toluene |
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| The chemical structure of toluene is shown at the right. The absorption and fluorescence emission spectra are shown below. The structure, absorption, and fluorescence data were all obtained from the PhotochemCAD package by Jonathan Lindsey. This excellent program allows rapid comparison of spectra and enables one to do a variety of photochemically relevant calculations. |
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Absorption
This is a graph of the molar extinction coefficient of toluene dissolved in cyclohexane. It was measured by R. A. Fuh on summer, 95 [H. Du, R. A. Fuh, J. Li, A. Corkan, J. S. Lindsey, "PhotochemCAD: A computer-aided design and research tool in photochemistry," Photochemistry and Photobiology, 68, 141-142, 1998]. toluene has a molar extinction coefficient of 2,864 M-1cm-1 at 261.75 nm [I. B. Berlman, Handbook of Fluorescence Spectra of Aromatic Molecules, Academic Press, 1971]. The fluorescence yield is reported to be 0.14 in cyclohexane [F. H. Quina and F. A. Carroll, "Radiative and nonradiative transitions in solution. First excited singlet state of benzene and its methyl derivatives.," J. Am. Chem. Soc., 98, 6-9, 1976]. |
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Fluorescence
This is the fluorescence emission spectrum of toluene dissolved in cyclohexane. The spectrum was taken by R. A. Fuh on summer, 95 using an excitation wavelength of 242 nm [H. Du, R. A. Fuh, J. Li, A. Corkan, J. S. Lindsey, "PhotochemCAD: A computer-aided design and research tool in photochemistry," Photochemistry and Photobiology, 68, 141-142, 1998]. The quantum yield is 0.17 [I. B. Berlman, Handbook of Fluorescence Spectra of Aromatic Molecules, Academic Press, 1971]. |
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