Charge separated states and singlet oxygen generation of mono and bis adducts of C60 and C70
Charge separated states and singlet oxygen generation of mono and bis adducts of C60 and C70
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DOI：
10.1016/j.chemphys.2015.12.003
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发表时间：
2016-02-03
期刊：
影响因子：
2.3
通讯作者：
Porfyrakis, Kyriakos
中科院分区：
文献类型：
--
作者：
Dallas, Panagiotis;Rogers, Gregory;Porfyrakis, Kyriakos
我们提出了一系列富勒烯衍生物以及对其光致发光特性的研究，以及它们作为单线态氧产生光敏剂的效率。我们证明了芘供体和富勒烯受体之间的分子内电荷转移。对于 C-60 和 C-70 的单加合物和双加合物，首次观察到衰变寿命测量中的相反效应，表明电荷分离和局部激发态之间的相互作用。对于C-60的单加合物和C-70的双加合物观察到单指数衰减，而对于C-60的双加合物和C-70的单加合物观察到双指数衰减。使用详细的 3D 激发光致发光图测试了这些分子作为单线态氧自由基敏化剂的效果。观察到C-60-单和C-70-双加合物的单线态氧猝灭，同时观察到C-60-双和C-70-单加合物的强光敏效应。 (C) 2015 Elsevier B.V. 保留所有权利。
We present a series of fullerene derivatives and a study on their photoluminescence properties, complete with their efficiency as singlet oxygen generation photosensitizers. We demonstrate the intramolecular charge transfer between pyrene donor and fullerene acceptor. The opposite effect in decay lifetime measurements is observed for the mono and bis adducts of C-60 and C-70 for the first time, indicating an interplay between charge-separation and locally excited states. A monoexponential decay was observed for the mono adduct of C-60 and the bis adduct of C-70, while a biexponential decay was observed for the bis adduct of C-60 and the mono adduct of C-70. The effect of these molecules as sensitizers of the singlet oxygen radical was tested using detailed 3D excitation photoluminescence maps. A quenching of the singlet oxygen for the C-60- mono and C-70- bis adducts was observed while a strong photosensitizing effect was observed for the C-60- bis and C-70- mono adducts. (C) 2015 Elsevier B.V. All rights reserved.