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2,5-Diphenyloxazole (PPO)

The chemical structure of 2,5-Diphenyloxazole (PPO) 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. Chemical Structure

Absorption

Absorption Spectrum

This is a graph of the molar extinction coefficient of 2,5-Diphenyloxazole (PPO) dissolved in cyclohexane. It was measured by R. A. Fuh on 6/26/95 [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]. 2,5-Diphenyloxazole (PPO) has a molar extinction coefficient of 35,700 M-1cm-1 at 302.75 nm [I. B. Berlman, Handbook of Fluorescence Spectra of Aromatic Molecules, Academic Press, 1971].

For further spectroscopic studies of this general class of compounds, see [T. G. Pavlopoulos and P. R. Hammond, "Spectroscopic studies of some laser dyes.," J. Am. Chem. Soc., 96, 6568-6579, 1974].

Original Data | Extinction Data

Fluorescence

Emission Spectrum

This is the fluorescence emission spectrum of 2,5-Diphenyloxazole (PPO) dissolved in cyclohexane. The spectrum was taken by R. A. Fuh on 6/26/95 using an excitation wavelength of 280 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 1.0 [I. B. Berlman, Handbook of Fluorescence Spectra of Aromatic Molecules, Academic Press, 1971].

Original Data

This page and graphs were created by Scott Prahl.