7-Methoxycoumarin-4-acetic acid |
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| The chemical structure of 7-Methoxycoumarin-4-acetic acid 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 7-Methoxycoumarin-4-acetic acid dissolved in methanol. 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]. 7-Methoxycoumarin-4-acetic acid has a molar extinction coefficient of 11,820 M-1cm-1 at 323.75 nm [R. Farinotti, P. Siard, J. Bourson, S. Kirkiacharian, B. Valeur, and G. Mahuzier, "4-Bromomethyl-6,7-dimethoxycoumarin as a fluorescent label for carboxylic acids in chromatographic detection," J. Chromatography, 269, 81-90, 1983].
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Fluorescence
This is the fluorescence emission spectrum of 7-Methoxycoumarin-4-acetic acid dissolved in methanol. 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 0.18 [R. Farinotti, P. Siard, J. Bourson, S. Kirkiacharian, B. Valeur, and G. Mahuzier, "4-Bromomethyl-6,7-dimethoxycoumarin as a fluorescent label for carboxylic acids in chromatographic detection," J. Chromatography, 269, 81-90, 1983]. |
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