期刊
ASIAN JOURNAL OF ORGANIC CHEMISTRY
卷 1, 期 4, 页码 352-358出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ajoc.201200086
关键词
chromophores; fluorescence; green fluorescent protein; photophysics; solid-state emission
资金
- NSFC
- CAS
- State Key Basic Research Program
Green fluorescent protein (GFP)-like chromophores 1-5, in which the p-hydroxylphenyl group is substituted with large aromatic moieties, were synthesized and their crystal structures were determined. Compared with that of p-hydroxybenzylideneimidazolinone (GFP chromophore), the fluorescence spectra of 15 are red-shifted because of elongated of p-conjugation. However, the incorporation of large aromatic moieties cannot inhibit the intramolecular torsional motions and, thus, 1-5 are generally weakly fluorescent in solution. The results manifest that the solid-state emission of these GFP-like chromophores is significantly influenced by the intermolecular packing. The emission spectra of 1-5 are further red-shifted in the solid-state, and 5 in the crystalline state emits in at red wavelengths with an emission maximum at 624 nm. 1, 3, and 4 are weakly emissive in both crystalline and powder forms. Interestingly, one crystalline state of 2 (2B) emits relatively strongly, whereas another crystalline state 2A emits rather weakly.
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