A new Tb3+-selective fluorescent sensor based on 2-(5-(dimethylamino)naphthalen-1-ylsulfonyl)-N-henylhydrazinecarbothioamide
作者:M.R. Ganjali、B. Veismohammadi、M. Hosseini、P. Norouzi
DOI:10.1016/j.saa.2009.07.014
日期:2009.10
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 x 10(-7) to 1.0 x 10(-5) M and the detection limit is 1.4 x 10(-7) M. The association constant of the 1:1 complex formation for L-Tb+3 was calculated to be 6.01 x 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. (C) 2009 Elsevier B.V. All rights reserved.