Cu^(2+)敏感水溶性萘酰亚胺高分子荧光探针的合成及其光学性能

On the Synthesis and Optical Properties of Water-Soluble Naphthalimides Polymeric Fluorescent Probe Sensing for Cu(Ⅱ)

以1,8-萘二甲酸酐、二乙烯三胺(DETA)、N-甲基哌嗪及丙烯基氯为原料,通过酰胺化、季胺化、SN2亲核取代以及丙烯酰胺共聚合等反应,合成了水溶性1,8-萘酰亚胺高分子荧光探针。用紫外光谱、荧光光谱等手段研究它们在水、四氢呋喃和乙醇溶液中光物理化学性质,同时考察浓度和溶剂极性及取代基对荧光性能影响及对金属离子的识别作用。结果表明,此高分子荧光探针的光稳定性及荧光量子产率明显提高,随着溶剂极性增大,荧光量子产率增大,波长红移;当浓度超过8×10-4g/m L时出现荧光浓度自猝灭;该探针在水中能对Cu2+在392 nm处进行高选择性识别。

Water-soluble naphthalimide polymeric fluorescent probe（ referred to as PFP） were synthesized through amination, amidation and quaterisation, SN2 nucleophilic substitution,as well as copolymerization with acrylamide by using 1,8-naphthalic anhydride and diethylenetriamine, N-methyl piperazine and allyl chloride as raw materials. The photophysical and photochemical characteristics in aqueousx, tetrahydrofuran and ethanol were studied by ultraviolet ray absorption spectra and fluorescence emission spectra. The effect of concentration and polarity of solvents on fluorescence properties,and the recognition of metal ions were discussed. The results show that, light stability and fluorescence quantum yield of the polymeric fluorescent probe can be improved obviously, meanwhile the fluorescence quantum yield increases, fluorescence wavelength redshift with the increase of solvent polarity.Fluorescence self-quenching appears when the concentration exceeds the concentration of 8 × 10^-4g/m L.The polymeric fluorescent probe exhibited high selectivity for Cu^2＋ in aqueous solution at 392 nm.