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- Publisher Website: 10.1021/jo0110799
- Scopus: eid_2-s2.0-0037111599
- PMID: 12423124
- WOS: WOS:000179110400006
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Article: Probing polyvalency in artificial systems exhibiting molecular recognition
Title | Probing polyvalency in artificial systems exhibiting molecular recognition |
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Authors | |
Issue Date | 2002 |
Citation | Journal of Organic Chemistry, 2002, v. 67, n. 23, p. 7968-7981 How to Cite? |
Abstract | An approach to the study of polyvalency - the interaction of polyvalent receptors with polyvalent ligands - in unnatural systems is outlined. In this study, the complexation of dibenzylammonium cations by dibenzo [24] crown-8 or benzometaphenylene[25]crown-8 is utilized as the component receptor-ligand interaction. Two analogous multivalent receptors - each containing either seven dibenzo[24]crown-8 (DB24C8 CLUSTER) or seven benzometaphenylene[25] crown-8 (BMP25C8 CLUSTER) moieties appended to a modified β-cyclodextrin core - were prepared in moderate yields. For each of these multivalent receptors, complementary mono- and divalent ligands containing one or two dialkylammonium centers, respectively, were prepared in good yields. These ligands contained fluorine atom substituents to allow their interactions with crown ether compounds to be probed by 19F NMR spectroscopy. The complexation of these monovalent ligands with the DB24C8 CLUSTER and the BMP25C8 CLUSTER was studied by determining the average binding constant (KAVE) between the receptors and ligands. The abilities of the crown ether clusters to complex with these monovalent ligands was compared with those of the monovalent crown ethers dibenzo[24]crown-8 and benzometaphenylene[25]crown-8. In both instances, it was found that clustering seven crown ethers together into one molecule is detrimental to the abilities of the crown ether moieties to complex with monovalent dialkylammonium ligands. The complexation of the divalent ligands by the DB24C8 CLUSTER and the BMP25C8 CLUSTER was then studied - again by determining KAVE - and their abilities to complex with these ligands was compared with those of their respective component interactions. By determining KAVE for the polyvalent interaction, it was possible to calculate an association constant, KPOLY, for the binding of the divalent ligands by the DB24C8 CLUSTER and the BMP25C8 CLUSTER compounds. In both instances KPOLY for the polyvalent interaction was found to be approximately 2 orders of magnitude higher than the association constants, KA, for the component interaction. |
Persistent Identifier | http://hdl.handle.net/10722/333591 |
ISSN | 2021 Impact Factor: 4.198 2020 SCImago Journal Rankings: 1.200 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Fulton, David A. | - |
dc.contributor.author | Cantrill, Stuart J. | - |
dc.contributor.author | Stoddart, J. Fraser | - |
dc.date.accessioned | 2023-10-06T05:20:51Z | - |
dc.date.available | 2023-10-06T05:20:51Z | - |
dc.date.issued | 2002 | - |
dc.identifier.citation | Journal of Organic Chemistry, 2002, v. 67, n. 23, p. 7968-7981 | - |
dc.identifier.issn | 0022-3263 | - |
dc.identifier.uri | http://hdl.handle.net/10722/333591 | - |
dc.description.abstract | An approach to the study of polyvalency - the interaction of polyvalent receptors with polyvalent ligands - in unnatural systems is outlined. In this study, the complexation of dibenzylammonium cations by dibenzo [24] crown-8 or benzometaphenylene[25]crown-8 is utilized as the component receptor-ligand interaction. Two analogous multivalent receptors - each containing either seven dibenzo[24]crown-8 (DB24C8 CLUSTER) or seven benzometaphenylene[25] crown-8 (BMP25C8 CLUSTER) moieties appended to a modified β-cyclodextrin core - were prepared in moderate yields. For each of these multivalent receptors, complementary mono- and divalent ligands containing one or two dialkylammonium centers, respectively, were prepared in good yields. These ligands contained fluorine atom substituents to allow their interactions with crown ether compounds to be probed by 19F NMR spectroscopy. The complexation of these monovalent ligands with the DB24C8 CLUSTER and the BMP25C8 CLUSTER was studied by determining the average binding constant (KAVE) between the receptors and ligands. The abilities of the crown ether clusters to complex with these monovalent ligands was compared with those of the monovalent crown ethers dibenzo[24]crown-8 and benzometaphenylene[25]crown-8. In both instances, it was found that clustering seven crown ethers together into one molecule is detrimental to the abilities of the crown ether moieties to complex with monovalent dialkylammonium ligands. The complexation of the divalent ligands by the DB24C8 CLUSTER and the BMP25C8 CLUSTER was then studied - again by determining KAVE - and their abilities to complex with these ligands was compared with those of their respective component interactions. By determining KAVE for the polyvalent interaction, it was possible to calculate an association constant, KPOLY, for the binding of the divalent ligands by the DB24C8 CLUSTER and the BMP25C8 CLUSTER compounds. In both instances KPOLY for the polyvalent interaction was found to be approximately 2 orders of magnitude higher than the association constants, KA, for the component interaction. | - |
dc.language | eng | - |
dc.relation.ispartof | Journal of Organic Chemistry | - |
dc.title | Probing polyvalency in artificial systems exhibiting molecular recognition | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1021/jo0110799 | - |
dc.identifier.pmid | 12423124 | - |
dc.identifier.scopus | eid_2-s2.0-0037111599 | - |
dc.identifier.volume | 67 | - |
dc.identifier.issue | 23 | - |
dc.identifier.spage | 7968 | - |
dc.identifier.epage | 7981 | - |
dc.identifier.isi | WOS:000179110400006 | - |