Ionic liquid-induced aggregation behavior of kryptocyanine dye

IF 2.7 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

New Journal of Chemistry Pub Date : 2024-09-13 DOI:10.1039/D4NJ03627A

Preeti Kasana, Saloni, Jahangeer Ahmed and Vinod Kumar

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Abstract

In this paper, we report the unusual aggregation behavior of an important cyanine dye 1,1′-diethyl-4,4′-carbocynine iodide (DECI), also known as kryptocyanine, which interestingly depends on the type of the ionic liquid (IL) present in the aqueous solutions of the dye. Notably, the presence of a small amount of ILs containing [BF₄]⁻, [PF₆]⁻ and [OTf]⁻ anions induced the process of J-aggregation instantly, and the added ILs acted as promoters for J-aggregation, followed by time-dependent precipitation. In contrast to the above-mentioned ILs, the presence of a small amount of ILs containing Tf₂N⁻ anions induced the process of J- and H-aggregation simultaneously, followed by time-dependent conversion of H-aggregates to J-aggregates. Furthermore, the aggregation behavior of the dye was also found to be dependent on the concentration of the dye, temperature conditions, and nature of solubilizing media (polarity of the solvent and pH).

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离子液体诱导的氪青染料聚合行为

本文报告了一种重要的氰基染料 1,1'-二乙基-4,4'-碘化羰基炔（DECI）（又称 "氪氰"）的异常聚集行为，有趣的是，这种行为取决于染料水溶液中离子液体（IL）的特性。有趣的是，含有少量[BF4]-、[PF6]-和[OTf]-阴离子的离子液体会立即诱导 J-聚集过程，而添加的离子液体则作为 J-聚集的促进剂，随时间沉淀。与含有 ILs 的 [BF4]-、[PF6]- 和 [OTf]- 阴离子相反，含有 ILs 的少量 Tf2N- 阴离子可同时诱导 J- 和 H- 聚集过程，然后 H- 聚集体随时间变化转变为 J- 聚集体。此外，还发现染料的聚集行为取决于染料的浓度、温度条件和增溶介质的性质（溶剂的极性和 pH 值）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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