Polar Fluorenes and Spirobifluorenes: Fluorescence and Fluorescence Anisotropy Spectra
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- 作者：Luca Grisanti ; Francesca Terenziani ; Cristina Sissa ; Marco Cavazzini ; Fabio Rizzo ; Simonetta Orlandi ; Anna Painelli
- 刊名：Journal of Physical Chemistry B
- 出版年：2011
- 出版时间：October 6, 2011
- 年：2011
- 卷：115
- 期：39
- 页码：11420-11430
- 全文大小：1225K
- 年卷期：v.115,no.39(October 6, 2011)
- ISSN：1520-5207
文摘
An extensive spectroscopic study is presented of two asymmetrically substituted fluorene dyes and of the related spiro dimers in both liquid and glassy solvents. Essential-state models are developed to accurately reproduce linear absorption and fluorescence spectra and their complex dependence on solvent polarity. The same models are exploited to quantitatively calculate fluorescence excitation and anisotropy spectra in rigid matrixes. Impressive red-edge effects observed for spiro dimers in glassy polar solvents are accurately reproduced and understood. Interchromophore interactions in the spiro dimers are very small, leading to marginal effects in absorption and fluorescence spectra, but they effectively promote energy transfer between the two chromophores, as best evidenced comparing anisotropy spectra of the substituted fluorenes and of corresponding spiro dimers dissolved in glassy solvent matrixes.