Photochemical site conversion: Octatetraene inn‐octane
| Autor: | Bryan E. Kohler, John R. Ackerman, Larry Katz, Stuart A. Forman, Konrad T. Wu |
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| Rok vydání: | 1984 |
| Předmět: | |
| Zdroj: | The Journal of Chemical Physics. 81:3387-3392 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.448089 |
| Popis: | Irradiation of n‐alkane solutions of all‐trans octatetraene at temperatures below 10 K produces a number of photoproducts. This paper reports spectroscopic and thermodynamic properties of one of these which has been identified to be the all‐trans isomer in a second, less stable crystallographic site than that produced by slowly cooling through a succession of equilibrium states. This identification follows from the excited state lifetime and high resolution fluorescence and one‐ and two‐photon excitation spectra for this photoproduct in n‐octane which show that: (1) states of this photoproduct are only slightly shifted with respect to those of the all‐trans precursor; (2) the fluorescence lifetime is nearly the same as that measured previously for the all‐trans precursor; (3) the photoproduct is only stable at temperatures below 20 K, at higher temperatures it reverts to the all‐trans isomer in the minimum energy site; and (4) the photoproduct is centrosymmetric. In the ground state the conversion of this... |
| Databáze: | OpenAIRE |
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