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arXiv 1706.03565physics.chem-ph
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非芳香族氨基酸和聚氨基酸的普遍固有发射

Prevalent Intrinsic Emission from Nonaromatic Amino Acids and Poly(Amino Acids)

Xiaohong Chen, Weijian Luo, Huili Ma, Qian Peng, Wang Zhang Yuan, Yongming Zhang

摘要:

非芳香族氨基酸通常被认为是非发射性的,因为它们在单个分子内缺乏明显的共轭作用。在这里,我们报告的内在可见光发射的非芳香族氨基酸和聚(氨基酸)的浓缩溶液和固体粉末。这种独特的和广泛的发光特性可以很好地合理化的成簇触发发射(CTE)机制,即非传统的发色团(即氨基,羰基,和羟基)和随后的电子云的聚类重叠,同时构象硬化。单晶结构分析进一步支持了这种CTE机制。除了即时荧光,室温磷光(RTP)也从固体检测。此外,在停止UV照射后,在示例性的ε-聚-L-赖氨酸的聚(氨基酸)(ε-PLL)的粉末中观察到持续的RTP。这些结果不仅说明了在探索新的发光生物分子中采用非芳香族氨基酸的构建块的可行性,而且还提供了显着的影响,在聚集态或结晶态的肽和蛋白质的RTP。

英文摘要:

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 simultaneously conformation rigidification. Such CTE mechanism is further supported by the single crystal structure analysis. Besides prompt fluorescence, room temperature phosphorescence (RTP) are also detected from the solids. Moreover, persistent RTP is observed in the powders of exampled poly(amino acid) of ε-poly-L-lysine (ε-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 RTP of peptides and proteins at aggregated or crystalline states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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