Chinese Journal of Applied Chemistry

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Synthesis of Benzoic Acid Derivative-Bonded Polystyrene Ligand and Photoluminescence Properties of Its Complex with Eu(Ⅲ) Ion

XU Zeqing, GAO Baojiao*, HOU Xiaodong   

  1. (Department of Chemical Engineering,North University of China,Taiyuan 030051,China)
  • Received:2013-04-16 Revised:2013-05-28 Published:2014-02-10 Online:2014-02-10

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 and 1H 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).

Key words: polystyrene, nitro-benzoic acid ligand, nucleophilic substitution, polymer-rare earth complex, fluorescence- emission, sensibilization

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