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- W2049616388 abstract "Proton NMR spin–lattice relaxation times in the laboratory frame (T1) and in the rotating frame (T1ρ) were measured as a function of temperature for a static sample of α-glycine. Both T1 and T1ρ data can be fit quantitatively by a single thermally-activated motion (the modulation of the dipolar coupling by random hopping about the threefold axis of the –NH3 group), with no addition of other mechanisms at any temperature between 173 and 415 K. An activation energy of 21.7 ± 1 kJ/mol was extracted and is compared with previously reported values for both α- and γ-glycine. Such comparisons allow the correction of glycine polymorphs misidentified in the literature. The minimum in T1 at 325 K corresponds to a correlation time of 0.53 ns. Chemical shifts as a function of temperature were measured by 1H CRAMPS and by 13C and 15N CP/MAS experiments. These results are discussed relative to a previous report of anomalous electrical behavior in α-glycine within this temperature range." @default.
- W2049616388 created "2016-06-24" @default.
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- W2049616388 date "2008-10-01" @default.
- W2049616388 modified "2023-09-27" @default.
- W2049616388 title "Variable temperature NMR characterization of α-glycine" @default.
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- W2049616388 doi "https://doi.org/10.1016/j.molstruc.2008.02.023" @default.
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