Host-guest assembly of pyridinium-conjugated calix[4]arene via cation-π interaction

TETRAHEDRON LETTERS

卷:47

Article

Ishihara, S ; Takeoka, S

关键词: calixarene;    cation-pi interaction;    molecular recognition;    host-guest chemistry;    supramolecular chemistry;   

DOI  :  10.1016/j.tetlet.2005.10.152

来源: Elsevier

【 摘 要 】

25-(4-Pyridiniumbutoxy)-26,27,28-trihydroxycalix[4]arene bromide I was designed to have both host and guest units in one molecule, and was assembled to become an oligomer via a cation-pi interaction. X-ray diffraction (XRD) crystallographic study of I revealed that it oriented in a one-dimensional structure. Titrimetric H-1 NMR analysis and electrospray ionization mass spectrometry (ESI-MS) analysis indicated that I formed an oligomer in solution, and the restraint of the segmental motion would lead to the stabilization of the cation-pi interaction compared with a bi-molecular complex composed of 25,26,27,28-tetrahydroxycalix[4]arene and N-butylpyridinium bromide. (c) 2005 Elsevier Ltd. All rights reserved.

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