Synthesis of a novel fluorescent sensor bearing dansyl fluorophores for the highly selective detection of mercury (II) ions

• Main Authors: Wanichacheva N., Watpathomsub S., Lee V., Grudpan K.
• Format: Journal
• Published: 2017
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=77950359995&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/43333
• Institution: Chiang Mai University

A new macromolecule possessing two dansyl moieties and based on 2-[4-(2-aminoethylthio)butylthio]ethanamine was prepared as a fluorescent sensor and its mercury sensing properties toward various transition metal, alkali, and alkali earth ions were investigated. The designed compound exhibited pronounced Hg 2+ -selective ON-OFF type fluorescence switching upon binding. The new compound provided highly selective sensing to Hg 2+ in acetonitrile-water solvent mixtures with a detection limit of 2.49 x 10 -7 M or 50 ppb. The molecular modeling results indicated that ions-recognition of the sensor originated from a self assembly process of the reagent and Hg 2+ to form a helical wrapping structure with the favorable electrostatic interactions of Hg 2+ coordinated with sulfur, oxygen, nitrogen atoms and aromatic moieties. © 2010 by the authors.