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A new rhodamine‐based fluorescent chemodosimeter for mercuric ions in water media
Author(s) -
Quy Phan Tu,
Hien Nguyen Khoa,
Bao Nguyen Chi,
Nhan Doan Thanh,
Khanh Dang Van,
Nhung Nguyen Thi Ai,
Tung Truong Quy,
Luyen Nguyen Dinh,
Quang Duong Tuan
Publication year - 2015
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2733
Subject(s) - chemistry , fluorescence , metal ions in aqueous solution , moiety , aqueous solution , photochemistry , rhodamine , thiourea , ethylenediamine , ion , fluorophore , bathochromic shift , inorganic chemistry , organic chemistry , physics , quantum mechanics
A new rhodamine–ethylenediamine–nitrothiourea conjugate (RT) was synthesized and its sensing property as a fluorescent chemodosimeter toward metal ions was explored in water media. Analytical results from absorption and fluorescence spectra revealed that the addition of Hg 2+ ions to the aqueous solution of the chemodosimeter RT caused a distinct fluorescence OFF–ON response with a remarkable visual color change from colorless to pink; however, no clear spectral and color changes were observed from other metal ions including: Zn 2+ , Cu 2+ , Cd 2+ , Pb 2+ , Ag + , Fe 2+ , Cr 3+ , Co 3+ , Ni 2+ , Ca 2+ , Mg 2+ , K + and Na + . The sensing results and the molecular structure suggested that a Hg 2+ ‐induced a desulfurization reaction and cyclic guanylation of the thiourea moiety followed by ring‐opening of the rhodamine spirolactam in RT are responsible for a distinct fluorescence turn‐on signal, indicating that RT is a remarkably sensitive and selective chemodosimeter for Hg 2+ ions in aqueous solution. Hg 2+ within a concentration range from 0.1 to 25 μM can be determined using RT as a chemodosimeter and a detection limit of 0.04 μM is achieved. Copyright © 2014 John Wiley & Sons, Ltd.