Ab initio studies on geometry and vibrational spectra of N-methyl formamide and N-methylacetamide

Nandini, G and Sathyanarayana, DN (2002) Ab initio studies on geometry and vibrational spectra of N-methyl formamide and N-methylacetamide. In: Journal of Molecular Structure: THEOCHEM, 579 (1-3). pp. 1-9.

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Abstract

The molecular conformation, ground state molecular vibrations and force field of N-methylformamide (NMF) and N-methylacetamide (NMA) have been studied by the ab initio method at the Hartree–Fock level using the $6-31+g^*$ basis set. The potential energy surface of NMA is investigated by the ab initio method with full geometry optimization. For both the molecules, trans conformer was found to be the most stable. For trans-NMF, methyl group in the staggered conformation and for trans-NMA, methyl groups in cis–trans position with respect to –CONH– group represent global minima. The vibrational spectral analysis has been carried out for both NMF and NMA. Comparisons with the previous assignments for amide bands have been made. The present results are compared with the previous results of structure and vibrational spectra and discussed.

Item Type:	Journal Article
Publication:	Journal of Molecular Structure: THEOCHEM
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	N-Methylformamide;N-Methylacetamide;Ab initio method;Normal co-ordinate analysis
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	02 Jun 2006
Last Modified:	19 Sep 2010 04:29
URI:	http://eprints.iisc.ac.in/id/eprint/7494

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