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Monophotonic ionization of N,N,N′,N′-tetramethyl-p-phenylenediamine excited with near-UV light pulse. Temperature dependence in acetonitrile solution

✍ Scribed by Yoshinori Hirata; Yoshinori Tanaka; Noboru Mataga

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 475 KB
Volume: 193
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(92)85679-5

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✦ Synopsis

The temperature dependence of the photoionization process of N,N,N',N'-tetramethyl-pphenylenediamine (TMPD) in acetonitrile has been investigated by picosecond dye laser photolysis measurements. The ionization rate from the fluorescence state shows an Arrhenius-type relation with an activation energy of 7.4 kcal/mol. The reaction mechanism has been discussed on the basis of the fluctuation of solvent molecules facilitating the ionization.

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Optical spectra (1 to 6 eV) of the neutral electron donor-acceptor complex TMPD-CA have been obtained in different solvents includins polar ones such as acetonitie\_ The optical spectra. the dielectric constant and the ESR absorption have been studied in detail as a function of temperature, in the r