Cryptocyanine |
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| The chemical structure of Cryptocyanine 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 Cryptocyanine dissolved in ethanol. 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]. Cryptocyanine has a molar extinction coefficient of 210,000 M-1cm-1 at 709.5 nm [D. N. Dempster, T. Morrow, R. Rankin, and G. F. Thompson, "Photochemical characteristics of the mode-locking dyes 1,1'-diethyl-4,4'-carbocyanine iodide (cryptocyanine, DCI) and 1,1'-diethyl-2,2' dicarbocyanine iodide (DDI)," Chem. Phys. Lett., 18, 488-492, 1973].
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Fluorescence
This is the fluorescence emission spectrum of Cryptocyanine dissolved in ethanol. The spectrum was taken by R. A. Fuh on summer, 97 using an excitation wavelength of 650 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 0.007 [D. N. Dempster, T. Morrow, R. Rankin, and G. F. Thompson, "Photochemical characteristics of the mode-locking dyes 1,1'-diethyl-4,4'-carbocyanine iodide (cryptocyanine, DCI) and 1,1'-diethyl-2,2' dicarbocyanine iodide (DDI)," Chem. Phys. Lett., 18, 488-492, 1973]. |
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