Singlet oxygen quantum yields determined by oxygen consumption
Singlet oxygen quantum yields determined by oxygen consumption
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DOI：
10.1016/j.jphotochem.2019.04.029
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发表时间：
2019-06-01
影响因子：
4.3
通讯作者：
McCormick, Theresa M.
中科院分区：
文献类型：
--
作者：
Lutkus, Luke, V;Rickenbach, Sam S.;McCormick, Theresa M.
从三重态光敏剂中定量单线态氧的产生通常需要光谱技术和特殊的化学陷阱。本文描述了一种测定光敏剂的单线态氧量子产率（phi（Delta））的新方法。该方法利用单线态氧与二甲基亚砜（DMSO）反应生成二甲基砜。反应速率通过由来自密封系统的顶部空间的氧气的消耗引起的压力降低来测量。发现压力下降速率与单重态氧量子产率直接相关。已知光敏剂（荧光素、曙红Y、曙红B、亚甲蓝和三（吡啶）钌（II））在DMSO中的phi（Delta）通过使用虎红作为相对标准品的压力降低速率测定。发现光敏剂在DMSO中的单线态氧量子产率与使用传统光谱方法确定的每种光敏剂的报道值一致。
Quantifying singlet oxygen production from triplet photosensitizers typically requires spectroscopic techniques and specialty chemical traps. Herein we describe a novel method for determining the singlet oxygen quantum yield (phi(Delta)) of photosensitizers. The method utilizes the reaction between singlet oxygen and dimethyl sulfoxide (DMSO) to produce dimethyl sulfone. The rate of the reaction is measured by the pressure decrease that results from the consumption of oxygen from the headspace of a sealed system. It was found that the rate of pressure decrease was directly related to the singlet oxygen quantum yield. The phi(Delta) from known photosensitizers: fluorescein, Eosin Y, Eosin B, methylene blue, and tris(bypridine)ruthenium (II) in DMSO were determined by the rate of pressure decrease using Rose Bengal as a relative standard. The singlet oxygen quantum yields of the photosensitizers in DMSO were found to be in agreement with the reported values for each photosensitizer determined using traditional spectroscopic methods.