Etude par R.M.N. des mouvements et de la geometrie de l'ion oxonium dans des sels cristallises |
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| Affiliation: | 1. Institute for Positive Psychology and Education, Australian Catholic University, North Sydney, NSW, Australia;2. University of Toronto Scarborough, Toronto, ON, Canada;3. Drexel University, Philadelphia, PA, United States;4. University of Rochester;5. University of Pennsylvania, Philadelphia, PA, United States;6. Children''s Hospital of Philadelphia, Philadelphia, PA, United States |
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| Abstract: | ![]()
Wide line P.M.R. spectra have been recorded from 90°K to room temperature for three oxonium compounds : H3O+NO3− ; H 3O+ClO4− ;(H3O+)2PtCl62− and two nitrile oxonium compounds : (H3O+)2 (NO2+)9 (ClO4−)11 and (H3O+) (NO2+) (ClO4−)2.By a second moment analysis in the rigid lattice, the d(OH) of H3O+ ions are shown to decrease in the order :NO3− ⪢ ClO4− ⋍ PtCl62− ⋍ 1.1.2. ⋍ 2.9.11.If the oxonium ion is rigid at all temperature in the nitrate,it undertakes complex motions in all the other cases.Reduction factors as well as activation energy laws at temperature under the phase transition can be interpreted as consequences of at least two uncorrelated reorientations. The order of Ea :ClO4− ⪢ PtCl62− ⪢ 2.9.11. is characteristic of an increasing freedom of the oxonium ion.Above the phase transition, the motion is classified as endospheric and goes to an isotropic one at increasing temperatures. |
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