期刊
JOURNAL OF CHEMICAL PHYSICS
卷 134, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3524342
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资金
- RFBR [09-03-00588, 09-03-00451]
- Siberian Branch of RAS [109]
- BRHE [RUX0-008-NO-06]
The temperature dependence of selected low-wavenumber (< 200 cm(-1)) Raman bands was studied for the different crystalline phases (alpha-, beta-, gamma-) 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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3524342]
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