Molecular dynamics of the methylammonium cation in [CH3NH3]5Bi2Cl11

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...

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Bibliographic Details
Published in:Solid state nuclear magnetic resonance 1993-09, Vol.2 (4), p.197-200
Main Authors: Medycki, W, Piślewski, N, Jakubas, R
Format: Article
Language:English
Subjects:
Cations - chemistry
Chemical Phenomena
Chemistry, Physical
Fractals
Hydrogen Bonding
Magnetic Resonance Spectroscopy
Methylamines - chemistry
Models, Chemical
Temperature
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Summary: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.
ISSN:0926-2040
DOI:10.1016/0926-2040(93)90025-i