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Estimation of Singlet Oxygen Quantum Yield Using Novel Green-Absorbing Baird-type Aromatic Photosensitizers†
Photochemistry and Photobiology ( IF 2.6 ) Pub Date : 2021-07-06 , DOI: 10.1111/php.13483
Jayla Morgan 1 , Young Ju Yun 1, 2 , A Jean-Luc Ayitou 1, 2
Affiliation  

We report two new organic green-absorbing singlet oxygen (1O2) photosensitizers: Quinoidal naphthyl thioamide (QDM) and bis-iodol-dipyrrolonaphthyridine-dione (I2DPND), with triplet energies of 40.8 and 47.5 kcal mol−1(at 77 K in a glassy matrix) , respectively. The UV–vis absorption and emission characteristics of QDM and I2DPND are similar to other commercially available organic 1O2 photosensitizers such as Rose Bengal, which was used as standard/reference to estimate the 1O2 quantum yield (Φ) of the chromophores under study. Using 9,10-diphenylanthracene (DPA) as an 1O2 quencher, we estimated the Φ ≈ 67–85% for QDM and Φ ≈ 25–32% for I2DPND. The discrepancy in the Φ values could be explained by the apparent photo-decomposition of the later dye. Nevertheless, the high Φ value for QDM is unprecedented, as this chromophore exhibits relatively low structural complexity and could further be derivatized to create novel photodynamic agents.

中文翻译:

使用新型绿色吸收 Baird 型芳香族光敏剂估算单线态氧量子产率†

我们报告了两种新的有机绿色吸收单线态氧 ( 1 O 2 ) 光敏剂:喹啉萘基硫代酰胺 ( QDM ) 和碘二吡咯萘啶二酮 ( I 2DPND ),三线态能量分别为 40.8 和 47.5 kcal mol -1 (在 77 K 的玻璃基质中),分别。QDMI 2 - DPND的 UV-vis 吸收和发射特性与其他市售有机1 O 2光敏剂如 Rose Bengal 相似,后者被用作估计1 O的标准/参考。2正在研究的发色团的量子产率 (Φ )。使用 9,10-二苯蒽 ( DPA ) 作为1 O 2猝灭剂,我们估计QDM的 Φ ≈ 67–85%和I 2DPND的Φ ≈ 25–32% 。Φ Δ值的差异可以通过后期染料的明显光分解来解释。尽管如此,QDM的高 Φ Δ值是史无前例的,因为这种发色团表现出相对较低的结构复杂性,并且可以进一步衍生以创造新的光动力剂。
更新日期:2021-07-06
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