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Characterization of host–guest complexes of cucurbit[n]uril (n = 6, 7) by electrospray ionization mass spectrometry

✍ Scribed by Issey Osaka; Masanobu Kondou; Narayanan Selvapalam; Shashadhar Samal; Kimoon Kim; Mikhail V. Rekharsky; Yoshihisa Inoue; Ryuichi Arakawa

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
233 KB
Volume
41
Category
Article
ISSN
1076-5174

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✦ Synopsis

Abstract

When an intramolecular cavity exists in a molecule, it can trap another chemical species to form a host–guest complex. We examine the formation of such an inclusion complex with cucurbit[n]uril (CBn, n = 6, 7) as the host to trap alkali metal or ammonium ions as the guest, by electrospray ionization mass spectrometry (ESI‐MS). The results show that the inclusion complexes are formed between the three‐dimensional cylinder of CBn hosts and the guest cations. Selectivity of the complex formation is dependent both on (1) ion–dipole interactions between the cylindrical portal of the CBn hosts and the guest cations and (2) the hydrophobic interactions at the inner cavity of CBn. Copyright © 2006 John Wiley & Sons, Ltd.

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