Characterization of a novel crown ether-bearing near-infrared heptamethine cyanine dye. A study of fluorescence quenching by lithium

被引：20

作者：

Tarazi, L ^{[1
]}

Choi, H ^{[1
]}

Mason, JC ^{[1
]}

Sowell, J ^{[1
]}

Strekowski, L ^{[1
]}

Patonay, G ^{[1
]}

机构：

[1] Georgia State Univ, Dept Chem, Atlanta, GA 30303 USA

来源：

MICROCHEMICAL JOURNAL | 2002年 / 72卷 / 01期

关键词：

spectral characteristics; crown ether-bearing heptamethine cyanine dye; lithium ion;

D O I：

10.1016/S0026-265X(01)00150-3

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The spectral characteristics of a crown ether-bearing heptamethine cyanine dye (JCM-15C5) and its quenching by lithium ion are reported. The absorbance maximum of the dye is at 776 nm in acetonitrile. This value matches the output of a commercially available laser diode (780 nm), thus making use of such a source practical for excitation. The emission wavelength of the dye in acetonitrile is at 799 urn. It was found that Li+ ion selectively quenches the fluorescence intensity of JCM-15C5 by the static quenching mechanism. The Stern-Volmer quenching constant (K-sv) was calculated from the Stern-Volmer plot and found to be 1.17 X 10(7) M-1 at room temperature. The detection limit for Li+ ion was found to be 7.43 X 10(-1) ppb. The stability constant (K-s) of the metal-dye complex was determined by fluorometric titration and found to be 5.40 X 10(7) M-1. (C) 2002 Elsevier Science B.V. All tights reserved.

引用

页码：55 / 62

页数：8

共 32 条

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