DataSheet1_Migration of Excitation Energy in Furocoumarins.PDF

The migration of excitation energy of a number of psoralen compounds has been studied. For this, the methods of induced absorption spectroscopy, stationary electron spectroscopy, fluorescence and phosphorescence, as well as quantum chemistry were used. A comparative photostability of psoralen was achieved by exposure to a XeCl excilamp irradiation (emission wavelength λem = 308 nm) with parameters Δλ = 5–10 nm, Wpeak = 18 mW/cm2, p = 8.1 J/cm3, f = 200 kHz, pulse duration 1 μs. It was found that the singlet-triplet transition played a major role in the migration of excitation energy into triplet states. Among all tested compounds, substances with an OCH3-group in the structure have the strongest effect on the spectral-luminescent characteristics.

本研究针对多种补骨脂素类化合物的激发能迁移行为展开了系统探究。为开展该研究，我们采用了诱导吸收光谱法、稳态电子光谱法、荧光与磷光光谱法以及量子化学计算手段。为对比评估补骨脂素(Psoralen)的光稳定性，我们采用XeCl准分子灯(XeCl excilamp)进行辐照测试，其辐照参数为：发射波长λem=308 nm，光谱带宽Δλ=5~10 nm，峰值功率密度Wpeak=18 mW/cm²，体积比能量p=8.1 J/cm³，重复频率f=200 kHz，脉冲持续时长1 μs。研究结果表明，单重态-三重态跃迁在激发能向三重态的迁移过程中占据主导地位。在所测试的全部化合物中，结构中带有OCH3基团的物质对其光谱-发光特性的影响最为显著。