Journal
TALANTA
Volume 119, Issue -, Pages 632-638Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2013.11.009
Keywords
Hexaazatriphenylene; Off-On; Chemsensor; Cd2+ ion
Categories
Funding
- 973 Program [2012CB821700]
- NSFC [21031002, 51073079]
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Two hexaazatriphenylene (HAT) derivatives, 2,3,6,7-tetramethyl-10,11-di(pyridin-2-yl)dipyrazino[2, 3f:2',3'-h]quinoxaline (1) and 2,3-dimethyl-6,7,10,11-tetra(pyridin-2-yl)dipyrazino[2,3-f:2',3'-h]quinoxaline (2), were designed and synthesized. Both 1 and 2 exhibited high off-on fluorescent selectivity for Cd2+ over many other metal ions, and the detection limits were determined to be 0.6 and 5.0 mu M, respectively. The stoichiometry and coordination mode of blue fluorescent 1-Cd2+ and cyan fluorescent 2-Cd2+ were determined with fluorescence titration fit, Job's plot analysis, H-1 NMR titration and X-ray crystallography, and the fluorescence enhancement mechanism was analyzed with density functional theory calculation. (C) 2013 Elsevier B.V. All rights reserved.
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