Fluorescence behavior of isoflavones: pH-dependent effects

被引：0
|
作者：
Luouska, M. I. [1 ]
Roshal, A. D. [1 ]
Doroshenko, A. O. [1 ]
Kyrychenko, A. V. [1 ]
Khilya, V. P. [2 ]
机构：
[1] V Karazin Kharkiv Natl Univ, Res Inst Chem, 4 Svobody Sq, UA-61077 Kharkov, Ukraine
[2] T Shevchenko Kyiv Natl Univ, Chem Dept, UA-01003 Kiev, Ukraine
来源：
FUNCTIONAL MATERIALS | 2005年 / 12卷 / 03期
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中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Fluorescence spectra of isoflavones are studied in the pH/H-0 range 12 to -10. The assignment of the observed emission bands to acid-base forms of isoflavones is done, the pH/H-0 ranges of the existence of each of forms are determined. In 7-methoxyisoflavone solutions, only fluorescence of the cationic form is detected. In the case of 7-hydroxy-isoflavones, the fluorescence of the cationic, anionic and phototautomeric forms are found. The emission band in the range 400-420 nm characteristic for all isoflavones is assigned to their photodestruction products. The dissociation and protonation constants of isoflavones in the ground and excited states are evaluated.
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页码：563 / 568
页数：6
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