Bhogala, Balakrishna R. ; Nangia, Ashwini (2006) Influence of the ammonium cation and 18-crown-6 guest on the supramolecular networks of 1,3,5-cyclohexanetricarboxylic acid Crystal Growth & Design, 6 (1). pp. 32-35. ISSN 1528-7483
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Official URL: http://pubs.acs.org/doi/abs/10.1021/cg050396w
Related URL: http://dx.doi.org/10.1021/cg050396w
Abstract
The title acid 1,3-cis,5-cis-cyclohexanetricarboxylic acid (H3CTA) forms a three-dimensional anionic host framework via O-H···O- hydrogen bonds with 11.2 × 12.7 Å square channels for the inclusion of 18-crown-6 (18-C-6) and NH4+ cation in a Russian doll assembled guest ncavit and clathrand crystal structure, H2CTA-·H2O·NH4+·18-C-6 (1). Differences in the binding of the ammonium cation to the crown ether and OHNH3+ cation result in a two-dimensional network of H2CTA- anions in H2CTA-·OHNH3+·18-C-6 (2) that resemble the black phosphorus topology. In contrast to ionic structures 1 and 2, crystal structure of the neutral complex H3CTA·(18-C-6)0.5 (3) is sustained by a size/shape fit of the crown macrocycle in the 14.5 × 14.5 Å hexagonal cavity of the triacid host and 12 C-H···O interactions.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Chemical Society. |
| ID Code: | 24562 |
| Deposited On: | 29 Nov 2010 08:31 |
| Last Modified: | 04 Mar 2011 05:30 |
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