Interaction of Calix[4]arene and Aliphatic Amines: A Combined NMR, Spectrophotometric and Conductimetric Investigation
The constants related to the equilibria between calix[4]arene and aliphatic amines in acetonitrile were measured by conductimetric and spectrophotometric methods, and the structures of the salts studied by NMR spectroscopy. In concentrations about 10-4 mol L-1, free ions are at higher proportion, wh...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Química
2002-01-01
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| Series: | Journal of the Brazilian Chemical Society |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532002000300002 |
| _version_ | 1819051203350233088 |
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| author | Nachtigall Francine F. Lazzarotto Márcio Nome Faruk |
| author_facet | Nachtigall Francine F. Lazzarotto Márcio Nome Faruk |
| author_sort | Nachtigall Francine F. |
| collection | DOAJ |
| description | The constants related to the equilibria between calix[4]arene and aliphatic amines in acetonitrile were measured by conductimetric and spectrophotometric methods, and the structures of the salts studied by NMR spectroscopy. In concentrations about 10-4 mol L-1, free ions are at higher proportion, whereas at 10-2 mol L-1 there is an increase of ion-pairs proportion. The values of the constants found for acid-base reactions allow an evaluation of the value of pKa for calix[4]arene in acetonitrile as 16.6 pKa units. The analysis of data agrees with a proposal of exo-calix ammonium ion. |
| first_indexed | 2024-12-21T12:00:12Z |
| format | Article |
| id | doaj.art-e773e6833b7b482cb7c70cd97d8181d5 |
| institution | Directory Open Access Journal |
| issn | 0103-5053 |
| language | English |
| last_indexed | 2024-12-21T12:00:12Z |
| publishDate | 2002-01-01 |
| publisher | Sociedade Brasileira de Química |
| record_format | Article |
| series | Journal of the Brazilian Chemical Society |
| spelling | doaj.art-e773e6833b7b482cb7c70cd97d8181d52022-12-21T19:04:51ZengSociedade Brasileira de QuímicaJournal of the Brazilian Chemical Society0103-50532002-01-01133295299Interaction of Calix[4]arene and Aliphatic Amines: A Combined NMR, Spectrophotometric and Conductimetric InvestigationNachtigall Francine F.Lazzarotto MárcioNome FarukThe constants related to the equilibria between calix[4]arene and aliphatic amines in acetonitrile were measured by conductimetric and spectrophotometric methods, and the structures of the salts studied by NMR spectroscopy. In concentrations about 10-4 mol L-1, free ions are at higher proportion, whereas at 10-2 mol L-1 there is an increase of ion-pairs proportion. The values of the constants found for acid-base reactions allow an evaluation of the value of pKa for calix[4]arene in acetonitrile as 16.6 pKa units. The analysis of data agrees with a proposal of exo-calix ammonium ion.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532002000300002calixarenessupramolecular chemistryinteractions of amines |
| spellingShingle | Nachtigall Francine F. Lazzarotto Márcio Nome Faruk Interaction of Calix[4]arene and Aliphatic Amines: A Combined NMR, Spectrophotometric and Conductimetric Investigation Journal of the Brazilian Chemical Society calixarenes supramolecular chemistry interactions of amines |
| title | Interaction of Calix[4]arene and Aliphatic Amines: A Combined NMR, Spectrophotometric and Conductimetric Investigation |
| title_full | Interaction of Calix[4]arene and Aliphatic Amines: A Combined NMR, Spectrophotometric and Conductimetric Investigation |
| title_fullStr | Interaction of Calix[4]arene and Aliphatic Amines: A Combined NMR, Spectrophotometric and Conductimetric Investigation |
| title_full_unstemmed | Interaction of Calix[4]arene and Aliphatic Amines: A Combined NMR, Spectrophotometric and Conductimetric Investigation |
| title_short | Interaction of Calix[4]arene and Aliphatic Amines: A Combined NMR, Spectrophotometric and Conductimetric Investigation |
| title_sort | interaction of calix 4 arene and aliphatic amines a combined nmr spectrophotometric and conductimetric investigation |
| topic | calixarenes supramolecular chemistry interactions of amines |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532002000300002 |
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