The effect of temperature and solvation on the ultrafast dynamics of N-methylacetamide

被引：18
|
作者：
Hunt, Neil T. [1 ]
Wynne, Klaas [1 ]
机构：
[1] Univ Strathclyde, SUPA, Dept Phys, Glasgow G4 0NG, Lanark, Scotland
来源：
CHEMICAL PHYSICS LETTERS | 2006年 / 431卷 / 1-3期
基金：
英国工程与自然科学研究理事会;
关键词：
D O I：
10.1016/j.cplett.2006.09.084
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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. (c) 2006 Elsevier B.V. All rights reserved.
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页码：155 / 159
页数：5
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