We have recently shown that solid efficiently converts into a cap-to-cap dimer at pressure of ∼1 GPa and temperature of ∼200 °C [1]. Here we report on measurements of the thermal dissociation of (purified by chromatography) at ambient pressure and its photophysical properties, in particular photogeneration of singlet oxygen The kinetics of dissociation of in the solid state between 130 and 200 °C is well described by a simple first-order process, with an activation energy of (compare to for the dimer [2]). In contrast, the thermal dissociation of dissolved in o-dichlorobenzene shows different, non-Arrhenius behavior, suggesting a strong influence of the molecular surroundings. The quantum efficiency of generation in solutions of and is close to unity, i.e. similar to that of and
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21 November 2000
ELECTRONIC PROPERTIES OF NOVEL MATERIALS—MOLECULAR NANOSTRUCTURES: XIV International Winterschool/Euroconference
4-11 March 2000
Kirchberg, Tirol (Austria)
Research Article|
November 21 2000
Dimerization of under high pressure: Thermal dissociation and photophysical properties of the dimer
S. Lebedkin;
S. Lebedkin
1Forschungszentrum Karlsruhe—Technik und Umwelt, Institut für Nanotechnologie
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W. E. Hull;
W. E. Hull
2Central Spectroscopy Department, German Cancer Research Center, D-69120 Heidelberg, Germany
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A. Soldatov;
A. Soldatov
3Forschungszentrum Karlsruhe—Technik und Umwelt, Institut für Festkörperphysik, P.O. Box 3640, D-76021 Karlsruhe, Germany
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B. Renker;
B. Renker
3Forschungszentrum Karlsruhe—Technik und Umwelt, Institut für Festkörperphysik, P.O. Box 3640, D-76021 Karlsruhe, Germany
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M. M. Kappes
M. M. Kappes
1Forschungszentrum Karlsruhe—Technik und Umwelt, Institut für Nanotechnologie
4Institut für Physikalische Chemie II, Universität Karlsruhe, D-76128 Karlsruhe, Germany
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AIP Conf. Proc. 544, 77–80 (2000)
Citation
S. Lebedkin, W. E. Hull, A. Soldatov, B. Renker, M. M. Kappes; Dimerization of under high pressure: Thermal dissociation and photophysical properties of the dimer . AIP Conf. Proc. 21 November 2000; 544 (1): 77–80. https://doi.org/10.1063/1.1342472
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