Competition between fluorescence and triplet production ruled by nitro groups in one-arm and two-arm styrylbenzene heteroanalogues

文献情報

出版日 2020-11-04

DOI 10.1039/D0PP00271B

インパクトファクター 0

著者

Letizia Mencaroni, Benedetta Carlotti, Alessio Cesaretti, Fausto Elisei, Ana Grgičević, Irena Škorić, Anna Spalletti

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要旨

The competition between excited state deactivation processes in mono and double-arm push–pull systems bearing pyridine, furan or thiophene (electron donors) and nitro groups (electron acceptors) was investigated in several solvents through nanosecond and femtosecond transient absorption spectroscopy. Triplet population is the main deactivation pathway for the mono-arm compounds. The large triplet production is mainly ascribed to 3(n,π*) states almost isoenergetic to S1, introduced by nitro groups, as predicted by TD-DFT calculations. The large triplet population may indeed be exploited to produce long-lived excitons for photovoltaic and optoelectronic applications. Two-arm furan and thiophene derivatives instead undergo strong ultrafast intramolecular charge transfer (ICT), which is responsible for their appreciable two-photon absorption cross-sections. In this case, significant fluorescence and singlet oxygen quantum yields are obtained, making these two compounds interesting as potential traceable photosensitizers in photodynamic therapy.

掲載誌

Photochemical & Photobiological Sciences

CiteScore: 5.6

自己引用率: 7.4%

年間論文数: 154

Photochemical & Photobiological Sciences (PPS) is a monthly journal for the publication of original research papers (Full papers), Reviews, Perspectives, Communications and Technical notes of current interest in the areas of photochemistry and photobiology. The journal also contains a Forum section. PPS is published by Springer and is the official journal of the European Society for Photobiology (ESP) and the European Photochemistry Association (EPA). The journal publishes articles on the interaction of light with molecules, supramolecular systems or biological matter. Topics include, but are not limited to the following. Applied photochemistry Atmospheric photochemistry Bioluminescence Chronobiology DNA repair Energy transfer Environmental photobiology Environmental photochemistry Excited state properties Laser photochemistry Luminescence Mechanistic photochemistry Organic and inorganic photochemistry Photocarcinogenesis Photochemical kinetics Photochemistry of biomolecules Photochemotherapy Photochromism Photodegradation Photodermatology Photoelectrochemistry Photoimaging Photoimmunology Photomedicine Photomorphogenesis Photomovement Photoprotection Photoreception Photosensitisation Photosynthesis Phototechnology Phototherapy Phototoxicity Solar energy utilisation Spectroscopy Spectroscopy of biological systems Supramolecular photochemistry Synthetic photochemistry Theoretical photochemistry UV and visible radiation effects and vision