新试剂4-(2-吡啶偶氮)-邻苯三酚的合成及其与钴(Ⅱ)的显色反应  

Synthesis of a new reagent 4-(2-pyridylazo)-pyrogallol and its colour reaction with cobalt(Ⅱ)

作　　者：史传国[1] 姚成[2] 

机构地区：[1]南通师范学院化学系,南通226007 [2]南京工业大学理学院,南京210009

出　　处：《分析试验室》2004年第3期50-52,共3页Chinese Journal of Analysis Laboratory

基　　金：江苏省科技厅自然科学基金资助课题(BK2001131);江苏省教育厅资助课题(02KJD150008)

摘　　要：报道了水溶性新显色剂4 (2 吡啶偶氮) 邻苯三酚(PAPG)的合成。在溴化十六烷基三甲基铵(CTMAB)存在下的碱性介质中,试剂与Co(Ⅱ)形成稳定的蓝紫色配合物,其最大吸收波长(λmax)625nm,对比度(Δλ)171nm,表观摩尔吸光系数(ε625)1.47×104L·mol-1·cm-1。钴的质量浓度在0～0.72mg L范围内服从比耳定律。已用于维生素B12中钴的测定。The synthesis of a new water-soluble chromogenic reagent 4-(2-pyridylazo)-pyrogallol(PAPG) was described. In the buffer solution at pH 9.0～11.0 a stable 1∶2 blue purple complex of PAPG and Co(Ⅱ) was formed in the presence of CTMAB, which gave a maximum absorption at 625 nm with contrast(Δ λ ) of 171 nm and apparent molar absorbtivity of 1.47×10~4 L·mol^(-1)·cm^(-1). Beer′s law was obeyed in the range of 0 to 0.72 mg/L for Co(Ⅱ). Satisfactory results were obtained in the determination of cobalt in VB_(12).

关 键 词：4-(2-吡啶偶氮)-邻苯三酚 合成 钴(Ⅱ) 含量测定 显色反应 显色剂 分光光度法 邻苯三酚偶氮类试剂 

分 类 号：O614.812[理学—无机化学] TQ421.3[理学—化学]