Studying the intersystem crossing rate and triplet quantum yield of meso-substituted porphyrins by means of pulse train fluorescence technique
Studying the intersystem crossing rate and triplet quantum yield of meso-substituted porphyrins by means of pulse train fluorescence technique
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DOI：
10.1142/s1088424616500048
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发表时间：
2016-01-01
影响因子：
1.5
通讯作者：
De Boni, Leonardo
中科院分区：
文献类型：
--
作者：
Bezera de Souza, Tiago Gualberto;Vivas, Marcelo Goncalves;De Boni, Leonardo
采用脉冲序列荧光技术研究了一组带有不同电子给体和受体基团的中位取代卟啉的激发态动力学，特别是系间窜越。发现三重态量子产率关键取决于卟啉体系中中位取代基的性质。带有中位甲氧基苯基的卟啉显示出较高的三重态量子产率（φ(T)在0.70到0.81之间）。此外，甲氧基苯基的数量和取代模式直接影响φ(T)。相反，连接有硝基苯基的卟啉具有较低的三重态量子产率值（约为0.3）。所观察到的结构 - 性质关系为通过化学修饰调节卟啉的光学性质提供了新的途径。
Excited state dynamics, particularly intersystem crossing, of a set of meso-substituted porphyrins bearing different electron-donor and acceptor groups was studied by pulse train fluorescence technique. Triplet quantum yield was found to be critically dependent on the nature of meso-substituents in the porphyrin system. Porphyrins with meso methoxyphenyl groups were found to show high triplet quantum yields (phi(T) between 0.70 and 0.81). Moreover, the quantity of methoxyphenyl groups and the substitution pattern directly influence phi(T). Alternatively, porphyrins attached to nitrophenyl group possess low triplet quantum yield values (similar to 0.3). The observed structure-properties relationships suggest new ways for tuning the optical properties of porphyrins via chemical modification.