基于水溶性吲哚半菁染料的比值式pH探针

Ratio pH probe based on water-soluble hemicyanine cyanine dye

合成了一种基于水溶性吲哚半菁染料的比值式pH探针,能快速响应pH值的变化。pH在8.00～11.00范围内,在紫外可见吸收光谱中,吸收峰在390 nm处随着pH的升高吸收峰逐渐减弱,而在470 nm处随着pH的升高吸收峰逐渐增强,吸收强度之比(I470 nm/I390 nm)与pH有着良好的线性关系(R2=0.992 12),可用于检测pH的变化。

A ratio pH probe based on a water-soluble indolium hemicyanine was synthesized,which can quickly respond to the change of pH value.In the range of pH 8.00~11.00,the absorption at 390 nm weakened and at 470 nm increased with the increasing of pH in the UV-visible absorption spectrum.The ratio of absorption intensity(I470 nm/I390 nm)has a good linear relationship to pH(R2=0.992 12).It means that the probe can be used to detect the changes of pH.