PHOTOISOMERIZATION DYNAMICS AND SPECTROSCOPY OF THE POLYMETHINE DYE DTCI
PHOTOISOMERIZATION DYNAMICS AND SPECTROSCOPY OF THE POLYMETHINE DYE DTCI
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DOI：
10.1021/j100038a008
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发表时间：
1995-09-21
影响因子：
--
通讯作者：
BILMES, GM
中科院分区：
文献类型：
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作者：
DIPAOLO, RE;SCAFFARDI, LB;BILMES, GM
使用激光吸收光谱、激光诱导荧光和脉冲激光光声光谱来表征花青染料 3,3'-二乙基硫代碳花青碘化物 (DTCI) 光异构体的光物理和光谱参数、光异构化和反光异构化量子产率值（phi(NP) = 0.20 +/- 0.03 和 phi(PN) = 0.16 +/- 0.03），以及。获得了光异构体的吸收截面和基态能量含量的值。该物种的荧光量子效率可以忽略不计。与 DODCI 和部花青 540 的发现类似，这些结果表明不经过中间扭曲态的内部转换是激发光异构体的主要失活步骤。
Laser absorption spectroscopy, laser-induced fluorescence, and pulsed-laser optoacoustic spectroscopy were used to characterize photophysical and spectroscopic parameters of the photoisomer of the cyanine dye 3,3'-diethylthiacarbocyanine iodide (DTCI), Values for the photoisomerization and back-photoisomerization quantum yields (phi(NP) = 0.20 +/- 0.03 and phi(PN) = 0.16 +/- 0.03, respectively), as well. as values for absorption cross sections and the energy content of the ground state of the photoisomer, were obtained. The quantum efficiency of fluorescence of this species was found negligible. Similar to the findings for DODCI and Merocyanine 540, these results suggest that internal conversion without passing through an intermediate twisted state is the main deactivation step for the excited photoisomer.