| 有机试剂的结构与性质研究(Ⅴ)——5-Br-PADAP的酸碱平衡及其在溶液中存在形式的研究 |
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| 引用本文： | 李克安,童沈阳,刘锋,李娜.有机试剂的结构与性质研究(Ⅴ)——5-Br-PADAP的酸碱平衡及其在溶液中存在形式的研究[J].高等学校化学学报,1991,12(1):26. |
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| 作者姓名： | 李克安 童沈阳 刘锋 李娜 |
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| 作者单位： | 北京大学化学系, 100871 |
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| 摘 要： | 本文用分光光度法研究了2-2-(5-溴-吡啶)偶氮]-5-二乙胺基酚(5-Br-PADAP)的酸碱平衡,实验测得的pH和A的数据,用最小二乘法处理得到了5-Br-PADAP在30％乙醇溶液中的离解常数:pKa1=-0.12,PKa2=1.66,pKa3=12.30;并用HMO量子化学计算法确定了5-Br-PADAP在溶液中可能存在的各种形式.
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| 关 键 词： | 5-Br-PADAP 离解常数 最小二乘法 HMO法 |
| 收稿时间： | 1989-08-14 |
Studies on the Structure and Property of Organic Reagent (V)--Acid-Base Equilibrium of 5-Br-PADAP and Its Existence Form in Aqueous Solution |
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| Li Ke-an,Tong Shen-yang,Liu Feng,Li Na.Studies on the Structure and Property of Organic Reagent (V)--Acid-Base Equilibrium of 5-Br-PADAP and Its Existence Form in Aqueous Solution[J].Chemical Research In Chinese Universities,1991,12(1):26. |
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| Authors: | Li Ke-an Tong Shen-yang Liu Feng Li Na |
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| Institution: | Department of Chemistry, Peking University, Beijing, 100871 |
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| Abstract: | Acid-base equilibrium of 2-2-(5-bromo-pyridyl) azo]-5- (diethylamino) phenol (5-Br-PADAP) was studied by spectrophotometry and the dissociation constants of 5-Br-PADAP in 30% (v/ v) ethanol solution were obtained by using least IsSquare method according to the datas of A and pH. pKa1= - 0. 12, pKa2= 1. 66, pKa3= 12. 36. The isomers of 5-Br-PADAP which exists in aqueous solution were determined by quantum chemistry method. |
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| Keywords: | 5-Br-PADAP Dissociation constants Least square method HMO method |
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