A Cu(i)–I coordination polymer fluorescent chemosensor with amino-rich sites for nitro aromatic compound (NAC) detection in water†
Abstract
A fluorescent coordination polymer with formula [Cu2I2(MA)2] (MA = melamine) (1) was prepared via a solvothermal method. The nanometer size of 1 was obtained by the nanoprecipitation method. Compound 1 features a 1-D double [Cu2I2] chain anchoring the MA molecules on both sides of the chain with uncoordinated amino and heterocyclic nitrogen groups as recognition sites to interact with guest molecules. Compound 1 exhibits excellent thermal stability and is also stable in acidic and basic media. As a fluorescent sensor, compound 1 was successfully used for the detection of NACs such as 2,4,6-trinitrophenol (TNP), nitrobenzene (NB), p-nitrophenol (4-NP), 2,4-dinitrotoluene (2,4-DNT), and 2,4-dinitrophenol (2,4-DNP) in aqueous media by fluorescence quenching. The quenching sequence is TNP > 2,4-DNP > 2,4-DNT > 4-NP > NB. Furthermore, the sensing sensitivity increased as the particle size of 1 decreased. The limit of detection for TNP is 0.717 μM. We also discuss the probable quenching mechanism based on the theoretical calculations and UV-vis absorption spectroscopy.
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