state of 3 through a triplet sensitized process using benzophenone (ET = 69 kcal mol(-1)) as the sensitizer.

摘要

使用稳态和时间分辨技术研究了β-拉帕醌衍生的二苯基二氢二恶英3的光物理和光化学性质。对3进行激光激发会导致其阳离子自由基4的形成（吸收峰在410和450 nm处，寿命为10 μs），这通过使用三（2,4-二溴苯基）铵六氯锑酸盐（BAHA）作为电子受体对其进行热生成得以证实。阳离子自由基4也通过以二苯甲酮（ET = 69 kcal mol⁻¹）作为敏化剂的三重态敏化过程，经由3的三重激发态形成。