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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 9, Number 1
JKCSEZ 9(1)
February 20, 1965 

 
Title
Study of 8-Hydroxyquinoline Derivatives. The Acid Dissociation Constants of 5-Acetyl-8-Hydroxyquinoline

8-Hydroxyquinoline 유도체에 관한 연구 5-Acetyl-8-Hydroxyquinoline의 산해리정수
Author
Dong Hyung Lee

이동형
Keywords
Abstract
5-Acetyl-8-hydroxyquinoline 의 산해리정수를 25℃(μ=0.1)에서 분광광도법과 pH적정법에 의하여 측정하였다. 두 방법에 의하여 얻은 pK1은 근사하게 일치하였으며 pK값은 8-hydroxyquinoline의 해당 pK값보다 작다. 그것은 acetyl group의 방향족환에 대한 전자흡인성에 기인한 결과라고 생각한다.

Acid dissociation constants of 5-acetyl-8-hydroxyquinoline have been determined by spectrophotometric and potentiometric methods at 25℃. pK1, pK2 values obtained by potentiometric method were 4.56, 8.20 respectively and pK1obtained by spectrophotometric method was 4.21. pK values were lower than those of 8-hydroxyquinoline. The lower basicity of 5-acetyl-8-hydroxyquinoline compared with 8-hydroxyquinoline was considered as the result of the electronic attraction of the acetyl group with aromatic ring.

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33 - 36
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