Lower rim alkylammonium-substituted calix[4[arenes as 'proton-switchable' extractants for chromate and dichromate anions
| Autor: | Emil M. Georgiev, Nicholas J. Wolf, D. Max Roundhill |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution Chloroform Chromate conversion coating Extraction (chemistry) Protonation Borane Medicinal chemistry Chromate and dichromate Inorganic Chemistry chemistry.chemical_compound chemistry Calixarene Materials Chemistry Organic chemistry Physical and Theoretical Chemistry |
| Zdroj: | Polyhedron. 16:1581-1584 |
| ISSN: | 0277-5387 |
| Popis: | The compound 5,11,17,23-tetra-tert-butyl-25,27-bis(2-aminoethoxy)-26,28-dihydroxycalix[4]arene ( 2 ) has been synthesized by the borane reduction of 5,11,17,23-tetra-tert-butyl-25,27-bis(2-dicyanomethoxy)-26,28-dihydroxycalix[4]arene ( 1 ). The protonated alkylammonium form of 2 is an effective extractant for transferring the anions CrO 4 2− and Cr 2 O 7 2− from an aqueous into a chloroform layer. The monoanions Cl − , CH 3 CO 2 − and NO 3 − , and dianions SO 4 2− MoO 4 2− and WO 4 2− have little effect on the extraction of CrO 4 2− and CrO 7 2− . Deportonation of the dialkylammonium cation results in reversal with CrO 4 2− and Cr 2 O 7 2− migrating back into the aqueous layer. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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