4-Dimethylamino-4'-nitrostilbene |
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| The chemical structure of 4-Dimethylamino-4'-nitrostilbene 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-Dimethylamino-4'-nitrostilbene dissolved in benzene. It was measured by R. A. Fuh on summer, 97 [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-Dimethylamino-4'-nitrostilbene has a molar extinction coefficient of 27,000 M-1cm-1 at 432.25 nm [P. P. Shorygin and T. M. Ivanova, "On the simultaneous observation of the raman spectrum and fluorescence," Soviet Phys. Doklady, 3, 764-767, 1958]. The fluorescence yield also has been reported to be 0.53 in benzene, 0.14 in pentane, 0.008 in methylene chloride, and 0.002 in dimethylformamide [H. Gruen and H. Grner, "Trans cis photoisomerization, fluorescence, and relaxation phenomena of trans-4-Nitro-4'-(dialkylamino)stilbenes and analogues with a nonrotatable amino group.," J. Phys. Chem., 93, 7144-7152, 1989]. |
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Fluorescence
This is the fluorescence emission spectrum of 4-Dimethylamino-4'-nitrostilbene dissolved in benzene. The spectrum was taken by R. A. Fuh on summer, 97 using an excitation wavelength of 400 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 0.70 [P. P. Shorygin and T. M. Ivanova, "On the simultaneous observation of the raman spectrum and fluorescence," Soviet Phys. Doklady, 3, 764-767, 1958]. |
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