1H NMR relaxometry and quadrupole relaxation enhancement as a sensitive probe of dynamical properties of solids—[C(NH2)3]3Bi2I9 as an example.
PBN-AR
Instytucja
Wydział Chemii (Uniwersytet Wrocławski)
Źródłowe zdarzenia ewaluacyjne
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Journal of Chemical Physics
ISSN
0021-9606
EISSN
1089-7690
Wydawca
Amer Inst Physics, Melville
DOI
Rok publikacji
2016
Numer zeszytu
Strony od-do
054501/1-054501/8
Numer tomu
144
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Streszczenia
Język
en
Treść
1H nuclear magnetic resonance relaxometry has been applied to reveal information on dynamics and structure of Gu3Bi2I9 ([Gu = C(NH2)3] denotes guanidinium cation). The data have been analyzed in terms of a theory of quadrupole relaxation enhancement, which has been extended here by including effects associated with quadrupole (14N) spin relaxation caused by a fast fluctuating component of the electric field gradient tensor. Two motional processes have been identified: a slow one occurring on a timescale of about 8 × 10−6 s which has turned out to be (almost) temperature independent, and a fast process in the range of 10−9 s. From the 1H-14N relaxation contribution (that shows “quadrupole peaks”) the quadrupole parameters, which are a fingerprint of the arrangement of the anionic network, have been determined. It has been demonstrated that the magnitude of the quadrupole coupling considerably changes with temperature and the changes are not caused by phase transitions. At the same time, it has been shown that there is no evidence of abrupt changes in the cationic dynamics and the anionic substructure upon the phase transitions.  
Cechy publikacji
original-article
Inne
System-identifier
2016CH8034
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