Excited-state dynamics in 8-hydroxyquinoline dimers

被引：14

作者：

Cheatum, CM ^{[1
]}

Heckscher, MM ^{[1
]}

Crim, FF ^{[1
]}

机构：

[1] Univ Wisconsin, Dept Chem, Madison, WI 53706 USA

来源：

CHEMICAL PHYSICS LETTERS | 2001年 / 349卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0009-2614(01)01173-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Electronic excitation of the 8-hydroxyquinoline dimer in cyclohexane induces a transient electronic absorption at wavelengths from 400 to 530 rim with a 1.7 +/- 0.2-ps single exponential decay. The similarity between 8-hydroxyquinoline and 7-azaindole, a widely studied excited-state proton transfer system, suggests that the decay reflects the excited-state proton transfer. Measurements on the deuterated dimer show no kinetic isotope effect, which is consistent with previous studies concluding that the proton transfer in 8-hydroxyquinoline is barrierless. These results suggest that excited-state proton transfer takes only a few picoseconds in 8-hydroxyquinoline dimers. (C) 2001 Elsevier Science B.V. All rights reserved.

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页码：37 / 42

页数：6

相关论文

共 23 条

[1] EXCITED-STATE PROTON-TRANSFER REACTIONS .1. FUNDAMENTALS AND INTERMOLECULAR REACTIONS [J].

ARNAUT, LG ;

FORMOSINHO, SJ .

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 1993, 75 (01) :1-20

[2] Excited-state processes in 8-hydroxyquinoline: Photoinduced tautomerization and solvation effects [J].

Bardez, E ;

Devol, I ;

Larrey, B ;

Valeur, B .

JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (39) :7786-7793

[3] PHOTOINDUCED COUPLED PROTON AND ELECTRON TRANSFERS .1. 6-HYDROXYQUINOLINE [J].

BARDEZ, E ;

CHATELAIN, A ;

LARREY, B ;

VALEUR, B .

JOURNAL OF PHYSICAL CHEMISTRY, 1994, 98 (09) :2357-2366

[4]

Bardez E, 1999, ISRAEL J CHEM, V39, P319

[5] Transient electronic absorption of vibrationally excited CH2I2:: Watching energy flow in solution [J].

Bingemann, D ;

King, AM ;

Crim, FF .

JOURNAL OF CHEMICAL PHYSICS, 2000, 113 (12) :5018-5025

[6] Conformity of the 7-azaindole dimer cationic potential with photoionization/Coulomb-explosion MS observations and the concerted biprotonic transfer mechanism [J].

Catalán, J ;

del Valle, JC ;

Kasha, M .

CHEMICAL PHYSICS LETTERS, 2000, 318 (06) :629-636

[7] Photophysics of 7-azaindole, its doubly-H-bonded base-pair, and corresponding proton-transfer-tautomer dimeric species, via defining experimental and theoretical results [J].

Catalán, J ;

Kasha, M .

JOURNAL OF PHYSICAL CHEMISTRY A, 2000, 104 (46) :10812-10820

[8] On the experimental evidences for 7-azaindole base-pair model ultrafast phototautomerization [J].

Douhal, A ;

Moreno, M ;

Lluch, JM .

CHEMICAL PHYSICS LETTERS, 2000, 324 (1-3) :81-87

[9] On the theoretical reports on 7-azaindole base-pair phototautomerization [J].

Douhal, A ;

Moreno, M ;

Lluch, JM .

CHEMICAL PHYSICS LETTERS, 2000, 324 (1-3) :75-80

[10] Femtosecond dynamics of double proton transfer in a model DNA base pair: 7-azaindole dimers in the condensed phase [J].

Fiebig, T ;

Chachisvilis, M ;

Manger, M ;

Zewail, AH ;

Douhal, A ;

Garcia-Ochoa, I ;

Ayuso, ADH .

JOURNAL OF PHYSICAL CHEMISTRY A, 1999, 103 (37) :7419-7431