| 新型吡啶偶氮试剂质子化行为的分光光度法研究 |
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| 引用本文： | 王勇,杨瑞丽,杨合情,王小玲,张光.新型吡啶偶氮试剂质子化行为的分光光度法研究[J].陕西师范大学学报,1996(1). |
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| 作者姓名： | 王勇 杨瑞丽 杨合情 王小玲 张光 |
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| 作者单位： | 陕西师范大学化学系，咸阳师范专科学校化学系 |
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| 摘 要： | 应用分光光度法研究了两种新型吡啶偶氮二甲氨基苯胺类化合物在溶液中的离解平衡，测定了各级离解常数．结果表明，这两种化合物在溶液中均存在着三级离值分别为：ＰＫα１＝－４．５６，ＰＫα２＝１．０７，ＰＫα３＝５．１０．２－（５－溴－２－吡啶偶氮）－５－二甲氨基苯胺（记作５－Ｂｒ－ＰＡＤ－ＭＡ）的ＰＫα值分别为ＰＫα１＝－４．２５，ＰＫα２＝１．７１；ＰＫα３＝５．８８．探计了它们与钯和钴反应的机理
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| 关 键 词： | 吡啶偶氮二甲氨基苯胺 分光光度法 离解常数 反应机理 |
Spectrophotometric study of protonation behaviour of new pyridylazo reagents |
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| Wang Yong ,Yang Ruili ,Yang Heqing ,Wang Xiaoling ,Zhang Guang.Spectrophotometric study of protonation behaviour of new pyridylazo reagents[J].Journal of Shaanxi Normal University: Nat Sci Ed,1996(1). |
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| Authors: | Wang Yong Yang Ruili Yang Heqing Wang Xiaoling Zhang Guang |
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| Institution: | Wang Yong 1,Yang Ruili 2,Yang Heqing 1,Wang Xiaoling 1,Zhang Guang 1 |
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| Abstract: | The acid dissociation equilibria of two kinds of pyridylazo 5 dimethylamino aminobenzene in solution are studied by spectrophotometric method, and the aciddissociation constants are determined. It is shown that there are three step dissociation equilibria of these two compounds in the solutions. The values of p K a are as following: 2 (3,5 dichloro 2 pyridylazo) 5 dimethylamino aminobenzene (3,5 diCl PADMA), p K a 1 =-4.56, p K a 2 =1.07, p K a 3 =5.10; 2 (5 Bromo 2 pyridylazo) 5 dimethylamino aminobenzene (5 Br PADMA), p K a 1 =-4.25, p K a 2 =1.71, p K a 3 =5.88. The probable mechanisms of their reaction with palladium and cobalt are discussed. |
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| Keywords: | pyridylazo 5 dimethylamino aminobenzene spectrophotometric method dissociation contants reaction mechanism |
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