Ultrafast measurements of charge and excited-state intramolecular proton transfer in solutions of 4′-(N,N-dimethylamino) derivatives of 3-hydroxyflavone

被引：56

作者：

Ameer-Beg, S

Ormson, SM

Poteau, X

Brown, RG

Foggi, P

Bussotti, L

Neuwahl, FVR

机构：

[1] Univ Cent Lancashire, Ctr Photochem, Preston PR1 2HE, Lancs, England

[2] LENS, Florence, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 2004年 / 108卷 / 34期

关键词：

D O I：

10.1021/jp048512d

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：

Transient spectra for 4'-(N,N-dimethylamino)-3-hydroxy- (1a) and 4'-(N,N-dimethylamino)-3-methoxyflavone (2a) in several solvents at room temperature are reported following excitation with pulses of approximately 100 A fwhm. la exhibits emission from both the normal excited state and from the excited tautomer produced following excited-state intramolecular proton transfer (ESIPT). Rate constants for the ESIPT process are found to vary between 3.3 x 10(11) and 3 x 10(10) s(-1) depending on the solvent. Polar solvents are found to play a significant role in stabilizing the normal excited state of both 1a and 2a.

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收藏

页码：6938 / 6943

页数：6

相关论文

共 30 条

[21]

PIVOVARENKO VG, 1997, CELL MOL BIOL LETT, V2, P355

[22] The photophysics of some 3-hydroxyflavone derivatives in the presence of protons, alkali metal and alkaline earth cations [J].

Poteau, X ;

Saroja, G ;

Spies, C ;

Brown, RG .

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 2004, 162 (2-3) :431-439

[23] Tuning the mechanism of proton-transfer in a hydroxyflavone derivative [J].

Roshal, AD ;

Organero, JA ;

Douhal, A .

CHEMICAL PHYSICS LETTERS, 2003, 379 (1-2) :53-59

[24] Flavonols and crown-flavonols as metal cation chelators.: The different nature of Ba2+ and Mg2+ complexes [J].

Roshal, AD ;

Grigorovich, AV ;

Doroshenko, AO ;

Pivovarenko, VG ;

Demchenko, AP .

JOURNAL OF PHYSICAL CHEMISTRY A, 1998, 102 (29) :5907-5914

[25] DIRECT OBSERVATION OF FAST PROTON-TRANSFER - FEMTOSECOND PHOTOPHYSICS OF 3-HYDROXYFLAVONE [J].

SCHWARTZ, BJ ;

PETEANU, LA ;

HARRIS, CB .

JOURNAL OF PHYSICAL CHEMISTRY, 1992, 96 (09) :3591-3598

[26] Picosecond time-resolved fluorescence studies are consistent with reversible excited-state intramolecular proton transfer in 4′-(dialkylaminoe)-3-hydroxyflavones [J].

Shynkar, VV ;

Mély, Y ;

Duportail, G ;

Piémont, E ;

Klymchenko, AS ;

Demchenko, AP .

JOURNAL OF PHYSICAL CHEMISTRY A, 2003, 107 (45) :9522-9529

[27] PROTON-TRANSFER DYNAMICS IN SUBSTITUTED 3-HYDROXYFLAVONES - SOLVENT POLARIZATION EFFECTS [J].

SWINNEY, TC ;

KELLEY, DF .

JOURNAL OF CHEMICAL PHYSICS, 1993, 99 (01) :211-221

[28] INTERPLAY BETWEEN EXCITED-STATE INTRAMOLECULAR PROTON-TRANSFER AND CHARGE-TRANSFER IN FLAVONOLS AND THEIR USE AS PROTEIN-BINDING-SITE FLUORESCENCE PROBES [J].

SYTNIK, A ;

GORMIN, D ;

KASHA, M .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1994, 91 (25) :11968-11972

[29] Femto- and picosecond fluorescence studies of solvation and non-radiative deactivation of ionic styryl dyes in liquid solution [J].

van der Meer, MJ ;

Zhang, H ;

Rettig, W ;

Glasbeek, M .

CHEMICAL PHYSICS LETTERS, 2000, 320 (5-6) :673-680

[30]

Weast R., 1972, HDB CHEM PHYS, V53rd