喹啉盐与吡啶盐花青染料分子酸致变色行为的研究

Study on the Acidichromism Behaviors of Quinoline and Pyridine Derivatives

花青染料结构上的特点是共轭链上带有吸电子和给电子基团,色泽大多呈红、橙红色且摩尔吸光度大。由于吸电子和给电子基团均含有氮原子,对质子很是敏感,具有很好的酸致变色特性。当外来物种的侵入改变吸、供电子基团的电子结构后,往往改变了这种吸收光能的性质从而达到光开关的作用。本文分别研究了吡啶盐花青染料与喹啉盐花青染料分子以及在βˉ环糊精包络后酸致变色行为的变化。结果表明这类分子经βˉ环糊精包络前、后均具有较好的酸致变色性能。

UV-visible absorption and fluorescence of two cyanine dyes （PSPI and PSQI） in DMF were measured. Their acidichromism properties were investigated. The maximum absorption peak of PSPI is at 328 nm with the pH=2, which shows colorless. With the increasing of pH value to 3, the maximum absorption peak in the lower energy region is red shifted to 458 nm. These suggest that optical switch point is located between 2 and 3 of pH value. Moreover, the acidichromism of PSPI in the presence of β-CD is clearer than that of PSPI without β-CD.