本实验室新近借Mannich反应使邻苯二酚紫(PV)与亚氨基二乙酸及甲醛缩合,合成了邻苯二酚磺酞络合腙(PSC)。该试剂与铋(Ⅲ)形成1:2红色络合物(λ_(max)为505nm,ε为2.15×10~4),ε值稍高于结构较接近的二甲酚橙(XO;ε为1.16×10~4)及其母体PV(ε为1.37×10~4)。用PSC作铋的络合滴定指示剂,终点易于观察。本文对PSC用作铋的分析试剂进行了实验探讨。 Recently, Mannich reaction catalyzed the condensation of pyrocatechol violet (PV) with iminodiacetic acid and formaldehyde to synthesize catechol sulfadiazine complex hydrazone (PSC). The reagent formed a 1: 2 red complex with bismuth (λ = 505 nm, ε = 2.15 × 10 ~ 4) and the ε value was slightly higher than that of xylenol orange 1.16 × 10 ~ 4) and its parent PV (ε = 1.37 × 10 ~ 4). PSC as bismuth complex titration indicator, the end point is easy to observe. In this paper, PSC was used as an analytical reagent of bismuth.