摘要
研究了室温下外加盐反离子对一种阴离子菁染料在稀水溶液的J-聚集体形成的效应。吸收光谱表明反离子未并入平面菁离子自身的堆叠体内,而应是以电性关系“束缚”于其外。电化学法测定染料溶液中反离子活度的结果表明,菁离子堆叠体与“束缚”于其外的简单金属反离子之间接近于以电价关系相维系。吸收光谱还表明,分别加入所选用的几种简单盐反离子时,它们引起在同浓度染料Ⅰ稀溶液中产生J-聚集体的最低浓度主要受反离子电荷的,控制,反离子本性的影响不明显;高价反离子对于引发生J-聚集体特别有效。
The effect of counterions on the J-aggregai ion of an anionic cyanine dye, 4, 5, 4', 5'-dibenzo-9-ethyl-3, 3'-bis-(3-sulfopropyl)-thiacarbocyanine (1), in dilute aqueous solutions at room temperature was studied. Absorption spectra indicated that the counterions were not incorporated in the planar dye-ion stacks. Counterion activity measurements for dye I in solutions on adding simple metal ion salts resulted in that the dye-ion stacks with the surrounding counterions bound nearby behaved nearly as a salt-like 'totality'. The spectra also showed that, for the-added metal ion salts, the minimum Counterion concentrations necessary for initiating J-ag-gregation of dye I in dilute solutions of constant dye concentration depends mainly on the charge of the counterions, being much more efficient for the high velent ones. The effect of the nature-of the counterions was not significant.
出处
《感光科学与光化学》
CSCD
1989年第1期37-41,共5页
Photographic Science and Photochemistry
关键词
菁染料
聚集态
反离子
cyanine dye, aggregation, counterion
