Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
DOUBLE PROTON-TRANSFER REACTION OF 7-AZAINDOLE DIMER AND COMPLEXES STUDIED BY TIME-RESOLVED THERMAL LENSING TECHNIQUE
Autore:
SUZUKI T; OKUYAMA U; ICHIMURA T;
Indirizzi:
TOKYO INST TECHNOL,DEPT CHEM,MEGURO KU,2-12-1 OHOKAYAMA TOKYO 152 JAPAN TOKYO INST TECHNOL,DEPT CHEM,MEGURO KU TOKYO 152 JAPAN
Titolo Testata:
The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory
fascicolo: 38, volume: 101, anno: 1997,
pagine: 7047 - 7052
SICI:
1089-5639(1997)101:38<7047:DPRO7D>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYDROGEN-BONDED COMPLEXES; MODEL BASE-PAIRS; EXCITED-STATE; MOLECULAR-DYNAMICS; ALCOHOLS; SOLVATION; CATALYSIS; WATER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
T. Suzuki et al., "DOUBLE PROTON-TRANSFER REACTION OF 7-AZAINDOLE DIMER AND COMPLEXES STUDIED BY TIME-RESOLVED THERMAL LENSING TECHNIQUE", The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, 101(38), 1997, pp. 7047-7052

Abstract

Time-resolved thermal lensing (TRTL) technique was applied to the determination of enthalpy change in double proton transfer reaction of 7-azaindole (AI) dimer and its complexes with acetic acid (AcOH) and methanol in solution. Excited AI dimer/complexes emit violet fluorescenceor undergo rapid double proton transfer (DPT) reaction to form excited tautomers, which emit green fluorescence. The emission quantum yields were successfully determined with a calorimetric standard of pyridazine to be 0.00(6) (Al dimer), 0.16 (Al dimeric tautomer), 0.00(2) (AI-AcOH complex), 0.11 (AI-AcOH tautomer), and 0.08 (AI-methanol complex). By analyzing the time evolution of TRTL signals of AI dimer, the lifetime of the tautomer in the ground state was determined to be 19 mu s, which well agreed with the values obtained with flash photolysis andstepwise two-color laser-induced fluorescence experiments. The enthalpy change of the tautomer to the AI dimer in the ground state was obtained to be surprisingly low, 340 cm(-1). The TRTL results under high photon density excitation show that AT dimer easily absorbs second photon to dissociate into two monomeric tautomers followed by the recombination in ca. 2 ms.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/04/20 alle ore 02:38:12