Journal
LANGMUIR
Volume 30, Issue 39, Pages 11753-11760Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la503299j
Keywords
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Funding
- National Basic Research Program of China [2013CB733700]
- China National Funds for Distinguished Young Scientists [21125104]
- National Natural Science Foundation of China [21002082, 51373039]
- Program for Innovative Research Team in University [IRT1117]
- Program of Shanghai Subject Chief Scientist [12XD1405900]
- Science and Technology Key Project of Henan Education Department [13A150760]
- Development Projects of Henan Province Science and Technology [132300410090]
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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 solgel 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 pi pi stacking between naphthalimide is suggested to be the main driving force for the gel formation and fluorescent variation by means of temperature-dependent H-1 NMR study and theoretical calculation.
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