期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2011, 期 10, 页码 1968-1971出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201001460
关键词
Calixarenes; Inclusion compounds; Pi interactions; Cyclophanes
资金
- Grants-in-Aid for Scientific Research [21106015] Funding Source: KAKEN
Azacalixarene 1, with a relatively long chain substituent, can exhibit both inter-and intramolecular CH center dot center dot center dot pi interactions. In the crystalline state, the 4-phenybutyl group is included in the molecular cavity, allowing interactions between the methylene H atoms and the aromatic rings of the azacalix skeleton. In addition, similar edge-to-face interactions occur between the terminal phenyl ring and that of an adjacent molecule, thus forming a polymeric, supramolecular array of azacalixarene molecules. In solution, the 4-phenylbutyl arm adopts two orientations, one included in the calix cavity, one not, giving rise to isomers describable as exo and endo conformers. Characterization of the exo/endo equilibrium as a function of temperature by H-1 NMR spectroscopy enabled estimation of the enthalpy difference favoring inclusion attributed to the intracavity CH center dot center dot center dot pi interactions.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据