Molecular recognition of carbonyl compounds by uranyl-salophen based neutral receptors driven by Van der Waals forces
| Autor: | van Axel castelli, V., van Axel Castelli, Valeria, Dalla Cort, Antonella, Mandolini, Luigi, Pinto, Valentina, Reinhoudt, David, Ribaudo, Fabrizio, Sanna, Cecilia, Schiaffino, Luca, Ruel, Bianca H.M. |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
chemistry.chemical_classification
Chloroform Stereochemistry Chemistry IR-37947 Van der Waals strain Neutral molecule recognition General Chemistry enone guests ketone guests neutral molecule recognition uranyl-salophen van der waals forces symbols.namesake chemistry.chemical_compound Crystallography Molecular recognition symbols Non-covalent interactions Phenyl group van der Waals forces Titration van der Waals force Ketone guests METIS-206206 Molecular tweezers Enone guests Uranyl-salophen |
| Zdroj: | Supramolecular chemistry, 14(2-3), 211-219. Taylor & Francis |
| ISSN: | 1061-0278 |
| Popis: | The complexation of the salophen-uranyl metallocleft 2 and of its half-cleft analogue 3 with enones and other carbonyl compounds was assessed in chloroform by UV-Vis titration and, occasionally, by FT-IR measurements. Complexes with receptors 2 and 3 are in all cases more stable than those with the control unsubstituted uranyl-salophen 1 , showing that in addition to the primary binding force provided by coordination of the carbonyl oxygen to the uranium, a significant driving force for complexation, typically in the range of 2-3 kcal/mol, results from van der Waals interactions of the guest with the aromatic walls. Replacement of the phenyl group in 3 with larger aromatic residues to give 4 and 5 , led to enhanced complex stabilities, due to more extended contact surfaces between host and guest. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|