分子内二聚体的形成揭示了性溶剂 perfluorodecalin 内的异常溶解
1Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India. sipandey@chemistry.iitd.ac.in.
Physical chemistry chemical physics : PCCP
|August 23, 2023
概括
由于溶解不良,像 perfluorodecalin (PFD) 这样的溶剂会在二烯烯 (BPP) 探头中引起异常的基态聚合. 添加n-hexane破坏了这种聚合,突出了独特的化溶剂特性.
科学领域:
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
- 超分子化学 超分子化学
背景情况:
- 溶剂由于的高电子负性而表现出独特的特性.
- 溶液溶解和聚合行为可以在化与碳化合物溶剂之间显著不同.
- 1,3-bis(1-pyrenyl) (BPP) 是一种光探针,已知可以在碳化合物溶剂中形成分子内聚物.
研究的目的:
- 为了研究BPP在溶剂 perfluorodecalin (PFD) 中的分子内聚合.
- 探索温度和辅溶剂 (n-hexane) 对 PFD 中 BPP 聚合的影响.
- 与碳化合物溶剂相比,了解化介质中溶解的作用.
主要方法:
- 稳态光发射和激发光谱学.
- 时间分辨率光谱 (激发状态的发射强度衰变).
- 在PFD和PFD/n-hexane混合物中进行变量温度研究 (293.15333.15K).
主要成果:
- 在PFD中,BPP形成了分子内部的分泌物,但也表现出基态聚合,与碳化合物溶剂不同.
- 随着温度的增加,PFD中的地面状态聚合会减少.
- 添加一小分子分数的n-hexane (0.1) 消除了基态聚合,恢复了激发状态的 Excimer 形成.
- 在PFD/n-hexane混合物中首选用n-hexane溶解的pyrene探针,支持PFD中的BPP溶解差.
结论:
- 在PFD中BPP的解决不良是观察到的基态聚合的原因.
- 与传统的碳化合物溶剂相比,溶剂会诱导不同的溶液聚合行为.
- 这些发现表明化介质中独特的溶解和聚合现象.
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