Molecular Spectroscopy Group, Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco, UPV/EHU, Apartado 644, 48080 Bilbao, Spain.
Phys Chem Chem Phys. 2019 Sep 18;21(36):20403-20414. doi: 10.1039/c9cp03454d.
A complete photophysical study on the iodinated-BODIPY, 3,5-dimethyl-2,6-diiodo-8-thiomethyl-pyrromethene (MeSBDP), demonstrated that it is an excellent triplet photosensitizer for singlet oxygen production in a broad range of apolar and polar solvents. Besides its absorption and fluorescence emission spectra, the dynamics of its excited states including its intersystem crossing rate was characterized by femtosecond transient experiments. The photophysical study of its triplet state by nanosecond transient absorption spectroscopy and phosphorescence emission concluded to a diffusion-controlled quenching of 3MeSBDP by O2 and to a fraction of triplet state quenching by O2 close to unity. The high (>0.87) and solvent-insensitive singlet oxygen quantum yield φΔ measured by singlet oxygen phosphorescence emission, together with the noticeable photostability of MeSBSP, as well as the absence of quenching of singlet oxygen by MeSBDP itself, allows claiming it as an alternative standard photosensitizer for singlet oxygen production, under excitation either in the UV or in the visible range.
对碘代-BODIPY（3,5-二甲基-2,6-二碘-8-硫甲基吡咯并[3,4-b]吡咯）进行了全面的光物理研究，结果表明，它是一种在广泛的非极性和极性溶剂中产生单线态氧的优秀三重态光敏剂。除了吸收和荧光发射光谱外，通过飞秒瞬态实验还对其激发态动力学（包括系间穿越速率）进行了表征。通过纳秒瞬态吸收光谱和磷光发射对其三重态的光物理研究表明，3MeSBDP 被 O2 扩散控制猝灭，且 O2 对三重态猝灭的分数接近 1。通过单线态氧磷光发射测量的高（>0.87）且溶剂不敏感的单线态氧量子产率 φΔ，以及 MeSBSP 的显著光稳定性，以及 MeSBDP 本身不会猝灭单线态氧，使其成为在紫外或可见光激发下产生单线态氧的替代标准光敏剂。
