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首页> 外文期刊>Dyes and Pigments >Study of the interaction phenomena of cetyl-trimethyl-ammonium bromide,cetylpyridinium chloride and benzethonium chloride with C.I.Acid Orange 52 and picric acid by two spectral methods
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Study of the interaction phenomena of cetyl-trimethyl-ammonium bromide,cetylpyridinium chloride and benzethonium chloride with C.I.Acid Orange 52 and picric acid by two spectral methods

机译：两种光谱法研究十六烷基三甲基溴化铵，十六烷基氯化吡啶鎓和苄索氯铵与C.I.酸橙52和苦味酸的相互作用

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摘要

A study of solutions containing C.I.Acid Orange 52 (AO52) or picric acid (PA) and cationic surfactants in various molar ratios by UV-vis spectrophotometry and ion pair extraction spectrophotometry has been made.Cetyl-trimethyl-ammonium bromide (CTAB),cetylpyridinium chloride (CPC) and benzethonium chloride (BEC) have been chosen as cationic surfactants.AO52 and PA have been used as substances with coloured organic anion.The study focuses on investigation of solutions containing AO52 or PA in molar excess over the surfactants.The results show significant changes of absorption maxima in solutions of CTAB or CPC and AO52.The changes of absorption maxima in the case of AO52 excess are ascribed to the formation of associates soluble in water but insoluble in non-polar solvents.This process influences negatively the equilibrium of the ion pair formation.Consequently the amount of the ion pairs extracted during the ion pair extraction spectrophotometry is lowered and a hypochromic shift is recorded as the excess of the dye is increased.Therefore it may be concluded that the results of the ion pair extraction spectrophotometry and the direct UV-vis measurement correspond to each other as far as the systems CTAB + AO52 and CPC + AO52 are concerned.The PA excess does not cause any spectral shifts.Thus,this is in the agreement with the results of the ion pair extraction spectrophotometry,since the excess of PA does not influence the absorbance of the extracted ion pairs.
机译：通过紫外可见分光光度法和离子对萃取分光光度法研究了含有不同摩尔比的CIAcid Orange 52（AO52）或苦味酸（PA）和阳离子表面活性剂的溶液。氯化物（CPC）和苄索氯铵（BEC）被选作阳离子表面活性剂，AO52和PA被用作有色有机阴离子的物质，本研究着重研究摩尔比表面活性剂过量的AO52或PA溶液。表现出在CTAB或CPC和AO52溶液中吸收最大值的显着变化。在AO52过量的情况下，吸收最大值的变化归因于可溶于水但不溶于非极性溶剂的缔合物的形成。此过程对平衡产生负面影响因此减少了离子对萃取分光光度法中提取的离子对的数量，并降低了变色移位因此，可以得出结论，就CTAB + AO52和CPC + AO52系统而言，离子对萃取分光光度法和直接UV-vis测量的结果相互对应。 PA的过量不会引起任何光谱偏移。因此，这与离子对萃取分光光度法的结果一致，因为PA的过量不会影响所萃取离子对的吸光度。

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