1-(3-硝基苯基)-3-[4-(苯基偶氮)苯基]-三氮烯与阳离子表面活性剂显色反应的研究及应用

Study on the chromogenic reaction of 1-(3-Nitrophenyl)-3-(4-phenylazophenyl) triazene with cationic surfactants and their applications

在NaOH碱性介质中,1 (3 硝基苯基) 3 [4 (苯基偶氮)苯基] 三氮烯(m NPPAPT)分别与阳离子表面活性剂(CS)溴化十六烷基三甲铵(CTMAB)、溴化十二烷基二甲基苄铵(DDMBAB)、溴化十六烷基吡啶(CPB)和溴化十四烷基吡啶(TPB)反应显色形成离子配合物,它们与m NPPAPT形成离子配合物比均为2∶1。CTMAB、CPB、TPB、DDMBAB与m NPPAPT形成配合物最大吸收波长分别位于538、538、625、637nm,表观摩尔吸光系数达(103～104)L·mol-1·cm-1。研究了测定微量阳离子表面活性剂的条件,建立了新的分析方法,并应用于实样分析。

The chromogenic complexes of ion association of 1-(4-Nitrophenyl)-3-(4-phenyl-azophenyl) triazene (m-NPPAPT) with cethyltrimethylammonium bromide (CTMAB), dodecyldimethylbenzylammo-nium bromide (DDMBAB), cetylpyrid-inium and bromide (CPB) tetradecylpyridinium bromide (TPB) were formed in the NaOH basic medium, respectively. Their association ratio with m-NPPAPT is 2∶1. The maximum absorption wavelength of the complexes for m-NPPAPT-CTMAB, m-NPPAPT-CPB, m-NPPAPT-TPB and m-NPPAPT-DDMBAB is at 538, 538, 625, 637 nm, respectively. The apparent molar absorptivity of chromogenic complexes is 10~3～10~4 L·mol^(-1)·cm^(-1). The method for the determination of trace CTMAB,DDMBAB,CPB and TPB was proposed. It has been applied to analysis of the sample with satisfactory results.