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Title: | Vibrational conformational analysis of ethyl formate | Authors: | MAES, I. Herrebout, W.A. van der Veken, B.J. |
Issue Date: | 1994 | Publisher: | John Wiley & Sons, Ltd. | Source: | Journal of Raman spectroscopy, 25(7-8). p. 679-691 | Abstract: | Infrared (4000-50 cm-1) spectra of gaseous, amorphous and crystalline ethyl formate, HCOOCH2CH3, were recorded. Raman spectra of the gaseous, liquid and solid phases were investigated from 3500 to 25 cm-1. Additionally, qualitative depolarization ratios were obtained from the Raman spectra of the liquids. Ab initio calculations were carried out using a 4-21G basis set and show that the compound can occur as four possible conformers, s-cis trans, s-cis, gauche, s-trans trans and s-trans, gauche. Their optimized structural parameters, their force field and the vibrational wavenumbers and potential energy distributions were calculated for each conformer. Additionally, the potential function governing internal rotation from the s-trans, trans to the s-cis trans conformation was calculated. Both the s-cis conformers were identified in the vibrational spectra of the gaseous, amorphous and fluid phases, and there are strong indications that a weak band at 623.5 cm-1 in the Raman spectrum of the fluid phases is due to one of the s-trans conformers. From a temperature study of the Raman spectrum of the liquid, the enthalpy difference between the cis, trans and s-cis gauche conformers was determined to be 1.4 ± 0.4 kJ mol-1 with the trans conformer being the more stable rotamer. Vibrational spectra of the crystalline solid, which consists only of the s-cis, trans conformer, showed that ethyl formate can crystallize in two different forms. A complete assignment of the vibrational fundamentals from the infrared and Raman spectra is proposed. | Document URI: | http://hdl.handle.net/1942/5165 | DOI: | 10.1002/jrs.1250250731 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
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