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A new Tb3+-selective fluorescent sensor based on 2-(5-(dimethylamino)naphthalen-1-ylsulfonyl)-N-henylhydrazinecarbothioamide

Journal
Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
Publisher
Elsevier
Publication Date
Jan 01, 2009
Volume
74
Issue
2
Identifiers
DOI: 10.1016/j.saa.2009.07.014
Keywords
License
Unknown

Abstract

Abstract A novel fluorescent chemosensor 2-(5-(dimethylamino)naphthalen-1-ylsulfonyl)-N-phenylhydrazinecarbothioamide (L) has been synthesized, which revealed an emission of 530 nm and when excited at 360 nm. The fluorescent probe undergoes a fluorescent emission intensity quenching upon binding to terbium ions in MeCN solution. The fluorescence quenching of L is attributed to the 1:1 complex formation between L and Tb(III) which has been utilized as the basis for the selective detection of Tb(III). The linear response range covers a concentration range of Tb(III) from 4.0 × 10 −7 to 1.0 × 10 −5 M and the detection limit is 1.4 × 10 −7 M. The association constant of the 1:1 complex formation for L–Tb +3 was calculated to be 6.01 × 10 6 M −1, and the fluorescent probe exhibits high selectivity over other common metal ions mono-, di-, and trivalent cations indicate good selectivity for Tb(III) ions over a large number of interfering cations.

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