11B NMR study on the interaction of boric acid with Azomethine H

被引：17

作者：

Matsuo, H

Miyazaki, Y

Takemura, H

Matsuoka, S

Sakashita, H

Yoshimura, K ^{[1
]}

机构：

[1] Kyushu Univ, Fac Sci, Dept Chem, Chuo Ku, Fukuoka 8108560, Japan

[2] Fukuoka Univ Educ, Dept Chem, Fukuoka 8114192, Japan

[3] Kyushu Univ, Ctr Adv Instrumental Anal, Kasuga, Fukuoka 8168580, Japan

来源：

POLYHEDRON | 2004年 / 23卷 / 06期

关键词：

berate complex; azomethine H; boric acid; complexation; B-11; NMR;

D O I：

10.1016/j.poly.2003.12.016

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

B-11 NMR spectroscopy provided direct evidence that boric acid reacts with Azomethine H to form a 1: 1 bischelate complex. A new peak with a -17.9 ppm chemical shift is due to the chelate complex containing tetrahedral boron. It has been quantitatively confirmed that the reaction includes two chemical equilibria;, one is related to the ligand formation and the other to the complex formation. The formation constant for the ligand is small, less than 10, whereas that for the complex is relatively large, greater than 10(5). Azomethine H is hydrolyzed in aqueous solution because of its low stability, and the ligand formation is responsible for the nature of its complexation with boric acid. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：955 / 961

页数：7

共 25 条

[1] AUTOMATED IN-SITU PREPARATION OF AZOMETHINE-H AND SUBSEQUENT DETERMINATION OF BORON IN AQUEOUS-SOLUTION [J].