Hydrogen-Bonding Clusters Leading to Formation of Supramolecular Dimers of Metalloporphyrin Receptors: Modulation of Lewis Acidity by π-π Interactions
Two remarkable crystal structures are reported of a cyclic receptor 1, containing two metalloporphyrin units. The overall crystal structure of 1 provides the first direct evidence that π‐stacking between two metalloporphyrins reduces the Lewis acidity of the metal ion and thereby dramatically reduce...
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Veröffentlicht in: | Chemistry : a European journal 2000-06, Vol.6 (12), p.2112-2119 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Two remarkable crystal structures are reported of a cyclic receptor 1, containing two metalloporphyrin units. The overall crystal structure of 1 provides the first direct evidence that π‐stacking between two metalloporphyrins reduces the Lewis acidity of the metal ion and thereby dramatically reduces the affinity of zinc for external ligands; this effect was previously suggested indirectly by solution state binding studies. In addition, crystallising 1 from a different combination of solvents and the ability of 1 to distort its structure leads to the remarkable observation of a supramolecular dimer of inter‐penetrating macrocycles, 4, held together by clusters of hydrogen‐bonded methanol molecules. |
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ISSN: | 0947-6539 1521-3765 |
DOI: | 10.1002/1521-3765(20000616)6:12<2112::AID-CHEM2112>3.0.CO;2-W |