Effect of alkylpyrazinium counterions on the host-guest recognition based on dimethoxypillar[5]arenes
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- 作者：Lijing Liu ; Lei Guo ; Qiuhua Zhao ; Yongkui Shan…
- 刊名：Chemical Research in Chinese Universities
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：32
- 期：2
- 页码：202-206
- 全文大小：409 KB
- 刊物主题：Chemistry/Food Science, general; Analytical Chemistry; Inorganic Chemistry; Organic Chemistry; Physical Chemistry;
- 出版者：Springer Berlin Heidelberg
- ISSN：2210-3171
- 卷排序：32
文摘
In this work, we synthesized n-octylpyrazinium bromide(G-Br) and n-octylpyrazinium hexafluorophosphate(G-PF6) as model guests and studied their host-guest complexation with 1,4-dimethoxypillar[5]arene(DMP5A). Effect of alkylpyrazinium counterions on the host-guest recognition was investigated. Based on the 1H NOESY spectra, the binding site of DMP5A with G-PF6 is the same as that of DMP5A with G-Br. However, G-PF6 forms a stronger complex with DMP5A than G-Br, owing to that hexafluorophosphate forms weaker doubly inonic H-bonds with ammonium cation than bromide ion in chloroform, which leads to some aggregates that could be dissociated with the addition of DMP5A.KeywordsPillarareneCounterionHost-guest recognitionSupramolecular chemistry