The Effect of a Mild Base on Curcumin in Methanol and Ethanol

被引：31

作者：

Erez, Yuval ^{[1
]}

Presiado, Itay ^{[1
]}

Gepshtein, Rinat ^{[1
]}

Huppert, Dan ^{[1
]}

机构：

[1] Tel Aviv Univ, Sch Chem, Raymond & Beverly Sackler Fac Exact Sci, IL-69978 Tel Aviv, Israel

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 2012年 / 116卷 / 09期

基金：

以色列科学基金会;

关键词：

PROTON-TRANSFER; SOLVATION DYNAMICS; ATOM TRANSFER; PHOTOPHYSICS;

D O I：

10.1021/jp300003a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

Steady-state and time-resolved emission techniques were employed to study the effect of acetate, a mild base, on the luminescence of curcumin in methanol and ethanol. We found that the steady-state emission intensity as well as the average fluorescence decay time are reduced by a factor of 5 when the acetate concentration is raised to about 1.8 M. We attribute this large effect to an excited-state proton transfer (ESPT) from the acidic groups of curcumin to the acetate anion. We analyze the experimental data in terms of an ESPT reaction occurring between a photoacid and a base.

引用

页码：2039 / 2048

页数：10

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