A study of anionic motion in sodium thiocyanate by 14N nuclear quadrupole resonance
| Autor: | Takehiko Chiba, Tetsuo Asaji, Kazunari Takagi |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Coupling constant
Arrhenius equation Chemistry Organic Chemistry Activation energy Analytical Chemistry Ion Inorganic Chemistry Crystal chemistry.chemical_compound symbols.namesake Computational chemistry Quadrupole Physics::Atomic and Molecular Clusters symbols Physical chemistry Sodium thiocyanate Physics::Chemical Physics Nuclear quadrupole resonance Spectroscopy |
| Zdroj: | Journal of Molecular Structure. 345:59-64 |
| ISSN: | 0022-2860 |
| DOI: | 10.1016/0022-2860(94)08380-z |
| Popis: | An anionic motion in sodium thiocyanate was studied by the spin-lattice relaxation time measurements of 14 N nuclear quadrupole resonance. The relaxation time decreased rapidly obeying an Arrhenius equation above T = 375 K. This result suggests the onset of a head-tail reorientational motion of thiocyanate ion with an activation energy of ≈ 95 kJ mol −1 . The origin of an anomalous temperature dependence of the quadrupole coupling constant is reinvestigated in relation to the anionic motion. It is concluded that a gradual change in electronic state of the anions, not the anionic motion, in the crystal with varying temperature is responsible for the anomaly claimed previously. Intermolecular interaction between N and Na atoms is suggested to be the most important factor in the origin of the change in the electronic state of the anion. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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