Ni, XL; Zhang, YQ; Zhu, QJ; Xue, SF; Tao, Z
Abstract: Three host–guest complexes, {acetone@m-TriCyHQ[6]}19H2O (1), {acetone@m-TriCyHQ[6]}{app}+Cl−12H2O (2), and {55dmbpy@m-TriCyHQ[6]}+ Cl−17H2O (3) were prepared with meta-tricyclohexyl cucurbit[6]uril (m-TriCyHQ[6]) and acetone, 3-amino-5-phenylpyrazole(app), and 5,5′-dimethyl-2,2′dipyridyl(55dmbpy), respectively. Their crystal structures along with that of {m-TriCyHQ[6]}22H2O (4) were characterized by single-crystal X-ray diffractions. The crystal structures of these host–guest complexes revealed that the host m-TriCyHQ[6] had a strong selectivity for different guest molecules, which were readily included in the cavity of m-TriCyHQ[6]. Small organic compounds, such as acetone and dioxane, showed a relatively strong tendency to interact only with the cavity of m-TriCyHQ[6]. However, guest 3-amino-5-phenylpyrazole hydrochloride preferred to interact with the portals of m-TriCyHQ[6] and guest 5,5′-dimethyl-2,2′-dipyridyl showed strong interactions with both the cavity and portals of m-TriCyHQ[6]. Basically, these guests form inclusion host–guest complexes with m-TriCyHQ[6], which were stabilized by the hydrophobic interactions in the cavity and the hydrophilic interactions at the portals. [Copyright 2008 Elsevier] Copyright of Journal of Molecular Structure is the property of Elsevier Science Publishers B.V. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts)