dcm-pyran |
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| The chemical structure of 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM), methanol 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 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM) dissolved in methanol. It was measured by R. A. Fuh on 6/23/95 [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]. 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM), methanol has a molar extinction coefficient of 42,000 M-1cm-1 at 468.5 nm [M. Meyer, J.-C. Mialocq, and B. Perly, "Photoinduced intramolecular charge transfer and trans-cis isomerization of the DCM styrene dye. Picosecond and nanosecond laser spectroscopy, high-performance liquid chromatography, and nuclear magnetic resonance studies.," J. Phys. Chem., 94, 98-104, 1990].
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Fluorescence
This is the fluorescence emission spectrum of 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM) dissolved in methanol. The spectrum was taken by R. A. Fuh on 6/23/95 using an excitation wavelength of 430 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 0.43 [J. M. Drake, M. L. Lesiecki, and D. M. Camaioni, "Photophysics and cis-trans isomerization of DCM," Chem. Phys. Lett., 113, 530-534, 1985]. |
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