Concentration effect on the absorption spectra of oxazine1 and methylene blue in aqueous and alcoholic solutions

被引：68

作者：

Ghanadzadeh, A. ^{[1
]}

Zeini, A. ^{[2
]}

Kashef, A. ^{[2
]}

Moghadam, M. ^{[1
]}

机构：

[1] Guilan Univ, Fac Sci, Dept Chem, Rasht, Iran

[2] Isfahan Univ, Fac Sci, Dept Chem, Esfahan, Iran

来源：

JOURNAL OF MOLECULAR LIQUIDS | 2008年 / 138卷 / 1-3期

关键词：

oxazine dyes; methylene blue; ionic dyes; aggregation; dye dimerization; exciton theory;

D O I：

10.1016/j.molliq.2007.09.005

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The visible absorption spectra of oxazine-1 (OX) in aqueous and alcoholic solutions were studied as a function of the dye concentration. Due to the structural similarity of OX and MB, the optical characterization of methylene blue, MB, was also investigated for comparison. OX in aqueous solutions appears to exist almost in its monomeric form at concentrations below about 1 x 10(-4) M, while MB exhibit strong tendency to aggregate even at the low concentrations. The dimerization behavior of OX and MB in water was analyzed in terms of monomer-dimer equilibria. The nature of the interacting pairs in these dyes was discussed using the exciton theory. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：100 / 106

页数：7

共 37 条

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