A fluorescent zinc–pamoate coordination polymer for highly selective sensing of 2,4,6-trinitrophenol and Cu2+ ion

TLDR: In this article, a two-dimensional zinc-pamoate coordination polymer (Zn(PAM) en) was synthesized under hydrothermal conditions and the strong emission of 1 was quenched efficiently by adding trace amounts of 2,4,6-trinitrophenol (TNP).

Abstract: A luminescent two-dimensional zinc–pamoate coordination polymer, [Zn(PAM)(en)] ( 1 ) (PAM = 4,4′-methylenebis(3-hydroxy-2-naphthalenecarboxylate), en = 1,2-ethanediamine) has been synthesized under hydrothermal conditions. The strong emission of 1 was quenched efficiently by adding trace amounts of 2,4,6-trinitrophenol (TNP), even in the presence of other interfering analytes such as 4-nitrophenol, 2,6-dinitrotoluene, 2,4-dinitrotoluene, nitrobenzene, 1,3-dinitrobenzene, hydroquinone, dimethylbenzene and bromobenzene, which exhibited superior selectivity of 1 for the detection of TNP via a fluorescence quenching mechanism. Similarly, 1 also exhibited unique selectivity and sensitivity toward Cu 2+ compared to other metal cations such as Zn 2+ , Mn 2+ , Mg 2+ , K + , Na + , Ni 2+ , Co 2+ and Ca 2+ . This reveals compound 1 can be used as a dual luminescence sensor for the detection of TNP and Cu 2+ alternatively.