Geminate recombination kinetics has been studied using the diffuse reflectance laser flash technique of radical ion pairs (RIP) formed by electron transfer from triphenylamine to triplet benzophenone, 9,1 O-anthraquinone, duroquinone or 2,6diphenyl-1,4benzoquinone both adsorbed onto porous silica. T
Temperature dependence of the geminate recombination of radical ion pairs
β Scribed by Heinrich Schomburg; Hubert Staerk; Albert Weller; Hans-Joachim Werner
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 443 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
The photoinduced formation of radical ion pairs (in fluorescence quenching) and their geminate recombination to give singier &round state) and triplet product states IS studied at different temperatures between 233 and 296 K with the system pyrene/N,Ndimeth&mline (DMA) in methanol. l%e geminate singlet recombination yield is found to be strongly increasing with decreasing temperature, whereas the triplet yield is virtually independent of temperature. These results are in agreement with previous theoretical predictions.
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The magnetic-field-dependent kinetics of geminate radical pairs, created by electron transfer from aniline fo rhionine triplet in reversed micelles has been studied by nanosecond laser flash spectroscopy. Dependin, = on the water concentration, the rate constant of intrarnicek recombination is reduc
Pulsed laser excitation of pyrene @'j/N, N-diethylaniline (DEA) solutions in methanol at low temperatures leads to the generation of the P-and DEA+ radical ions. A fast initial decay of the ions (T served and is attributed to geminate recombination within the initially formed (2P-\_\_ '3 = 37 nsec a
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Scintillation pulse shapes from solutions of para-tcrphenyl in dccalin, yu.ri~rre and benzcnc can be cbangcd by magnetic fields. A striking effect of deutcration on the evolution of the effect in time is obscrvcd. confirming the rote of cIectronnuclear hypcrfirw interaction in the solute radical ion
The recombination kinetics of geminate electron-cation pairs in liquid hexane depends on the photoionization wavelength used for charge pair creation. Pairs generated by two-photon ionization of anthracene with 355 nm light exhibit a first half-life for recombination of 108 ps at 191 K; 266 nm light