Position dependent heavy atom effect in physical triplet quenching by electron donors
نویسندگان
چکیده
منابع مشابه
Physical Triplet Quenching by Electron Donors
Absolute radical yields, as determined by flash spectroscopy, are reported for the reaction of the thionine triplet 3TH+ and its protonated form 3TH2++ with a variety of electron donors in methanolic solution. The different yields, extrapolated to infinite donor concentrations, are due to partial physical quenching of the triplets in the electron transfer reaction. The results are indicative of...
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In several fields of research, like e.g. photosensitization, photovoltaics, organic electroluminescent devices, dynamic nuclear polarization, or pulsed dipolar electron paramagnetic resonance spectroscopy, triplet state kinetics play an important role. It is therefore desirable to tailor the kinetics of photoexcited triplet states, e.g. by exploiting the intramolecular heavy-atom effect, and to...
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The radical yield in the electron t ransfer reactions between thionine tr iplet and various halogenanilines, as measured by kinetic flash spectroscopy in the microsecond time region, decreases by application of magnetic fields up to 4 kGauss . The relative magnetic field effect parallels the influence of the heavy atom substi tuents on the intersystem crossing ra te constant in the triplet exci...
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The radical yield in the electron transfer reactions ?etween ~hionine trip.let and. various halo· genanilines as measured by kinetic flash spectroscopy m the mIcrosecond tIme regIon, decreases by applica;ion of magnetic fields up to 4 kGauss: The relative m~gnetic field effect. parallels. the influence of the heavy atom substituents on the mtersystem crossmg rate. constant m the. trIplet excipl...
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A mechanism is presented explammg a reported heavy-atom-Induced magnetic field effect as a consequence of nonequihbrmm tnplet sublevel population m an mtermedlate euclplex. The tnplet exclplex spm polanzatlon IS induced by sublevel-selective mtersystem crossmg from the ewlplex trIplet to Its smglet ground state and IS decreased by an external magnetic field. The theory accounts almost quantltat...
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ژورنال
عنوان ژورنال: Chemical Physics Letters
سال: 1978
ISSN: 0009-2614
DOI: 10.1016/0009-2614(78)87040-7