Molecular Fluorophores Self-Organize into C-Dot Seeds and Incorporate into C-Dot Structures.,The Journal of Physical Chemistry Letters

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Molecular Fluorophores Self-Organize into C-Dot Seeds and Incorporate into C-Dot Structures.
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-08-17 , DOI: 10.1021/acs.jpclett.0c01873
Michal Langer ₁ , Markéta Paloncýová ₁ , Miroslav Medved' ₁ , Michal Otyepka ₁

Affiliation

Various molecular fluorophores have been identified to be present during carbon-dot (C-dot) syntheses. However, the organization of such fluorophores in C-dots is still unknown. We study the self-assembly of 5-oxo-1,2,3,5-tetrahydroimidazo-[1,2-α]-pyridine-7-carboxylic acid (IPCA), a molecular fluorophore present during the synthesis of C-dots from citric acid and ethylenediamine. Both forms of IPCA (neutral and anionic) show a tendency to self-assemble into stacked systems, forming seeds of C-dots during their synthesis. IPCA also interacts with graphitic C-dot building blocks, fragments easily, and incorporates into their structures via π–π stacking. Both IPCA forms are able to create adlayers internally stabilized by an extensive hydrogen bonding network, with an arrangement of layers similar to that in ordinary graphitic C-dots. The results show the tendency of molecular fluorophores to form organized stacked seeds of C-dots and incorporate into C-dot structures. Such noncovalent structures can be further covalently interlinked via the carbonization process during C-dot growth.

中文翻译：

分子荧光团可自组织成C点种子并结合到C点结构中。

已经鉴定出在碳点（C-dot）合成过程中存在各种分子荧光团。然而，这种荧光团在C点中的组织仍是未知的。我们研究了5-氧代-1,2,3,5-四氢咪唑基-[1,2-α]-吡啶-7-羧酸（IPCA）的自组装，这是一种在合成碳点的过程中存在的分子荧光团柠檬酸和乙二胺两种形式的IPCA（中性和阴离子）都表现出自组装成堆叠系统的趋势，在合成过程中形成C点的种子。IPCA还可以与石墨C点构建块进行交互，轻松破碎，并通过π–π堆叠合并到其结构中。两种IPCA形式均能够创建由广泛的氢键网络内部稳定的添加剂，其层排列与普通石墨C点类似。结果表明分子荧光团倾向于形成有组织的C点堆叠种子并结合到C点结构中。这种非共价结构可以在碳点生长期间通过碳化过程进一步共价交联。

更新日期：2020-10-02

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