Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. , Quality Control of 11-Aminoundecanoic acid, 2432-99-7, Name is 11-Aminoundecanoic acid, molecular formula is C11H23NO2, belongs to amides-buliding-blocks compound. In a document, author is Yu, Pingfeng, introduce the new discover.
Comparative study of hydrogen bonding interactions between N-methylacetamide and Methyl Acetate/Ethyl Formate
Hydrogen bonding interactions in N-methylacetamide (NMA) and methyl acetate (MA) system were studied by a combined application of infrared spectroscopy, excess infrared spectroscopy, and quantum chemical calculation. The ethyl formate (EF) and NMA system was also investigated as a comparison. The two systems show similar conclusions: The strength of hydrogen bonds was weakened during the dilution process. The aggregation of NMA break into oligomer and monomer, which interact with MA/EF, simultaneously. Continuous adding MA/EF, NMA oligomer transform into monomers, and they exist in the form of NMA MA/EF complexes. Besides, some differences were existed in the two systems. The hydrogen bonds in NMA MA system are stronger than those in NMA EF system. Comparing the excess spectra of the two systems, more oligomers In NMA MA system transform into NMA MA complexes at the same concentration. Though MA/EF can form cooperative hydrogen bonds, the cooperativity is weaker than that in NMA self-aggregation. This work not only show the hydrogen bonds in NMA MA/EF system but also provide information about the differences between ester C=O and amide I. It is benefit to understand the changes of inserting an ester C=O in protein. (C) 2018 Elsevier B.V. All rights reserved.
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