Photophysical behaviour of 2,6-diaminoanthraquinone in different solvents and at various pH

被引：5
|
作者：
Kumar, P. Siva [1 ]
Nayaki, S. Kothai [1 ]
Swaminathan, M. [1 ]
机构：
[1] Annamalai Univ, Fac Engn & Technol, Dept Chem, Annamalainagar, Tamil Nadu, India
来源：
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2007年 / 68卷 / 03期
关键词：
2,6-Diaminoanthraquinone; Hydrogen bonding interactions; Solvent relaxation;
D O I：
10.1016/j.saa.2006.12.042
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
The absorption and fluorescence spectral properties of 2,6-diaminoanthraquinone (DAAQ) have been investigated in a series of organic solvents of different polarity and in aqueous solutions with H-o/pH/H- in the range - 10 to 17. The Stokes shift of DAAQ is correlated with various polarity scales. The study reveals the fluorescence of DAAQ dication is red shifted on protonation. The abnonnal fluorescence of DAAQ dication is found to be due to large solvent relaxation in polar medium. The acidity constants for various prototropic reactions in S-o and S-1 states are determined and discussed. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：651 / 655
页数：5
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