Spectroscopic studies of nile red in organic solvents and polymers
Spectroscopic studies of nile red in organic solvents and polymers
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DOI：
10.1016/1010-6030(95)04140-0
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发表时间：
1996-01-04
影响因子：
4.3
通讯作者：
Ohta, K
中科院分区：
文献类型：
--
作者：
Dutta, AK;Kamada, K;Ohta, K
我们研究了尼罗红 (NR)（一种高荧光激光染料）在有机溶剂、二元溶剂混合物和聚合物中的光谱特性。光谱研究揭示了吸收和发射带位置和强度随介质极性的变化而发生显着变化。如此大的变化归因于极性介质中分子的扭曲分子内电荷转移（TICT）状态。实验结果表明，该分子对其微环境的极性敏感，是呈现受限几何形状的系统的优秀探针。我们已将 NR 融入到聚甲基丙烯酸甲酯 (PMMA) 和聚乙烯醇 (PVA) 薄膜中；发现PVA的微极性大于PMMA；在PVA中，微极性对应于乙腈和水的二元混合物的微极性，而在PMMA中，微极性与纯乙腈的微极性非常接近。
We have studied the spectroscopic properties of nile red (NR), a highly fluorescent laser dye, in organic solvents, binary solvent mixtures and polymers. Spectroscopic studies reveal remarkable changes in the absorption and emission band positions and intensities as a function of the polarity of the medium. Such large changes have been attributed to the twisted intramolecular charge transfer (TICT) state of the molecule in polar medium. Experimental results show that the molecule is sensitive to the polarity of its microenvironment and is an excellent probe for systems presenting restricted geometries. We have incorporated NR into thin films of poly(methyl methacrylate) (PMMA) and poly(vinyl alcohol) (PVA); it is found that the micropolarity in PVA is greater than that in PMMA; in PVA, the micropolarity corresponds to that of a binary mixture of acetonitrile and water, whereas in PMMA, the micropolarity corresponds closely to that of pure acetonitrile.