Heteroatom substitution induced changes in excited-state photophysics and singlet oxygen generation in chalcogenoxanthylium dyes: Effect of sulfur and selenium substitutions
Heteroatom substitution induced changes in excited-state photophysics and singlet oxygen generation in chalcogenoxanthylium dyes: Effect of sulfur and selenium substitutions
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DOI：
10.1021/jp0370674
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发表时间：
2004-06-24
影响因子：
3.3
通讯作者：
Prasad, PN
中科院分区：
文献类型：
--
作者：
Ohulchanskyy, TY;Donnelly, DJ;Prasad, PN
研究了一系列黄嘌呤氧原子被硫或硒取代的四甲基玫瑰胺染料的光物理性质。含硫的染料，特别是含硒的染料，荧光量子产率和寿命降低，而与此同时，系统间交叉速率的成比例的较大增加导致较高的三重态产率（相应地为0.23和0.97）。含硒染料（TMR-Se）在77 K和室温下，当溶液中清除氧气时，显示出突出的磷光。这反映在单线态氧产生的高产率中，如单线态氧磷光的测量所示。TMR-Se的高单线态氧产率（0.87）表明其在生物学和化学应用中用作产生单线态氧的有效光敏剂。
Photophysical properties of a series of tetramethylrosamine dyes in which the xanthylium oxygen atom has been replaced with sulfur or selenium were examined. Dyes with sulfur and, especially, with selenium show decreased fluorescence quantum yield and lifetimes, while at the same time proportionally larger increases in the rates of intersystem crossing lead to higher triplet yields (0.23 and 0.97, correspondingly). The selenium-containing dye (TMR-Se) displays prominent phosphorescence at 77 K and at room temperature when the solution is purged of oxygen. This is reflected in a high yield for singlet oxygen generation as shown by measurements of singlet oxygen phosphorescence. The high singlet oxygen yield for TMR-Se (0.87) suggests its use as an efficient photosensitizer for the generation of singlet oxygen in biology and chemistry applications.