Abstract: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 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.

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2+ fluorescence quenching behavior in aqueous MeCN solutions. The detection limit is 1.4 ppb with a working range of 1.8-15 ppb. -(WANICHACHEVA*, N.; KAMKAEW, A.; WATPATHOMSUB, S.; LEE, V. S.; GRUDPAN, K.; Chem. Lett. 39 (

A novel fluorometric sensor possessing two dansyl moieties based on 2-[3-(2-aminoethylsulfanyl)propylsulfanyl]ethanamine 1 was prepared by a ready synthetic approach using a conventional two-step synthesis. 1 exhibits highly sensitive and selective on–off Hg2+ fluorescence quenching behavior in aqueous acetonitrile solutions and is shown to discriminate various competing metal ions such as Cu2+, Ag+, Ca2+, Mn2+, Zn2+, Ba2+, Cd2+, Co2+, Na+, and K+ exhibiting a detection limit of 7 nM or 1.4 ppb with a working range of 1.8–15 ppb.

Pendant metalloporphyrin-functionalized polythiophenes serve as efficient catalysts for the practical heterogeneous electrochemical reduction of carbon dioxide under ambient conditions in aqueous media.