Reversible colorimetric probes for mercury sensing

被引:315
作者
Coronado, E
Galán-Mascaros, JR
Martí-Gastaldo, C
Palomares, E [1 ]
Durrant, JR
Vilar, R
Gratzel, M
Nazeeruddin, MK
机构
[1] Univ Valencia, IcMol, E-46100 Burjassot, Spain
[2] Univ London Imperial Coll Sci & Technol, Dept Chem, Ctr Elect Mat & Devices, London SW7 2AY, England
[3] Inst Chem Res Catalonia ICIQ, Tarragona 43007, Spain
[4] ICREA, Tarragona 43007, Spain
[5] Swiss Fed Inst Technol, Sch Basic Sci, Lab Photon & Interfaces, Inst Mol & Biol Chem, CH-1015 Lausanne, Switzerland
关键词
D O I
10.1021/ja0517724
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The selectivity and sensitivity of two colorimetric sensors based on the ruthenium complexes N719 [bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) bis(tetrabutylammonium) bis(thiocyanate)] and N749 [(2,2': 6',2 ''-terpyridine-4,4', 4 ''-tricarboxylate) ruthenium (11) tris(tetrabutylammonium) tris(isothiocyanate)] are described. It was found that mercury ions coordinate reversibly to the sulfur atom of the dyes' NCS groups. This interaction induces a color change in the dyes at submicromolar concentrations of mercury, Furthermore, the color change of these dyes is selective for mercury(II) when compared with other ions such as lead(II), cadmium(II), zinc(II), or iron(II). The detection limit for mercury(II) ions-using UV-vis spectroscopy-in homogeneous aqueous solutions is estimated to be similar to 20 ppb for N719 and similar to 150 ppb for N749. Moreover, the sensor molecules can be adsorbed onto high-surface-area mesoporous metal oxide films, allowing reversible heterogeneous sensing of mercury ions in aqueous solution. The results shown herein have important implications in the development of new reversible colorimetric sensors for the fast, easy, and selective detection and monitoring of mercuric ions in aqueous solutions.
引用
收藏
页码:12351 / 12356
页数:6
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