新水溶性卟啉季铵盐的合成及与锌的显色反应研究

Synthesis of New Water-Soluble Porphyrin Quaternary Ammonium Salts and Study on their Color Reaction with Zinc

合成了一种新型水溶性吡啶卟啉季铵盐即溴化5-[(4-N-苄基)吡啶基]10,15,20-(4-N-吡啶基)卟啉,研究了该试剂与锌的显色反应。在pH2.5的邻苯二甲酸氢钾-盐酸缓冲溶液中,形成了配位比为1∶1的配合物,其最大吸收波长λ=424nm,表观摩尔吸光系数ε=2.03×105L.mol-1.cm-1。在0—1.2μg/10mL范围内吸光度与锌质量浓度关系符合比耳定律,该法灵敏度高、选择性好。本法应用于环境水试样中痕量锌离子的分析,结果令人满意。

A new water-soluble porphyrin quaternary ammonium salts was synthesized and characterized by ^1HMR,UV,IR and MS. The salt as color reagent reacts with Zn2＋ and forms a 1：1 color complex in pH 2. 5 solution at 100℃ for 15min. Beer＇s law was obeyed in the range of 0-1.2μg/10mL for Zn^2＋. The apparent molar absorptivity is 2.03）〈 10SL·mol^-1·cm^-1. This method has well selectivity and high sensitivity in photometric determination of micro Zn^2＋ in environmental water samples.