| Autor: |
Willans CE; School of Chemistry, University of Leeds, Leeds, UK LS2 9JT., Anderson KM, Potts LC, Steed JW |
| Jazyk: |
angličtina |
| Zdroj: |
Organic & biomolecular chemistry [Org Biomol Chem] 2009 Jul 07; Vol. 7 (13), pp. 2756-60. Date of Electronic Publication: 2009 May 26. |
| DOI: |
10.1039/b904148f |
| Abstrakt: |
A ditopic tetrapodal imidazolium-based 1,3-alternate calix[4]arene host binds anions as 1 : 2 complexes via a range of CH...anion hydrogen bonds. Allosteric enhancement of the affinity for the second chloride anion is observed. X-Ray crystal structures of the chloride, bromide and nitrate complexes suggest that this behaviour is linked to inter-binding site communication mediated by the calixarene framework. The imidazolium groups exist as either in-out or out-out conformers with respect to the calixarene, with the chloride complex exhibiting conformational isomorphism such that both forms are present in the same crystal structure. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
|
