Development of a novel sensing material, poly(γ-glutaniic acid) grafted benzoxazine (γ-PGA-g-Bzx), for transition metal(II) ions

Summary form only given. A novel ion sensing material was developed from γ-PGA-g-Bzx. The benzoxazine as anionophore segment was grafted into γ-PGA backbone via esterification reaction, which is a simple and effective reaction. The optimum reaction time determined by FTIR technique was 3 hours. The most attainable degree of conversion was 30%, evaluated by ¹H NMR technique. Among Co(II), Cu(II), Ni(II) and Zn(II) ions, the γ-PGA-g-Bzx showed a highly selective and sensitive recognition toward Cu(II) during observation with the necked-eyes. The Cu(II) ions sensing property of γ-PGA-g-Bzx was further examined by using photometric titration method. The γ-PGA-g-Bzx dissolved in dimethylsulfoxide was changed from clear and colorless to yellow, resulting in the shift of the maximum wavelength from UV to visible range. In addition, γ-PGA-g-Bzx exhibited the excellent interaction with Cu(II) ions at stoichiometric ratio 1:390.