title: Molecular dynamics in solid pyridoxine as studied by 1H NMR.
abstract: Spin-lattice relaxation times T1 and T1d as well as NMR second moment were employed to study molecular dynamics of pyridoxine (vitamin B6) in the temperature range 10-350 K. The T1 minimum observed at low temperatures at 200 MHz is attributed to a motion of methyl group. The motion is interpreted in terms of Haupt's theory, which takes into account the tunneling assisted relaxation. At low temperatures, where T1 is temperature independent, occupation of the ground state only is assumed. A motion of proton of the hydroxyl groups or CH2OH groups probably provides additional mechanism of relaxation, in the high-temperature region.
authors.affiliation: Institute of Physics, A. Mickiewicz University, Ul. Umultowska 85, 61-614 Poznań, Poland. glow@amu.edu.pl
authors.forename: S
authors.initials: S
authors.lastname: Głowinkowski
authors.forename: B
authors.initials: B
authors.lastname: Peplińska
authors.forename: S
authors.initials: S
authors.lastname: Jurga
mesh_terms: D003460:Crystallization / Q000379:methods*; D003461:Crystallography / Q000379:methods*; D007700:Kinetics; D009038:Motion; D011487:Protein Conformation; D011489:Protein Denaturation; D011522:Protons; D011736:Pyridoxine / Q000737:chemistry*; D013696:Temperature
chemical_list: D011522:Protons; D011736:Pyridoxine