p-Quaterphenyl |
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| The chemical structure of p-Quaterphenyl 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 p-Quaterphenyl 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]. p-Quaterphenyl has a molar extinction coefficient of 41,000 M-1cm-1 at 294.75 nm [I. B. Berlman, Handbook of Fluorescence Spectra of Aromatic Molecules, Academic Press, 1971]. The fluorescence yield also has been reported to be 0.92 [S. Hamai and F. Hirayama, "Actinometric determination of absolute fluorescence quantum yields.," J. Phys. Chem., 87, 83-89, 1983]. For further spectroscopic studies of p-quaterphenyl, see [T. G. Pavlopoulos and P. R. Hammond, "Spectroscopic studies of some laser dyes.," J. Am. Chem. Soc., 96, 6568-6579, 1974]. |
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Fluorescence
This is the fluorescence emission spectrum of p-Quaterphenyl dissolved in cyclohexane. The spectrum was taken by R. A. Fuh on summer, 95 using an excitation wavelength of 275 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 0.89 [I. B. Berlman, Handbook of Fluorescence Spectra of Aromatic Molecules, Academic Press, 1971]. |
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