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Maiti, Kiran Sankar (2020): Ultrafast vibrational coupling between C-H and C=O band of cyclic amide 2-Pyrrolidinone revealed by 2DIR spectroscopy. In: Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy, Vol. 228, 117749
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Coupling between C-H and C=O vibrational modes play an essential role on determination of biological structure and dynamics. However, due to the weakness of the C-H absorption and strong absorption of the C=O vibrational band make such experiments less straightforward than those with transitions of nearly the same strength. In this communication the characteristics of the C-H and C=O coupling has been studied using dual frequency two dimensional infrared spectroscopy. 2-Pyrrolidinone has been used as a model molecule of biological system. The coherent and incoherent couplings between C-H and C=O vibrational bands have been observed. The cross peaks dynamics have been discussed and time constant of the cross peak intensity has been calculated. (c) 2019 Elsevier B.V. All rights reserved.