Characterization by epr spectroscopy of the chiral catalysts bis(oxazoline)-Cu supported in laponites
An Electron Paramagnetic Resonance study of a chiral Bis(oxazoline)-Cu(II) supported in laponite (synthetic hectorite) is presented. It is concluded that the complex is incorporated into the interllamellar space of the clay giving out isolated Cu(II) entities in which the metal is co-ordinated to ox...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2000-08-01
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| Series: | Boletín de la Sociedad Española de Cerámica y Vidrio |
| Subjects: | |
| Online Access: | http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/817/845 |
| _version_ | 1811323593284386816 |
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| author | Alonso, P. J. Martínez, J. I. García, J. I. Fraile, J. M. Mayoral, J. A. Sánchez, M. C. García, J. |
| author_facet | Alonso, P. J. Martínez, J. I. García, J. I. Fraile, J. M. Mayoral, J. A. Sánchez, M. C. García, J. |
| author_sort | Alonso, P. J. |
| collection | DOAJ |
| description | An Electron Paramagnetic Resonance study of a chiral Bis(oxazoline)-Cu(II) supported in laponite (synthetic hectorite) is presented. It is concluded that the complex is incorporated into the interllamellar space of the clay giving out isolated Cu(II) entities in which the metal is co-ordinated to oxygen or nitrogen atoms with a symmetry practically planar-square, regardless the solvent used. That point out that the chlorine ligands in the complex are exchanged in the incorporation process in agreement with the previous X-ray absorption spectroscopy data, so that the oxygen atoms of the interlayers and clay surface act as counterions.<br><br>Se presenta un estudio mediante Resonancia Paramagnética Electrónica del complejo quiral Bis(oxazolina)-Cu(II) soportado en laponita (hectorita sintética) (libre de hierro. Del mismo se concluye que el complejo se incorpora en el espacio interlamelar de la arcilla dando lugar a entidades de Cu(II) aisladas en las cuales el metal se coordina a átomos de oxígenos y nitrógenos con una simetría prácticamente planocuadrada, independientemente del disolvente empleado. Ello indica, de acuerdo con los datos previos de espectroscopia de absorción de rayos-X, que los ligandos cloruro del complejo son intercambiados en el proceso de incorporación de forma que los oxígenos de la superficie interlaminar y externa de la arcilla actúan como contraiones. |
| first_indexed | 2024-04-13T13:57:56Z |
| format | Article |
| id | doaj.art-adc2ec29d5144728b8f75e92d359b2fb |
| institution | Directory Open Access Journal |
| issn | 0366-3175 |
| language | English |
| last_indexed | 2024-04-13T13:57:56Z |
| publishDate | 2000-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Boletín de la Sociedad Española de Cerámica y Vidrio |
| spelling | doaj.art-adc2ec29d5144728b8f75e92d359b2fb2022-12-22T02:44:09ZengElsevierBoletín de la Sociedad Española de Cerámica y Vidrio0366-31752000-08-01394552555Characterization by epr spectroscopy of the chiral catalysts bis(oxazoline)-Cu supported in laponitesAlonso, P. J.Martínez, J. I.García, J. I.Fraile, J. M.Mayoral, J. A.Sánchez, M. C.García, J.An Electron Paramagnetic Resonance study of a chiral Bis(oxazoline)-Cu(II) supported in laponite (synthetic hectorite) is presented. It is concluded that the complex is incorporated into the interllamellar space of the clay giving out isolated Cu(II) entities in which the metal is co-ordinated to oxygen or nitrogen atoms with a symmetry practically planar-square, regardless the solvent used. That point out that the chlorine ligands in the complex are exchanged in the incorporation process in agreement with the previous X-ray absorption spectroscopy data, so that the oxygen atoms of the interlayers and clay surface act as counterions.<br><br>Se presenta un estudio mediante Resonancia Paramagnética Electrónica del complejo quiral Bis(oxazolina)-Cu(II) soportado en laponita (hectorita sintética) (libre de hierro. Del mismo se concluye que el complejo se incorpora en el espacio interlamelar de la arcilla dando lugar a entidades de Cu(II) aisladas en las cuales el metal se coordina a átomos de oxígenos y nitrógenos con una simetría prácticamente planocuadrada, independientemente del disolvente empleado. Ello indica, de acuerdo con los datos previos de espectroscopia de absorción de rayos-X, que los ligandos cloruro del complejo son intercambiados en el proceso de incorporación de forma que los oxígenos de la superficie interlaminar y externa de la arcilla actúan como contraiones.http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/817/845EPRCu(II)chiral catalystsEPRCu(II)catalizadores quirales |
| spellingShingle | Alonso, P. J. Martínez, J. I. García, J. I. Fraile, J. M. Mayoral, J. A. Sánchez, M. C. García, J. Characterization by epr spectroscopy of the chiral catalysts bis(oxazoline)-Cu supported in laponites Boletín de la Sociedad Española de Cerámica y Vidrio EPR Cu(II) chiral catalysts EPR Cu(II) catalizadores quirales |
| title | Characterization by epr spectroscopy of the chiral catalysts bis(oxazoline)-Cu supported in laponites |
| title_full | Characterization by epr spectroscopy of the chiral catalysts bis(oxazoline)-Cu supported in laponites |
| title_fullStr | Characterization by epr spectroscopy of the chiral catalysts bis(oxazoline)-Cu supported in laponites |
| title_full_unstemmed | Characterization by epr spectroscopy of the chiral catalysts bis(oxazoline)-Cu supported in laponites |
| title_short | Characterization by epr spectroscopy of the chiral catalysts bis(oxazoline)-Cu supported in laponites |
| title_sort | characterization by epr spectroscopy of the chiral catalysts bis oxazoline cu supported in laponites |
| topic | EPR Cu(II) chiral catalysts EPR Cu(II) catalizadores quirales |
| url | http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/817/845 |
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