Coumarin 6 |
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| The chemical structure of Coumarin 6 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 Coumarin 6 dissolved in ethanol. It was measured by R. A. Fuh on 6/21/95 [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]. Coumarin 6 has a molar extinction coefficient of 54,000 M-1cm-1 at 459.25 nm [G. A. Reynolds and K. H. Drexhage, "New coumarin dyes with rigidized structure for flashlamp-pumped dye lasers," Optics Commun., 13, 222-225, 1975]. Other extinction coefficients include 55-70,000 cm-1/M in acetonitrile [G. JonesÝII, W. R. Jackson, C. Choi, and W. R. Bergmark, "Solvent effects on emission yield and lifetime for coumarin laser dyes. Requirements for a rotatory decay mechanism.," J. Phys. Chem., 89, 294-300, 1985]. Other fluorescence yields include 0.63 in acetonitrile [G. JonesÝII, W. R. Jackson, C. Choi, and W. R. Bergmark, "Solvent effects on emission yield and lifetime for coumarin laser dyes. Requirements for a rotatory decay mechanism.," J. Phys. Chem., 89, 294-300, 1985]. |
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Fluorescence
This is the fluorescence emission spectrum of Coumarin 6 dissolved in ethanol. The spectrum was taken by R. A. Fuh on 6/21/95 using an excitation wavelength of 420 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 0.78 [G. A. Reynolds and K. H. Drexhage, "New coumarin dyes with rigidized structure for flashlamp-pumped dye lasers," Optics Commun., 13, 222-225, 1975]. |
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