Akbaş Halide, Kartal Ciğdem
Department of Chemistry, Faculty of Sciences and Letters, Fen-Edebiyat Faculty, Aysekadin, Trakya University, 22030 Edirne, Turkey.
Spectrochim Acta A Mol Biomol Spectrosc. 2006 Sep;65(1):95-9. doi: 10.1016/j.saa.2005.09.033. Epub 2006 Feb 7.
The effect of electrolytes on the interaction between an anionic dye and a cationic surfactant was investigated spectrophotometrically in submicellar concentration range at certain temperature. The spectral change of the azo dye C.I. Reactive Orange 16 (RO16) exhibits a high sensitivity to the polarity of dye's environment. Dodecylpyridinium chloride (DPC) affects the electronic absorption spectra of dye solution that is dye-surfactant interaction results formation of complex and therefore a decrease in maximum absorption spectra (1.577 at 494 nm). The electrolyte cations cause an increase of the absorbance of DPC-RO16 ion-pair complex in the following order: Ca(2+)>Na(+)>NH(4)(+)>K(+)>Mg(2+), also for electrolyte anions Br(-)>Cl(-)>SO(4)(2-). Furthermore, this order can be changeable with increasing electrolyte concentration. The increase on absorbance value with increasing electrolyte concentration is explained as charge screening. The increase or decrease on absorption spectra of RO16-DPC solution depends on concentration range of the electrolyte added. As an increase on absorbance value with increasing electrolyte concentration is explained as charge screening, a decrease in this value for higher concentration of electrolyte is attributed as the charge of micelle shape.
在特定温度下，采用分光光度法研究了亚胶束浓度范围内电解质对阴离子染料与阳离子表面活性剂之间相互作用的影响。偶氮染料C.I.活性橙16（RO16）的光谱变化对染料环境的极性表现出高灵敏度。十二烷基吡啶氯化物（DPC）影响染料溶液的电子吸收光谱，即染料 - 表面活性剂相互作用导致复合物形成，因此最大吸收光谱降低（494 nm处为1.577）。电解质阳离子使DPC - RO16离子对复合物的吸光度按以下顺序增加：Ca(2+)>Na(+)>NH(4)(+)>K(+)>Mg(2+)，对于电解质阴离子，顺序为Br(-)>Cl(-)>SO(4)(2-)。此外，随着电解质浓度增加，该顺序可能会改变。随着电解质浓度增加吸光度值的增加被解释为电荷屏蔽。RO16 - DPC溶液吸收光谱的增加或减少取决于所添加电解质的浓度范围。由于随着电解质浓度增加吸光度值的增加被解释为电荷屏蔽，对于较高浓度的电解质，该值的降低归因于胶束形状的电荷。
