A new rhodamine‐based fluorescent chemodosimeter for mercuric ions in water media. (25th July 2014)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Luminescence. Volume 30:Number 3(2015:May)
• Page Start: 325
• Page End: 329
• Publication Date: 2014-07-25
• Subjects: Luminescence -- Periodicals; Bioluminescence -- Periodicals; Chemiluminescence -- Periodicals; Luminescence -- Periodicals; 535.35
• DOI: 10.1002/bio.2733
• Languages: English
• ISSNs: 1522-7235

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <p>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 Hg²⁺ ions to the aqueous solution of the chemodosimeter RT caused a distinct fluorescence <italic>OFF–ON</italic> 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: Zn²⁺, Cu²⁺, Cd²⁺, Pb²⁺, Ag⁺, Fe²⁺, Cr³⁺, Co³⁺, Ni²⁺, Ca²⁺, Mg²⁺, K⁺ and Na⁺. The sensing results and the molecular structure suggested that a Hg²⁺‐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 Hg²⁺ ions in aqueous solution. Hg²⁺ 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 &amp; Sons, Ltd.</p> </abstract>