Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 105, Issue -, Pages 8-13Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2012.11.113
Keywords
1,8-Naphthalimide; Colorimetric; Fluorescent sensor; Fluorescence sensor; He2+
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Funding
- National Natural Science Foundation of China [21074085]
- open research foundation of the National Engineering Laboratory for Modern Silk, Soochow University [SS115801]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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A new fluorescent molecule 4-(bis(2-(ethylthio)ethyl)amino)-N-n-butyl-1,8-naphthalimide (BTABN) was reported. Its UV-vis absorption and fluorescence spectra were almost not dependent on the pH, but remarkably and selectively affected by Hg2+. Upon the addition of Hg2+ in EtOH/H2O (1/2, v/v), the absorption wavelength maxima were blueshifted from 436 nm to 376 nm with a naked-eye observed color change, and the fluorescence was greatly enhanced with a 14 nm blueshift within 1 min. Na+, K+, Ca2+, Mg2+, Cu2+, Zn2+, Cr3+, Pb2+, Ni2+, Fe2+, Mn2+, Co2+, Cd2+ showed no obvious interferences with the detection. The binding stoichiometry indicates that a 1:1 complex is formed between Hg2+ and BTABN. The response of the UV-vis absorption and the fluorescence spectra to He can be attributed to the joint contribution of the PET and ICT process. (C) 2012 Elsevier B.V. All rights reserved.
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