The effect of temperature and solvation on the ultrafast dynamics of n-methylacetamide
Hunt, N.T. and Wynne, K. (2006) The effect of temperature and solvation on the ultrafast dynamics of n-methylacetamide. Chemical Physics Letters, 431. pp. 155-159. ISSN 0009-2614 (https://doi.org/10.1016/j.cplett.2006.09.084)
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The ultrafast dynamics of N-methylacetamide (NMA), a peptide-linkage model compound, are reported for the first time as a function of temperature and dilution. The rotational-diffusive timescale of NMA was observed to behave in a manner inconsistent with established hydrodynamic theory for simple liquids, exhibiting sharp decreases at elevated temperatures and low concentrations. These were associated with non-stoichiometric changes in far-infrared and terahertz Raman transition strengths. The data is consistent with a model in which neat NMA forms hydrogen bonded aggregates, featuring cooperative effects upon the polarizability and dipole moment that are disrupted by increased temperature or decreased NMA mole fraction.
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Item type: Article ID code: 10169 Dates: DateEvent2006PublishedSubjects: Science > Physics Department: Faculty of Science > Physics Depositing user: Strathprints Administrator Date deposited: 11 Oct 2011 09:42 Last modified: 08 Apr 2024 16:42 URI: https://strathprints.strath.ac.uk/id/eprint/10169