维多利亚艳蓝及其缔合物可见光谱研究

研究维多利亚艳蓝(VPB)及其缔合物的可见光谱。研究了VPB与阴离子的显色反应;用作图法测定了VPB在水溶液中的质子传递常数;用等摩尔法和连续变化法测定了缔合物的组成和稳定常数。VPB 在酸性水溶液中呈浅黄色而缔合物呈艳蓝色。VPB BO，VPB R，VPB B和NB的pK_h分别为2.16，1.32，0.82和0.73。VPB BO与DBS，CdI₄]2-分别形成1∶1和2∶1离子对缔合物，K_f(稳定常数)分别为1.5×106,6.0×1012,表观摩尔吸光系数分别为4.7×104 L·mol-1·cm-1,2.8×105 L·mol-1·cm-1。VPB是一种分析性能优良的高灵敏显色剂。

Study on Visible Spectra of Victoria Pure Blue and Its Association Complexes

The visible spectrums of Victoria Pure Blue (VPB) and its association complexes were studied, and the chromogenic reaction of VPB with anions was also studied. The proton conduction constant of VPB in water solution was determined by plot method. The composition and stable constant were measured by equimolar continuous change method and the molar ratio method. The color of VPB in acid solution was light yellow while that of its association complex was pure blue. The pKh values of VPB BO, VPB R, VPB B and NB were 2.16, 1.32, 0.82 and 0.73 respectively. The molar ratio of association complex formed by the reaction of VPB BO with DBS was 1:1, while the ratio of VPB BO to CdI4]2- was 2:1. The Kf (Stability constant) value of the two compounds was 1.5 x 10(6) and 6.0 x 10(12) respectively. The apparent molar absorptivity of them was respectively 4.7 x 10(4) L x mol(-1) x cm(-1) and 2.8 x 10(5) L x mol(-1) x cm(-1). It is clear that VPB is a high-sensitivity chromogenic reagent with fine analytical properties.