An EDTA promoted coordination induced disaggregation for specific Hg2+ detection. (February 2015)

• Record Type: Journal Article
• Authors: Zhu, Huijun; Fan, Juan; Chen, Hangqing; Tang, Zhenwei; Wang, Guimei; Fu, Nanyan
• Is Part Of: Dyes and pigments. Volume 113(2015)
• Page Start: 181
• Page End: 188
• Publication Date: 2015-02
• Subjects: Mercury -- EDTA -- Squaraine -- Disaggregation -- Fluorescent probe -- Dithiocarbamate; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2014.07.041
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: In this work, a novel fluorescent sensing strategy was developed for the detection of Hg 2+ with excellent sensitivity and selectivity using a metal-induced disaggregation of aggregated squaraine molecules with the help of ethylenediaminetetreaacetic acid (EDTA). This EDTA promoted probe exhibited a specific "turn on" fluorescent response to Hg 2+ with a detection limit of 7.6 × 10 −9 M (3 σ / k ). Owning to the high coordinating ability of EDTA and dithiocarbamate tethered squaraine dye toward Hg 2+, the disaggregation process could be improved by EDTA via the formation of squaraine-Hg 2+ -EDTA trinary complex, resulting in a greater fluorescent release, and this novel phenomenon has been confirmed by light scattering experiments, 1 H NMR, IR and MS. Graphical abstract: Highlights: An EDTA promoted fluorescent probe of Hg 2+ has been designed and synthesized. The sensing mechanism is based on coordination induced disaggregation of squaraine. The probe showed high selectivity and sensitivity. A trinary complex among squaraine, EDTA and Hg 2+ has been detected.