Picosecond and nanosecond photo-dynamics of a naphthopyran merocyanine

Jonathan Hobley, Vincenzo Malatesta, Koji Hatanaka, Shinji Kajimoto, Sian L. Williams, Hiroshi Fukumura

研究成果: Article同行評審

38 引文 斯高帕斯(Scopus)

摘要

For the first time the photochemistry of the trans, trans (TT) to trans, cis (TC) isomerisation for merocyanines (MCs) of a chromene (CHR) compound has been investigated using steady-state nanosecond and time-resolved femtosecond irradiation. The dominant photo-transformation of the TT isomer by these irradiations is conversion to TC. The yield of the TT to TC photoreaction is inherently low in all solvents studied due to efficient ground state recovery in competition with inter-system crossing, but it is lowest of all in polar solvents. Several intermediate states have been identified in the first 6 ns of the reaction that we tentatively assigned, including a possible twisted MC T1 state. We assign other distinct states to TT S1, TT T1 and a further species to TC T1. The full photochemical conversion from TT to TC is a slower process than 6 ns. The presence of oxygen marginally increases the overall bleaching of the TT isomer and slightly enhances TC formation.

原文English
頁(從 - 到)180-184
頁數5
期刊Physical Chemistry Chemical Physics
4
發行號2
DOIs
出版狀態Published - 2002

All Science Journal Classification (ASJC) codes

  • 物理與天文學 (全部)
  • 物理與理論化學

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