Quantum Calculation for Musk Molecules Infrared Spectra towards the Understanding of Odor. (7th September 2014)

• Record Type: Journal Article
• Authors: Maia, Elaine Rose; Magalhães, Daniela Regina Bazuchi; Lerner, Dan A.; Berthomieu, Dorothée; Bernassau, Jean-Marie
• Other Names: Di Tommaso Devis Academic Editor.
• Is Part Of: Advances in chemistry. Volume 2014(2014)
• Publication Date: 2014-09-07
• Subjects: Chemistry -- Periodicals; Chemistry; Periodicals; 540
• DOI: 10.1155/2014/398948
• Languages: English
• ISSNs: 2356-6612

Abstract

Abstract : It is not clear so far how humans can recognize odor. One of the theories regarding structure-odor relationship is vibrational theory, which claims that odors can be recognized by their modes of vibration. In this sense, this paper brings a novel comparison made between musky and nonmusky molecules, as to check the existence of correlation between their modes on the infrared spectra and odor. For this purpose, sixteen musky odorants were chosen, as well as seven other molecules that are structurally similar to them, but with no musk odor. All of them were submitted to solid theoretical methodology (using molecular mechanics/molecular dynamics and Neglect of Diatomic Differential Overlap Austin Model 1 methods to optimize geometries) as to achieve density functional theory spectra information, with both Gradient Corrected Functional Perdew-Wang generalized-gradient approximation (GGA/PW91) and hybrid Becke, three-parameter, Lee-Yang-Parr (B3LYP) functional. For a proper analysis over spectral data, a mathematical method was designed, generating weighted averages for theoretical frequencies and computing deviations from these averages. It was then devised that musky odorants satisfied demands of the vibrational theory, while nonmusk compounds belonging either to nitro group or to acyclic group failed to fulfill the same criteria.