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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Exciplex Emission of Carbazole-Terephthalate Cyclophane and Its Application as a Fluorescent Probe for Local Polarity of Solvents
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Exciplex Emission of Carbazole-Terephthalate Cyclophane and Its Application as a Fluorescent Probe for Local Polarity of Solvents

机译：咔唑-对苯二甲酸对苯二甲酸环酯的络合物发射及其在溶剂局部极性的荧光探针中的应用

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摘要

Photophysical properties of carbazole-terephthalate cyclophane (Cz-TP) were studied.The absorption spectra of Cz-TP in various solvents were slightly broadened due to the distortion of the carbazole (Cz) moiety and became similar to that of a reference compound of carbazole-benzene cyclophane (Cz-Bz).The absorption spectrum and the peak wavelengths of Cz-TP were insensitive to the solvent polarity.These findings show that there is transannular pi-pi electronic interaction between the Cz and TP moieties but that the charge transfer interaction from the Cz to TP moieties is small in the ground state.On the other hand,the emission spectrum was broad,structureless,and red-shifted compared with that of the reference compound.The peak wavelength of the emission was shifted to a longer wavelength with increases in the dielectric constant of solvents.The peak shift was quantitatively explained by the Lippert-Mataga formula.Therefore,we conclude that the broad emission is due to the intramolecular exciplex in Cz-TP.The dielectric constant of 2-methyl tet-rahydrofuran was evaluated from the exciplex emission of Cz-TP ranging from 77 to 292 K,indicating that the Cz-TP molecule is an excellent polarity probe not only in a liquid phase but also in a solid phase over a wide temperature range.
机译：研究了咔唑-对苯二甲酸酯对苯二酚（Cz-TP）的光物理性质。由于咔唑（Cz）部分的变形，Cz-TP在各种溶剂中的吸收光谱略有加宽，变得类似于咔唑的参考化合物-苯环烷（Cz-Bz）.Cz-TP的吸收光谱和峰波长对溶剂极性不敏感，这些发现表明Cz和TP部分之间存在环环状pi-pi电子相互作用，但电荷转移在基态下，从Cz到TP部分的相互作用很小。另一方面，与参考化合物相比，发射光谱宽泛，无结构且发生红移。发射的峰值波长移至更长Lippert-Mataga公式定量解释了峰位移。因此，我们得出结论，宽发射是由于分子内从Cz-TP的激基复合物发射范围为77到292 K评估了2-甲基四氢呋喃的介电常数，这表明Cz-TP分子不仅是在Cz-TP中的极佳极性探针。液相，也可以在宽温度范围内以固相存在。

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