EVIDENCE FOR TRIMERIZATION IN AQUEOUS SOLUTIONS OF METHYLENE BLUE
EVIDENCE FOR TRIMERIZATION IN AQUEOUS SOLUTIONS OF METHYLENE BLUE
复制标题
DOI：
10.1021/j100853a035
复制
发表时间：
1968-01-01
影响因子：
--
通讯作者：
BRASWELL, E
中科院分区：
文献类型：
--
作者：
BRASWELL, E
亚甲基蓝水溶液在6 × 10~（-7）~ 6 × 10 ~（-2）M范围内的吸收光谱可以用一个简单的反应来描述，即3D+ D ~（22+）+ D ~（+7）= iD ~（33+），其平衡常数大致相同。蒸气压渗透法测定证实，聚集度随染料浓度的增加而渐近地接近3.某些碱性染料的吸收光谱随染料水溶液浓度增加的行为是众所周知的，通常表现为主吸收带的蓝移.这些偏离Beer-Bourget吸收定律的现象被归因于染料分子的聚集（见参考文献1-8），这可能是由离域电子产生的色散力引起的。1-3水在这些聚集体形成中的作用，无论是作为染料分子之间的介电介电层5· 6还是
The absorption spectra of aqueous solutions of methylene blue over the concentration range from 6 X 10~ 7, Kt to 6 X 10-2 M can be described by assuming a simple reaction, ie, 3D+ D22++ D+ 7= i D33+, where the equilibrium constants are approximately the same. Vapor pressure osmometry measurements have con-firmed that the degree ofaggregation asymptotically approaches 3 as the dye concentration increases.The behavior of the absorption spectra of certain basic dyes upon increasingthe concentration of an aqueous solution of the dye is well known and usually evinces itself as a blue shift of the major absorption band. These deviationsfrom the Beer-Bourget ab-sorption law havebeen ascribed to the aggregation of the dye molecule (see, for example, ref 1-8), which presumably is brought about by dispersionforces arising from the delocalized electrons. 1-3 The role of water in the formation of these aggregates, either as a dielectric sandwiching between the dye molecules5· 6 or