Abstract
The nucleophilic substitution reaction between the chloromethyl group of chloromethylated polystyrene(CMPS) and phenolic hydroxyl group of 3-nitro-4-hydroxy benzoic acid(NHBA) was conducted,and the nitro-benzoic acid(NBA) ligand was bonded on the side chains of polystyrene(PS) to yield nitro benzoic acid functionalization polystyrene PS-NBA.In this work,the nucleophilic substitution reaction between CMPS and NHBA was systematically investigated to optimize the reaction conditions.The coordination reaction between PS-NBA and Eu3 +ion was carried out to give polymer-rare earth complex,PS-(NBA) 3-Eu(Ⅲ).The chemical structure of PS-NBA was characterized by FTIR and1H NMR spectra and the florescence emission of PS-(NBA) 3-Eu(Ⅲ) was preliminarily examined.The results show that the nitro substitute group in benzene ring can reduce the rate of the substitution reaction.The stronger polarity solvents and higher reaction temperature(70 ℃) favor the substitution reaction.The ligand NBA on the side chain of the functionalized polymer PS-NBA can strongly sensitize the fluorescence-emission of Eu3 +ion,and its sensibilization is much stronger than that of benzoic acid(BA) ligand.The polymer-rare earth complex PS-(NBA) 3-Eu(Ⅲ) possesses much stronger fluorescence emission intensity than PS-(BA) 3-Eu(Ⅲ).
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