Coumarin-based luminescent ligand that forms helicates with dicationic metal ions

被引:27
作者
Bullock, Sam J. [2 ]
Felton, Cara E. [2 ]
Fennessy, Rebecca V. [2 ]
Harding, Lindsay P. [2 ]
Andrews, Michael [1 ]
Pope, Simon J. A. [1 ]
Rice, Craig R. [2 ]
Riis-Johannessen, T. [3 ]
机构
[1] Cardiff Univ, Sch Chem, Cardiff CF10 3AT, S Glam, Wales
[2] Univ Huddersfield, Dept Chem & Biol Sci, Huddersfield HD1 3DH, W Yorkshire, England
[3] EPFL SB ISIC LCS, CH-1015 Lausanne, Switzerland
基金
英国工程与自然科学研究理事会;
关键词
FLUORESCENT CHEMOSENSOR; COORDINATION CHEMISTRY; LANTHANIDE IONS; COMPLEXES; RECOGNITION; ZINC; BEARING; INDICATORS; SENSORS; PYRIDYL;
D O I
10.1039/b913103e
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The potentially hexadentate ligand L, which contains two terminal coumarin fluorophores, forms dinuclear double-stranded helicates with dicationic metal ions, giving species of the generic form [M2L2](4+). In solution the free ligand was fluorescent with emission attributed to the coumarin fluorophores (lambda(em) = 437 nm). The luminescent properties of the corresponding dimetallic helicates complexes were examined and revealed that the Zn2+ complex demonstrates enhanced emission when compared to the parent ligand, whereas Co2+, Cu2+, Cd2+ and Hg2+ induce varying degrees of fluorescence quenching. In particular, comparative luminescence measurements at 77 K and room temperature showed that the quenching mechanism for [Cu2L2](4+) can be attributed to a photoinduced electron transfer. ESI-MS selectivity studies showed that in the presence of a mixture of metal dications no preference for any one metal ion was observed.
引用
收藏
页码:10570 / 10573
页数:4
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