A novel Eu(III)-based luminescent chemosensor: determining pH in a highly acidic environment

被引：82

作者：

Gunnlaugsson, T ^{[1
]}

机构：

[1] Univ Dublin Trinity Coll, Dept Chem, Dublin 2, Ireland

来源：

TETRAHEDRON LETTERS | 2001年 / 42卷 / 50期

关键词：

D O I：

10.1016/S0040-4039(01)01935-9

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

The design, synthesis and photophysical evaluation of the Eu(III)-based chemosensor [Eu .1], is described. The sensors show large (ca. 300 fold) pH dependent luminescence enhancements for the Eu(III) lanthanide emission, i.e. it is 'switched on' in highly acidic media, between pH ca. 1.5 and 3.5 with a pK(a) of 2.4 (+/-0.1) when excited at 350 nm. The fluorescence spectra of [Eu .1], consisting of the quinoline emission, is also pH dependent, where the fluorescence is 'switched on' at 458 nm, in the pH region of 3-6, but the emission is quenched between pH 1.5 and 3. Both pH-intensity profiles display an 'off-on-off' bell-shape behaviour similar to that seen for many enzymatic pH dependent processes. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：8901 / 8905

页数：5

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