Proton-sensitive fluorescent organogels
摘要：
A 1,10-phenanthroline-appended cholesterol-based gelator1and its nongelling reference compound2were synthesized. Among 19 solvents tested herein, gelator1could gelate 11 solvents including alcohols, dipolar aprotic solvents, organic acids and a base triethylamine, indicating that1acts as a versatile gelator. The TEM observation gave a visual image showing that fibrillar aggregates are entangled in the three-dimensional network structure. In the fluorescence measurements, most gels afforded an emission maximum at 394 nm purple emission, whereas only the acetic acid gel afforded an emission maximum at 522 nm yellow emission. Thus, the influence of protonation of the 1,10-phenanthroline nitrogens by trifluoroacetic acid on the fluorescence properties in the gel phase was investigated in detail. The results have established that the fluorescence intensity of1·Hbecomes particularly strong in the gel phase, presumably because of the energy transfer from neutral1to protonated1·Hand the restriction of the1·Hmolecular motion. The finding suggests the possibility that the gel system would be useful not only as a new proton-sensitive fluorescence system but also as a new medium for designing efficient energy transfer systems.
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DOI：
10.1039/b210968a
被引量：
年份：
2003
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