| Autor: |
Bradley D. Smith, Martin Patrick Hughes |
| Rok vydání: |
1998 |
| Předmět: |
|
| Zdroj: |
Molecular Recognition and Inclusion ISBN: 9789401062268 |
| DOI: |
10.1007/978-94-011-5288-4_97 |
| Popis: |
Neutral receptors for anions have been recently reported by several research groups.1 The primary inspiration for our acetate receptor came from a study by Etter and coworkers, who discovered that diarylurea derivatives with electron withdrawing groups in the meta positions were exceptionally good at forming 1:1 crystalline complexes with hydrogen bond acceptors.2 Isomeric derivatives with ortho or para substituents did not form such co-crystals. This “meta effect” was attributed to a substituent induced intramolecular C-HiO hydrogen bonding interaction between the carbonyl oxygen and the acidified ortho hydrogens. Such an intramolecular interaction was postulated to weaken the hydrogen bond accepting ability of the urea carbonyl. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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