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NMR study of guanidinium cation dynamics in C(NH2)3SbCl6.
Autorzy
Rok wydania
2002
Czasopismo
Numer woluminu
100
Strony
1969-1973
DOI
10.1080/00268970210127951
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Proton NMR second moment and spin—lattice relaxation times T 1 and T 1p have been studied for polycrystalline guanidinium hexachloroantimonate C(NH2)3SbCl6 in a wide temperature range. A dynamic inequivalence of two cations has been detected in spite of their crystal-lographical equivalence. Activation parameters for C3 reorientation and self-diffusion of the more mobile cation have been determined. It was shown that the para–ferroelastic phase transition at 351 K is connected with abrupt changes in the dynamics of the two cations. The weaker, second-order transition at 265 K is thought to be related to a change in the dynamics of one of the cations.
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