一种新尾式卟啉吡啶季铵盐对锌离子显色反应的研究

Study on the Colour Reaction of Zinc (Ⅱ) with a New Tailed Porphyrin Pyridine Quaternary Ammonium Salt

本文研究了一种新型尾式卟啉吡啶季铵盐５－［４－（４－吡啶丁氧基）苯基］－１０，１５，２０－三（４－氯苯基）卟啉溴化物与锌的反应条件。ｐＨ＝１０．０，在吡啶存在下，于沸水浴中加热１５ｍｉｎ，其与Ｚｎ２＋形成１∶１配合物，其最大吸收波长位于４２８．６ｎｍ，在此条件下试剂的最大吸收波长在４１８．２ｎｍ，相差１０ｎｍ，配合物摩尔吸光系数４．６４×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，锌在０—１．２μｇ／１０ｍＬ范围内符合比耳定律，相关系数ｒ＝０．９８８８，本法是目前报道的分光光度法测定锌的最灵敏方法之一。

The reactive condition of a new tailed porphyrin pyridine quaternary ammonium salt5 [4 (4 pyridinium butoxy) phenyl] 10, 15, 20 tri(4 chlorophenyl) porphyrin bromide with Zinc (Ⅱ) was studied. The complex is formed on the condition of pH=10.0, pyridine and boiling water bath for 15 min. The warelength of maximum absorbance of complex lies at 428.6nm,reagent lies at 418.2nm. The contrast is about 10nm. The molar absorptivity is 4.64×10 5L·mol -1 ·cm -1 .Beer's law is obeyed in the range of 0-1.2μg/10mL for zinc(Ⅱ). Correlation coefficient is 0.9888. It is one of the most sensitive methods in determination of zinc that have ever been reported in spectrophotometry.