A spectrophotometric investigation of the complex between titanyl oxalate and 3-hydroxyflavone in water ethanolic mixtures

被引：5
|
作者：
Aleksic, M [1 ]
Blagojevic, S [1 ]
Malesev, D [1 ]
Radovic, Z [1 ]
机构：
[1] Univ Belgrade, Fac Pharm, YU-11000 Belgrade, Yugoslavia
来源：
JOURNAL OF THE SERBIAN CHEMICAL SOCIETY | 2000年 / 65卷 / 09期
关键词：
complex; 3-hydroxyflavone (3HF); titanyl oxalate; spectrophotometric methods;
D O I：
10.2298/JSC0009631A
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
It has been established, by the application or suitable spectrophotometric methods and pH-metric measurements, that titanyl oxalate anion and 3-hydroxyflavone (3HF) form a [TiO(C2O4)(2)(C15H9O3)(2)](4-) complex. The investigation of the composition and thr concentration stability constant of the complex were carried out in a 50% aqueous ethanol solution at room temperature (20 degrees C), in the pH range from 1.9 to 9.0, The concentration stability constant of the complex, log beta(2) ranged from 16.65 at pH 5.0 to 13.96 at pH 7.0. The conditions for the spectrophotometric determination of 3HF by means of the complex formation were investigated in the concnetration range From 2.5 x 10(-5) to 3.0 x 10(-4) mol dm(-3) 3HF.
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页码：631 / 638
页数：8
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