Large Red-Shifted Fluorescent Emission via Intermolecular 蟺鈥撓€ Stacking in 4-Ethynyl-1,8-naphthalimide-Based Supramolecular Assemblies

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• 作者：Xinhua Cao ; Luyan Meng ; Zhenhua Li ; Yueyuan Mao ; Haichuang Lan ; Liming Chen ; Yang Fan ; Tao Yi
• 刊名：Langmuir
• 出版年：2014
• 出版时间：October 7, 2014
• 年：2014
• 卷：30
• 期：39
• 页码：11753-11760
• 全文大小：608K
• ISSN：1520-5827

文摘

Two low molecular weight gelators containing 4-ethynyl-1,8-naphthalimide groups with large conjugated structure via different length of alkyl chains were synthesized and fully characterized. The gelation properties, structural character, and fluorescence of the gels were investigated via methods of scanning electron microscopy, X-ray diffraction, and spectral studies. The gelators have high fluorescence quantum yields in both solution and solid state. Interestingly, the wavelength of the fluorescent emission in the reversible sol鈥揼el transition process of the gels has a large red-shift of 80 nm in DMF, which is extremely sparse for 1,8-naphthalimide derivatives in the literature. The intermolecular 蟺鈥撓€ stacking between naphthalimide is suggested to be the main driving force for the gel formation and fluorescent variation by means of temperature-dependent ¹H NMR study and theoretical calculation.