Coumarin 1 |
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| The chemical structure of Coumarin 1 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 1 dissolved in ethanol. 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]. Coumarin 1 has a molar extinction coefficient of 23,500 M-1cm-1 at 373.25 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]. The fluorescence yield also has been reported to be 0.50 [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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Fluorescence
This is the fluorescence emission spectrum of Coumarin 1 dissolved in ethanol. The spectrum was taken by R. A. Fuh on summer, 95 using an excitation wavelength of 360 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 0.73 [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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