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Inne
Molecular dynamics of the methylammonium cation in [CH3NH3]5Bi2Cl11.
Autorzy
Rok wydania
1993
Czasopismo
Solid State Nuclear Magnetic Resonance
Numer woluminu
2
Strony
197-200
DOI
10.1016/0926-2040(93)90025-i
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The 1H relaxation times T1 of methylammonium in chlorobismuthate(III) were measured in the temperature range from 50 to 270 K with a SXP 4/100 Bruker pulse spectrometer at 55.2 MHz. It was found that the T1 temperature dependence has three minima. The individual relaxation rates of the three-proton groups can be described by the O'Reilly and Tsang formula. The results obtained from the fitting procedure, using the typical Woessner formula for complex compounds, allow to conclude that the low-temperature minimum is due to the relaxation of all CH3 groups and the other two minima are due to the relaxation of two and four NH3 groups, respectively. This assignment is based on the X-ray results showing that methylammonium cations are differently bonded in this crystal.
Adres publiczny
https://10.1016/0926-2040(93)90025-i
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