NMR-STUDY OF CROWN-ETHER MOTION IN 2 ALKALIDES
Nuclear spin-lattice relaxation times (T1) of both 133Cs and 23Na were measured as a function of temperature for two cesium sodides, Cs+( 18-crown-6)2Na- and Cs+( 15-crown-5)2Na-. A logarithmic dependence of the T1, values of these two compounds on the inverse temperature is interpreted as the resul...
| Hlavní autoři: | , , , , , , |
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| Médium: | Journal article |
| Jazyk: | English |
| Vydáno: |
1992
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| _version_ | 1826262625913143296 |
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| author | Wagner, M Mcmills, L Ellaboudy, A Eglin, J Dye, J Edwards, P Pyper, N |
| author_facet | Wagner, M Mcmills, L Ellaboudy, A Eglin, J Dye, J Edwards, P Pyper, N |
| author_sort | Wagner, M |
| collection | OXFORD |
| description | Nuclear spin-lattice relaxation times (T1) of both 133Cs and 23Na were measured as a function of temperature for two cesium sodides, Cs+( 18-crown-6)2Na- and Cs+( 15-crown-5)2Na-. A logarithmic dependence of the T1, values of these two compounds on the inverse temperature is interpreted as the result of crown ether rotational/conformational reorientation with average activation barriers of 31.2 and 35.4 kJ mol-1, respectively. This interpretation is supported by the line-width reduction of the 23Na resonances, reduction of the observed 23Na quadrupole coupling constants, and the disappearance of peaks in the powder X-ray diffraction patterns. The line-width data are used with the approximate formula of Waugh (Waugh, J. S.; Fedin, E. I. Sov. Phys. Solid State 1963, 4, 1633) to yield activation barriers in good agreement with the nuclear spin-lattice relaxation analysis. © 1992 American Chemical Society. |
| first_indexed | 2024-03-06T19:39:11Z |
| format | Journal article |
| id | oxford-uuid:2011ff62-1047-4dd0-9df6-bf7045da4ee0 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:39:11Z |
| publishDate | 1992 |
| record_format | dspace |
| spelling | oxford-uuid:2011ff62-1047-4dd0-9df6-bf7045da4ee02022-03-26T11:25:29ZNMR-STUDY OF CROWN-ETHER MOTION IN 2 ALKALIDESJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:2011ff62-1047-4dd0-9df6-bf7045da4ee0EnglishSymplectic Elements at Oxford1992Wagner, MMcmills, LEllaboudy, AEglin, JDye, JEdwards, PPyper, NNuclear spin-lattice relaxation times (T1) of both 133Cs and 23Na were measured as a function of temperature for two cesium sodides, Cs+( 18-crown-6)2Na- and Cs+( 15-crown-5)2Na-. A logarithmic dependence of the T1, values of these two compounds on the inverse temperature is interpreted as the result of crown ether rotational/conformational reorientation with average activation barriers of 31.2 and 35.4 kJ mol-1, respectively. This interpretation is supported by the line-width reduction of the 23Na resonances, reduction of the observed 23Na quadrupole coupling constants, and the disappearance of peaks in the powder X-ray diffraction patterns. The line-width data are used with the approximate formula of Waugh (Waugh, J. S.; Fedin, E. I. Sov. Phys. Solid State 1963, 4, 1633) to yield activation barriers in good agreement with the nuclear spin-lattice relaxation analysis. © 1992 American Chemical Society. |
| spellingShingle | Wagner, M Mcmills, L Ellaboudy, A Eglin, J Dye, J Edwards, P Pyper, N NMR-STUDY OF CROWN-ETHER MOTION IN 2 ALKALIDES |
| title | NMR-STUDY OF CROWN-ETHER MOTION IN 2 ALKALIDES |
| title_full | NMR-STUDY OF CROWN-ETHER MOTION IN 2 ALKALIDES |
| title_fullStr | NMR-STUDY OF CROWN-ETHER MOTION IN 2 ALKALIDES |
| title_full_unstemmed | NMR-STUDY OF CROWN-ETHER MOTION IN 2 ALKALIDES |
| title_short | NMR-STUDY OF CROWN-ETHER MOTION IN 2 ALKALIDES |
| title_sort | nmr study of crown ether motion in 2 alkalides |
| work_keys_str_mv | AT wagnerm nmrstudyofcrownethermotionin2alkalides AT mcmillsl nmrstudyofcrownethermotionin2alkalides AT ellaboudya nmrstudyofcrownethermotionin2alkalides AT eglinj nmrstudyofcrownethermotionin2alkalides AT dyej nmrstudyofcrownethermotionin2alkalides AT edwardsp nmrstudyofcrownethermotionin2alkalides AT pypern nmrstudyofcrownethermotionin2alkalides |