Citation: SHI Ji-Pei, ZHAO Juan, YANG Fan, WANG Jian-Ping. Femtosecond Two-Dimensional Infrared Spectroscopy of N-Ethypropionamide[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201302213
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Femtosecond two-dimensional infrared (2D IR) spectroscopy, steady-state infrared spectroscopy, and computational methods are used to examine the ultrafast structural dynamics of a β-peptide model compound, N-ethylpropionamide (NEPA). NEPA has amide-I vibrational characteristics similar to that in an α-peptide, which shows sensitivity to molecular structure and chemical environment. The 2D IR spectral dynamics reveal a spectral diffusion time of ~1 ps, which is believed to be consistent with the time scale of the structural dynamics of the amide-water hydrogen bond.
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