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. 2016 Nov 16;6:36932. doi: 10.1038/srep36932

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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The IR (A,C) and excess IR (B,D) spectra of NMF-DMSO-d₆ (A,B) and NMA-DMSO-d₆ (C,D) systems in the range of N−H and C−H stretching vibration region. The short-dashed line and dashed line in (A,C) depict the spectra of pure NMF/NMA and DMSO-d₆. The vertical dashed lines are used to guide eyes. The horizontal dashed lines in (B,D) are relative baselines for respective excess IR spectra. From top to bottom in (A,C) the mole fraction of DMSO-d₆ increases from 0 to 1. The precise mole fractions are labeled in (B,D).