萘酰亚胺接枝壳聚糖Al^(3+)荧光探针的合成及光谱性能研究

Synthesis and Spectral Properties of Naphthalimide Grafted Chitosan Fluorescent Probe for Aluminum Ion

以1,8-萘酰亚胺、壳聚糖、盐酸吗啉胍为原料,通过酰亚胺化、席夫碱等反应,设计合成了一种萘酰亚胺接枝壳聚糖类增强型荧光探针(NCFP)。采用红外、核磁共振等技术对其结构进行表征,利用荧光光谱研究了其光谱性能及对金属离子的识别作用。研究结果表明,合成的荧光探针对Al^(3+)具有较高的选择识别性能,且受常见离子的干扰较小。探针的荧光强度与Al^(3+)浓度(29.90~253.41μmol/L)有良好的线性关系,线性相关系数R^2=0.997 9,Al^(3+)的最低检出限达4.279μmol/L,Job's曲线表明,荧光探针与Al^(3+)的络合比为1∶1。

A fluorescent enhancement probe(for short:NCFP)was designed and synthesized based on the naphthalene imide derivatives grafted chitosan through imidization,schiff base reaction,and so on by using 1,8-naphthalene anhydride,chitosan,moroxydine hydrochloride as raw materials.The structure of the fluorescent probe was characterized by 1H NMR,FI-IR method,the spectral properties and identification of metal ions were studied with fluorescence spectroscopy.The results indicate that the fluorescent probe has strong uorescence responses to Al 3+,and remarkably high selectivity to Al 3+than other metal ions.When the concentration of Al 3+is in the range of 29.90-253.41μmol/L,there is a good linearity between the fluorescence intensity of the probe and the concentration of Al 3+.Linear correlation coefficient R 2=0.997 9,the detection limit of the probe is 4.279μmol/L to Al 3+.The complexation ratio of probe/Al 3+is 1∶1 from the method of Job s plot by fluorescence pectrophotometry.