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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Spectroscopic characterization of phenazinium dye aggregates in water and acetonitrile media: Effect of methyl substitution on the aggregation phenomenon
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Spectroscopic characterization of phenazinium dye aggregates in water and acetonitrile media: Effect of methyl substitution on the aggregation phenomenon

机译：水和乙腈介质中非那嗪染料聚集体的光谱表征：甲基取代对聚集现象的影响

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摘要

Absorption, fluorescence, and fluorescence excitation spectral studies of two planar, cationic phenazinium dyes, namely, phenosafranin (PSF) and safranin-T (ST), have been performed in protic and aprotic polar solvents. The studies reveal the formation of both J- and H-aggregates in concentrated solutions. The planarity of the phenazinium skeleton and the presence of a positive charge are attributed to be the driving force for this aggregation behavior. The aggregates are established to be dimers only. The positive inductive effect of the methyl substituents in safranin-T augments the aggregation process. The experiments reveal that for both dyes, the polar protic solvent favors the aggregation process more than the aprotic solvent.
机译：已在质子和非质子极性溶剂中进行了两种平面型阳离子苯并nium氮染料苯酚弗拉宁（PSF）和番红素T（ST）的吸收，荧光和荧光激发光谱研究。研究揭示了浓缩溶液中J和H聚集体的形成。苯并菲骨架的平面性和正电荷的存在被归因于这种聚集行为的驱动力。将聚集体确定为仅二聚体。藏红素-T中甲基取代基的正诱导作用增强了聚集过程。实验表明，对于两种染料，极性质子溶剂比非质子溶剂更有利于聚集过程。

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