title: Raman study of low-frequency modes in three glycine polymorphs.
abstract: The temperature dependence of selected low-wavenumber (< 200 cm(-1)) Raman bands was studied for the different crystalline phases (α-, β-, γ-) of glycine--the simplest possible "building block" of a biomolecule. The temperature dependence of the frequencies of vibrational modes deviates from the theoretical expectation based on the assumption of cubic anharmonicity. Although relatively small, this deviation was observed above 250 K for all the three polymorphs. This finding was discussed in relation to the "dynamical transition" phenomenon, observed in variety of biomolecules in the range 200-250 K. The similarity of the temperatures suggests, that the origin of the dynamical transition phenomenon can be related to intrinsic conformational states of biomolecules, while water serves rather as a plasticizer or a structure organizer.
authors.affiliation: Institute of Automation and Electrometry, Russian Academy of Sciences, Novosibirsk 630090, Russia. lab21@iae.nsk.su
authors.forename: N V
authors.initials: NV
authors.lastname: Surovtsev
authors.forename: V K
authors.initials: VK
authors.lastname: Malinovsky
authors.forename: E V
authors.initials: EV
authors.lastname: Boldyreva
mesh_terms: D005998:Glycine / Q000737:chemistry*; D044367:Phase Transition; D012542:Scattering, Radiation; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013696:Temperature; D014732:Vibration
chemical_list: D005998:Glycine