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Titolo:
Time-domain observation of external magnetic field effects on the delayed fluorescence of N,N,N ',N '-tetramethyl-1,4-phenylenediamine in alcoholic solution
Autore:
Iwasaki, Y; Maeda, K; Murai, H;
Indirizzi:
Tohoku Univ, Grad Sch Sci, Dept Chem, Sendai, Miyagi 9808578, Japan TohokuUniv Sendai Miyagi Japan 9808578 em, Sendai, Miyagi 9808578, Japan
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY A
fascicolo: 13, volume: 105, anno: 2001,
pagine: 2961 - 2966
SICI:
1089-5639(20010405)105:13<2961:TOOEMF>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
ION-PAIR; ELECTROGENERATED CHEMILUMINESCENCE; MONOPHOTONIC IONIZATION; GEMINATE RECOMBINATION; N,N,N',N'-TETRAMETHYL-P-PHENYLENEDIAMINE; RESONANCE; PHOTOCONDUCTIVITY; PHOTOIONIZATION; PHOTOLYSIS; LUMINESCENCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Murai, H Tohoku Univ, Grad Sch Sci, Dept Chem, Sendai, Miyagi 9808578, Japan Tohoku Univ Sendai Miyagi Japan 9808578 i, Miyagi 9808578, Japan
Citazione:
Y. Iwasaki et al., "Time-domain observation of external magnetic field effects on the delayed fluorescence of N,N,N ',N '-tetramethyl-1,4-phenylenediamine in alcoholic solution", J PHYS CH A, 105(13), 2001, pp. 2961-2966

Abstract

The external magnetic field effects (MFEs) on the intensity of the delayedfluorescence from N,N,N',N'-tetramethyl-1,4-phenylenediamine (TMPD) are studied in mixed alcohol and 2-propanol under the conditions of both low and high concentration of TMPD at room temperature, In mixed alcohol solution, three different MFEs on the delayed fluorescence intensity are separated bytime-domain observation and different concentration conditions. The MFEs in the solution of low concentration can be explained by the radical-pair mechanism (RPM) of the: TMPD cation radical and the solvated electron in the early-time region and the triplet-triplet pair mechanism (TTPM) through triplet-triplet annihilation (T-T annihilation) in the later-time region. In the solution of high concentration, the MFEs can be explained by the TTPM inthe early-time region and the triplet-doublet pair mechanism (TDPM) in thelater-time region. This TDPM affects the delayed fluorescence intensity ofT-T annihilation. In 2-propanol, similar results are obtained, except for no apparent observation of the RPM. According to the present results, it isclarified that TMPD in alcohol emits two types of the delayed fluorescence, recombination type and T-T annihilation type. The former Shows the MFEs due to the RPM, and the latter shows the two different MFEs of the TTPM and the TDPM.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 00:13:26