Photophysics of calixarenes bearing two or four dansyl fluorophores:: charge, proton and energy transfers

被引：52

作者：

Métivier, R

Leray, I

Valeur, B

机构：

[1] ENS Cachan, Dept Chim, Lab Photophys & Photochim Supramol & Macromol, CNRS,UMR 8531, F-94235 Cachan, France

[2] Conservatoire Natl Arts & Metiers, Lab Chim Gen, F-75141 Paris, France

来源：

PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES | 2004年 / 3卷 / 04期

关键词：

D O I：

10.1039/b314674j

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The photophysical properties of calixarenes bearing two and four dansyl derivatives (Calix-DANS2 and Calix-DANS4) were investigated in a CH3CN/H2O mixture ( 60 : 40 v/v). The carboxydansyl (DANS1) was used as a reference compound. The pH titration of DANS1 permits determination of two pK(A) values (2.4 and 6.3). The charge-transfer character of this type of fluorophore is discussed. The protonated dansyl group LH2+ undergoes photoinduced proton transfer. The photophysical characterization ( absorption spectra, emission spectra, quantum yield and fluorescence decays) of Calix-DANS2 and Calix-DANS4 showed that nonradiative energy transfer occurs from a dansyl. uorophore in the basic form to another one in the neutral form. The transfer efficiencies are 0.1 and 0.5 for Calix-DANS2 and Calix-DANS4, respectively. Fluorescence data analysis allowed us to determine the fractions of dansyl fluorophores in the basic and neutral forms.

引用

页码：374 / 380

页数：7

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