Coumarin 30 |
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| The chemical structure of Coumarin 30 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 30 dissolved in acetonitrile. 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 30 has a molar extinction coefficient of 42,800 M-1cm-1 at 407 nm [R. R. Birge, "Kodak Laser Dyes," 1987]. The literature absorption data were obtained in methanol. The extinction coefficient is reported to be 55,000-70,000 cm-1/M [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]. The fluorescence yield is reported to be 0.35 in 95% ethanol [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 30 dissolved in acetonitrile. The spectrum was taken by R. A. Fuh on 6/21/95 using an excitation wavelength of 380 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 0.67 [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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