Trans-ethylphosphine and selected deuterated isotopomers

Prediction of infrared spectra and potential energy distribution determination

Hae-Won Kim, Daniel Zeroka

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2 Citations (Scopus)

Abstract

The normal mode frequencies of isotopomers of trans- and gauche-ethylphosphine and its deuterated species are determined using the gaussian 98 quantum chemistry code. The calculations were performed at the Hartree-Fock, second-order Møller-Plesset and density functional levels with the 6-311G** basis set. The trans conformer was more stable than the gauche conformer by 2.24 kJ/mol at the DFT level theory. At 25°C, ΔG0 for the trans→gauche equilibrium is 2.06 kJ/mol and the relative population of gauche:trans conformers is 46.6%. The effect of deuterations of the hydrogen atoms in each functional group, separately and in combination, is studied. A comparison was made with the experimental infrared spectra for trans and gauche conformers of CH3CH2PH 2 and CH3CH2PD2. For the trans conformer of eight isotopomers of ethylphosphine, potential energy distributions were determined using the program MOLVIB and Kim's Correspondence Rules of unified group theory. The PED results were used to assign predominant vibrational motions for the trans conformer. The RMS deviation of calculated frequencies from experimental values is reported. The average scaling factors for all vibrational motions for CH3CH2PH2 and CH3CH2PD2 are 0.9197 for HF, 0.9534 for MP2 and 0.9860 for DFT. These average scaling factors are very similar to those previously determined for methylphosphine.

Original languageEnglish (US)
Pages (from-to)21-31
Number of pages11
JournalJournal of Molecular Structure: THEOCHEM
Volume715
Issue number1-3
DOIs
StatePublished - Feb 28 2005

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Potential energy
Discrete Fourier transforms
energy distribution
infrared spectra
potential energy
Infrared radiation
scaling
Group theory
Quantum chemistry
group theory
quantum chemistry
predictions
Functional groups
Hydrogen
hydrogen atoms
deviation
Atoms
energy
Population

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

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title = "Trans-ethylphosphine and selected deuterated isotopomers: Prediction of infrared spectra and potential energy distribution determination",
abstract = "The normal mode frequencies of isotopomers of trans- and gauche-ethylphosphine and its deuterated species are determined using the gaussian 98 quantum chemistry code. The calculations were performed at the Hartree-Fock, second-order M{\o}ller-Plesset and density functional levels with the 6-311G** basis set. The trans conformer was more stable than the gauche conformer by 2.24 kJ/mol at the DFT level theory. At 25°C, ΔG0 for the trans→gauche equilibrium is 2.06 kJ/mol and the relative population of gauche:trans conformers is 46.6{\%}. The effect of deuterations of the hydrogen atoms in each functional group, separately and in combination, is studied. A comparison was made with the experimental infrared spectra for trans and gauche conformers of CH3CH2PH 2 and CH3CH2PD2. For the trans conformer of eight isotopomers of ethylphosphine, potential energy distributions were determined using the program MOLVIB and Kim's Correspondence Rules of unified group theory. The PED results were used to assign predominant vibrational motions for the trans conformer. The RMS deviation of calculated frequencies from experimental values is reported. The average scaling factors for all vibrational motions for CH3CH2PH2 and CH3CH2PD2 are 0.9197 for HF, 0.9534 for MP2 and 0.9860 for DFT. These average scaling factors are very similar to those previously determined for methylphosphine.",
author = "Hae-Won Kim and Daniel Zeroka",
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T1 - Trans-ethylphosphine and selected deuterated isotopomers

T2 - Prediction of infrared spectra and potential energy distribution determination

AU - Kim, Hae-Won

AU - Zeroka, Daniel

PY - 2005/2/28

Y1 - 2005/2/28

N2 - The normal mode frequencies of isotopomers of trans- and gauche-ethylphosphine and its deuterated species are determined using the gaussian 98 quantum chemistry code. The calculations were performed at the Hartree-Fock, second-order Møller-Plesset and density functional levels with the 6-311G** basis set. The trans conformer was more stable than the gauche conformer by 2.24 kJ/mol at the DFT level theory. At 25°C, ΔG0 for the trans→gauche equilibrium is 2.06 kJ/mol and the relative population of gauche:trans conformers is 46.6%. The effect of deuterations of the hydrogen atoms in each functional group, separately and in combination, is studied. A comparison was made with the experimental infrared spectra for trans and gauche conformers of CH3CH2PH 2 and CH3CH2PD2. For the trans conformer of eight isotopomers of ethylphosphine, potential energy distributions were determined using the program MOLVIB and Kim's Correspondence Rules of unified group theory. The PED results were used to assign predominant vibrational motions for the trans conformer. The RMS deviation of calculated frequencies from experimental values is reported. The average scaling factors for all vibrational motions for CH3CH2PH2 and CH3CH2PD2 are 0.9197 for HF, 0.9534 for MP2 and 0.9860 for DFT. These average scaling factors are very similar to those previously determined for methylphosphine.

AB - The normal mode frequencies of isotopomers of trans- and gauche-ethylphosphine and its deuterated species are determined using the gaussian 98 quantum chemistry code. The calculations were performed at the Hartree-Fock, second-order Møller-Plesset and density functional levels with the 6-311G** basis set. The trans conformer was more stable than the gauche conformer by 2.24 kJ/mol at the DFT level theory. At 25°C, ΔG0 for the trans→gauche equilibrium is 2.06 kJ/mol and the relative population of gauche:trans conformers is 46.6%. The effect of deuterations of the hydrogen atoms in each functional group, separately and in combination, is studied. A comparison was made with the experimental infrared spectra for trans and gauche conformers of CH3CH2PH 2 and CH3CH2PD2. For the trans conformer of eight isotopomers of ethylphosphine, potential energy distributions were determined using the program MOLVIB and Kim's Correspondence Rules of unified group theory. The PED results were used to assign predominant vibrational motions for the trans conformer. The RMS deviation of calculated frequencies from experimental values is reported. The average scaling factors for all vibrational motions for CH3CH2PH2 and CH3CH2PD2 are 0.9197 for HF, 0.9534 for MP2 and 0.9860 for DFT. These average scaling factors are very similar to those previously determined for methylphosphine.

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