Liquid-Crystalline Ordering of Davydov-Split Aggregates of Cyanine Dyes
Liquid-Crystalline Ordering of Davydov-Split Aggregates of Cyanine Dyes
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DOI：
10.1016/j.colsurfa.2022.128713
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发表时间：
2022-03
期刊：
影响因子：
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通讯作者：
Yiping Ma;Arianna Dicce;N. Reddy;Jiyu Fang
中科院分区：
文献类型：
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作者：
Yiping Ma;Arianna Dicce;N. Reddy;Jiyu Fang
3，3 ′-双十四烷基氧碳菁（DiOC 14（3））和3，3 ′-双十八烷基氧碳菁（DiOC 18（3））是具有共轭多甲川主链和两个长烃尾的亲脂性碳菁染料。本文报道了DiOC_（14）（3）和DiOC_（18）（3）在甲醇/水混合溶剂中形成Davydov分裂聚集体的研究结果。DiOC 14（3）的Davydov分裂聚集体在不存在氨的情况下显示纤维状形态，在存在氨的情况下显示囊泡状形态。而DiOC 18（3）的Davydov分裂聚集体显示出具有不同层状结构的囊泡状形态，这取决于甲醇/水混合物中氨的存在。这些Davydov分裂聚集体具有不同的形态是双折射时，被视为通过交叉偏振器，这表明它们具有液晶相。Davydov分裂聚集体纤维和囊泡具有液晶相和独特的激发态，因为液晶有序和分子激子协同作用，在光子应用方面具有巨大的潜力。
3,3′-ditetradecyloxacarbocyanine (DiOC14(3)) and 3,3′-Dioctadecyloxacarbocyanine (DiOC18(3)) are lipophilic carbocyanine dyes with a conjugated polymethine backbone and two long hydrocarbon tails. In this paper, we report the formation of Davydov-split aggregates of DiOC14(3) and DiOC18(3) in methanol/water mixtures with and without ammonia, which show a blue-shifted H-band and a red-shifted J-band with respect to the monomer band in their UV–vis absorption spectra. The Davydov-split aggregates of DiOC14(3) show a fiber-like morphology in the absence of ammonia and a vesicle-like morphology in the presence of ammonia. While the Davydov-split aggregates of DiOC18(3) show a vesicle-like morphology with the different lamellarities, depending on the presence of ammonia in the methanol/water mixtures. These Davydov-split aggregates with different morphologies are birefringence when being viewed through crossed polarizers, suggesting that they have liquid-crystalline phases. The Davydov-split aggregate fibers and vesicles with liquid-crystalline phases and unique excitations are great potential for photonic applications because the liquid-crystalline order and molecular exciton are synergized.