Exploration of the two-step crystallization of organic micro/nano crystalline materials by fluorescence spectroscopy†,Materials Chemistry Frontiers

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Exploration of the two-step crystallization of organic micro/nano crystalline materials by fluorescence spectroscopy†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-04-11 00:00:00 , DOI: 10.1039/c8qm00118a
Peng-Zhong Chen _{1,

2,

3,

4,

5} , Li-Ya Niu _{1,

2,

3,

4,

5} , Han Zhang _{1,

2,

3,

4,

5} , Yu-Zhe Chen _{6,

7,

8,

9,

10} , Qing-Zheng Yang _{1,

2,

3,

4,

5}

Affiliation

Clearly understanding the crystallization process of organic micro/nano crystalline (OMC) materials in solution is a long-standing challenge because of the difficulty in the separation of intermediates and monitoring the process in situ and in real-time. Herein, we report the exploration of the crystallization process of OMC materials from the amorphous intermediates by taking advantage of the spectral change of an environment-sensitive emission dye BF₂bcz. The intermediate for the formation of the OMC materials by the solvent-exchange method was separated as amorphous nanospheres which were transformed into crystalline nanorods by adding the surfactant to their aqueous dispersion. The distinct emission properties of the amorphous molecular aggregates and nanorods, used as a fingerprint for each species, allow for in situ and real-time monitoring of the crystallization process by using fluorescence spectroscopy. Such a facile method readily identified that increasing the concentration of surfactant and temperature both accelerated the crystallization process of BF₂bcz in aqueous solution, while the size of the nanorods increased with a decrease in the concentration of surfactant. Our work provided direct experimental evidence to support the two-step nucleation mechanism in the preparation of OMC by the solvent-exchange method.

中文翻译：

通过荧光光谱探索有机微/纳米晶体材料的两步结晶†

清楚地了解溶液中有机微/纳米晶体（OMC）材料的结晶过程是一项长期的挑战，因为很难分离中间体并就地和实时监控该过程。本文中，我们报告了利用环境敏感型发射染料BF ₂的光谱变化来探索OMC材料从无定形中间体结晶的过程。bcz。通过溶剂交换法形成OMC材料的中间体被分离为无定形纳米球，通过将表面活性剂加入其水分散体中，该无定形纳米球被转化为结晶纳米棒。用作每种物种的指纹的无定形分子聚集体和纳米棒的独特发射特性，允许使用荧光光谱技术对结晶过程进行原位和实时监控。这种简便的方法很容易确定，增加表面活性剂的浓度和温度都可以促进BF ₂的结晶过程。水溶液中，纳米棒的大小随表面活性剂浓度的降低而增加。我们的工作提供了直接的实验证据，以支持通过溶剂交换法制备OMC的两步成核机理。

更新日期：2018-04-11

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