University of Bordeaux/CNRS, Institut des Sciences Moléculaires, 351, crs de la Libération, 33405 Talence, France.
J Phys Chem A. 2011 Dec 8;115(48):14034-9. doi: 10.1021/jp2077775. Epub 2011 Nov 9.
BF(2)-Azadipyrromethene dyes are a promising class of NIR emitter (nonhalogenated) and photosensitizer (halogenated). Spectroscopic studies on a benchmark example of each type, including absorption (one and two photon), time-resolved transient absorption (ps-ms) and fluorescence, are reported. Fast photodynamics reveal that intense nanosecond NIR fluorescence is quenched in a brominated analog, giving rise to a persistent (21 μs) transient absorption signature. Kinetics for these changes are determined and ascribed to the efficient population of a triplet state (72%), which can efficiently sensitize singlet oxygen formation (ca. 74%), directly observed by (1)Δ(g) luminescence. Photostability measurements reveal extremely high stability, notably for the nonhalogenated variant, which is at least 10(3)-times more stable (Φ(photodeg.) = < 10(-8)) than some representative BODIPY and fluorescein dyes.
BF(2)-偶氮吡咯甲川染料是一类很有前途的近红外发射体（无卤素）和光动力试剂（卤素化）。报告了对每种类型的基准示例的光谱研究，包括吸收（单光子和双光子）、时间分辨瞬态吸收（皮秒-毫秒）和荧光。快速光动力研究表明，强纳秒近红外荧光在溴化类似物中被猝灭，产生持久（21 μs）瞬态吸收特征。这些变化的动力学被确定并归因于三重态（72%）的有效分布，这可以有效地敏化单线态氧的形成（约 74%），这可以通过（1）Δ（g）发光直接观察到。光稳定性测量显示出极高的稳定性，特别是对于非卤素变体，其稳定性至少比一些代表性的 BODIPY 和荧光染料高 10（3）倍（Φ（photodeg.）<10（-8））。
