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Prevalent intrinsic emission from nonaromatic amino acids and poly(amino acids)

Science China Chemistry 2018年第3期61卷 351-359页

作者： Xiaohong Chen Weijian Luo Huili Ma Qian Peng Wang Zhang Yuan Yongming Zhang School of Chemistry and Chemical Engineering Shanghai Key Laboratory of Electrical Insulation and Thermal AgingShanghai Electrochemical Energy Devices Research Center Shanghai Jiao Tong University Department of Chemistry Tsinghua University Institute of Chemistry Chinese Academy of Sciences

nonaromatic amino acids are generally believed to be nonemissive, owing to their lack of apparently remarkable conjugation within individual molecules. Here we report the intrinsic visible emission of nonaromatic amino acids and poly(amino acids) in concentrated solutions and solid powders. This unique and widespread luminescent characteristic can be well rationalized by the clustering-triggered emission(CTE) mechanism, namely the clustering of nonconventional chromophores(i.e. amino, carbonyl,and hydroxyl) and subsequent electron cloud overlap with simultaneous conformation rigidification. Such CTE mechanism is further supported by the single crystal structure analysis, from which 3 D through space electronic communications are *** prompt fluorescence, room temperature phosphorescence(RTP) is also detected from the solids. Moreover, persistent RTP is observed in the powders of exampled poly(amino acids) of ε-poly-L-lysine(.-PLL) after ceasing UV irradiation. These results not only illustrate the feasibility of employing the building blocks of nonaromatic amino acids in the exploration of new luminescent biomolecules, but also provide significant implications for the emissions of peptides and proteins at aggregated or crystalline states. Meanwhile, they may also shed lights on further understanding of autofluorescence from biological systems.

关键词： nonaromatic amino acids aggregation-induced emission clustering-triggered emission through space electronic communications room temperature phosphorescence

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