Studies on the Structure and Property of Organic Reagent (V)--Acid-Base Equilibrium of 5-Br-PADAP and Its Existence Form in Aqueous Solution

Chem. J. Chinese Universities ›› 1991, Vol. 12 ›› Issue (1): 26.

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Studies on the Structure and Property of Organic Reagent (V)--Acid-Base Equilibrium of 5-Br-PADAP and Its Existence Form in Aqueous Solution

Li Ke-an, Tong Shen-yang, Liu Feng, Li Na

Department of Chemistry, Peking University, Beijing, 100871

Received:1989-08-14 Online:1991-01-24 Published:1991-01-24

Abstract

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 Is Square method according to the datas of Aand pH. pK_a₁=-0. 12, pK_a₂=1. 66, pK_a₃=12. 36. The isomers of 5-Br-PADAP which exists in aqueous solution were determined by quantum chemistry method.

Key words: 5-Br-PADAP, Dissociation constants, Least square method, HMO method

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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]. Chem. J. Chinese Universities, 1991, 12(1): 26.

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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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