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- W2019919440 abstract "Molecular dynamics of polycrystalline α-l-fucopyranose and methyl α-l-fucopyranoside have been investigated using 13C and 1H spin relaxation times over a range of temperatures (90−400 K). For methyl α-l-fucopyranoside at 300 K, both methoxyl and methyl groups had much shorter 13C T1 than the carbons in the pyran ring. 13C T1 relaxation measurements (at 74.56 MHz) as a function of temperature enabled characterization of the 3-fold rotations of the methoxyl (Ea ∼ 9 kJ/mol, τc ∼ 0.7 × 10-13 s) and methyl (Ea ∼ 9 kJ/mol, τc ∼ 2 × 10-13 s) groups. Proton T1 (100 MHz) measurements of methyl α-l-fucopyranoside showed that the relaxation processes (Ea ∼ 11 kJ/mol, τc ∼ 0.7 × 10-13 s), corresponding to rotations of the methoxyl and methyl groups, are not distinguishable and occurred together at about 131 K. For α-l-fucopyranose, proton T1 showed a relaxation rate maximum at 224 K, attributed to the 3-fold rotation of methyl group (Ea ∼ 15 kJ/mol, τ0 ∼ 2.6 × 10-13 s). The rotation processes of the methyl groups dominated T1ρ processes for both saccharides and appeared at the low-temperature end (90−150 K) of the temperature range. Contributions of hydroxyl groups to both T1 and T1ρ processes were obscured by the overwhelming relaxation efficiency of methyl groups. The proton second moment showed a reduction to a lower value at about 150 K due to the rotation of methyl groups." @default.
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- W2019919440 date "2002-11-13" @default.
- W2019919440 modified "2023-10-01" @default.
- W2019919440 title "Solid State NMR Studies of the Molecular Motions in the Polycrystalline α-<scp>l</scp>-Fucopyranose and Methyl α-<scp>l</scp>-Fucopyranoside" @default.
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- W2019919440 doi "https://doi.org/10.1021/jp0268617" @default.
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