作者:Khoroshutin, Andrey、Martynov, Leonid、Yaltseva, Polina、Kostenko, Evita、Cheshkov, Dmitry、Botezatu, Anatoliy、Moiseeva, Anna、Fedorov, Yuri、Fedorova, Olga
DOI:10.1039/d4nj02414a
日期:——
annulated to a tetracyclic thiophene-containing aromatic fragment were synthesized by the Mallory–Katz photocyclization reaction from a single stilbene precursor. These compounds were produced by cyclization of its two conformers and differed in the degree of steric hindrance exerted by the tetracyclic fragment on the crown ether. Their complexation with ammonium and barium perchlorates was studied both
通过 Mallory-Katz 光环化反应,从单一二苯乙烯前体合成了两种新型大环化合物,其冠醚部分与含四环噻吩的芳香片段成环。这些化合物是通过其两个构象异构体环化产生的,并且四环片段对冠醚施加的空间位阻程度不同。在溶液中通过核磁共振、紫外-可见光和荧光光谱研究了它们与高氯酸铵和高氯酸钡的络合,并在PVC膜中通过冠醚促进水相和膜相之间的离子转移研究了它们与高氯酸铵和高氯酸钡的络合。在溶液中,冠醚的拥塞表现为两种异构体的光谱对盐的添加的不同响应。此外,空间位阻异构体与所研究离子的结合力比无位阻异构体弱。此外,拥挤的异构体在络合时表现出更大的扩散系数下降。在 PVC 膜中,观察到的结合常数较高,尽管拥塞异构体和非拥塞异构体之间的差异不太明显。通过 MMFF94 力场和 DFT 计算对可能的构象进行分析,以解释络合时 NMR 光谱变化的特征。