1,2-diphenylacetylene |
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| The chemical structure of 1,2-diphenylacetylene 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 1,2-diphenylacetylene dissolved in ethanol. It was measured by Junzhong Li on 12/11/97 [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]. 1,2-diphenylacetylene has a molar extinction coefficient of 27,560 M-1cm-1 at 279 nm [J. B. Armitage, N. Entwistle, E. R. H. Jones, and M. C. Whiting, "Researches on acetylenic compounds part XLI. The synthesis of diphenylpolyacetylenes.," J. Chem. Soc., 147-154, 1954]. The fluorescence yield increases to 0.5 at 77 K in an EPA glass [C. Ferrante, U. Kensy, and B. Dick, "Does diphenylacetylene (tolan) fluoresce from its second excited singlet state? Semiempirical MO calculations and fluorescence quantum yield measurements," J. Phys. Chem., 97, 13457-13463, 1993]. |
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Fluorescence
This is the fluorescence emission spectrum of 1,2-diphenylacetylene dissolved in ethanol. The spectrum was taken by Junzhong Li on 12/11/97 using an excitation wavelength of 277 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 0.00336 [C. Ferrante, U. Kensy, and B. Dick, "Does diphenylacetylene (tolan) fluoresce from its second excited singlet state? Semiempirical MO calculations and fluorescence quantum yield measurements," J. Phys. Chem., 97, 13457-13463, 1993]. |
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