一种pH荧光特性物质的合成及其特性研究

合成并表征了化合物:N,N'-二苯丙氨酸铵-3,4,9,10-苝四羧酸二酰亚胺(PDCDA).研究了pH值变化对其水溶液可见吸收光谱和荧光发射光谱的影响,探讨了荧光强度变化的机理,并利用PDCDA构建了具有“开-关”特性的pH荧光传感器.结果表明,PDCDA化合物水溶性好、荧光量子产率高,荧光强度与pH值间有着强烈的依赖关系,在碱性及中性溶液中荧光强度较强且稳定,而在酸性溶液中荧光被淬灭,PDCDA在一个非常窄的pH范围内荧光强度发生了明显的变化, pH值的改变对发光团π-π堆积产生影响进而导致其荧光发射光谱和可见吸收光谱发生改变.PDCDA可用作水溶液的pH荧光传感器,检测pH值范围为3.8~6.3.

Synthesis and characterization of a pH fluorescence compound.

N,N’-bi(L-phenylalanine amine)-perylene-3,4;9,10-dicarboxylic diimide(PDCDA)was synthesized and characterized.The absorbance and fluorescence of PDCDA(10-5 mol/L) in aqueous solution were studied by varied pH values.The mechanism of the fluorescence indensity change was also discussed.And a fluorescent pH sensor was designed with PDCDA.It was water-soluble and had high fluorescent quantum yield.The fluorescence intensity of PDCDA was strongly dependent on pH,which was strong and stable in alkaline or neutral solution and was weakened in acid solution.The fluorescence intensity of PDCDA changed obviously even in a small pH range.The π-π stacking caused by pH led to the change of flourescence spectrum and absorption spectrum.The PDCDA can be used as a fluorescent pH sensor and the pH detection range was 3.8~6.3.