Thiadicarbocyanine (C5)dye |
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| The chemical structure of Thiadicarbocyanine (C5)dye 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 Thiadicarbocyanine (C5)dye 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]. Thiadicarbocyanine (C5)dye has a molar extinction coefficient of 249,000 M-1cm-1 at 655.75 nm [P. J. Sims, A. S. Waggoner, C.-H. Wang, and J. F. Hoffman, "Studies on the mechanism by which cyanine dyes measure membrane potential in red blood cells and phosphatidylcholine vesicles," Biochem., 13, 3315-3330, 1974]. The extinction coefficient has been reported to be 200,000 cm-1/M in dimethylsulfoxide [R. R. Birge, "Kodak Laser Dyes," 1987]. The fluorescence yield has been reported to be 0.36 in methanol [G. M. Bilmes, J. O. Tocho, and S. E. Braslavsky, "Photophysical processes of polymethine dyes. An absorption, emission, and optoacoustic study on 3,3'-diethylthiadicarbocyanine iodide.," J. Phys. Chem., 93, 6696-6699, 1989]. |
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Fluorescence
This is the fluorescence emission spectrum of Thiadicarbocyanine (C5)dye dissolved in ethanol. The spectrum was taken by R. A. Fuh on summer, 95 using an excitation wavelength of 570 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 0.35 [D. N. Dempster, T. Morrow, R. Rankin, and G. F. Thompson, "Photochemical characteristics of cyanine dyes. Part 1. 3,3'-Diethyloxadicarbocyanine iodide and 3,3'-diethylthiadicarbocyanine iodide," J. Chem. Soc., Faraday Trans. II, 68, 1479-1496, 1972]. |
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