کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9591351 | 1507019 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Trans-ethylphosphine and selected deuterated isotopomers: prediction of infrared spectra and potential energy distribution determination
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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, ÎG0 for the transâgauche 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 CH3CH2PH2 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure: THEOCHEM - Volume 715, Issues 1â3, 28 February 2005, Pages 21-31
Journal: Journal of Molecular Structure: THEOCHEM - Volume 715, Issues 1â3, 28 February 2005, Pages 21-31
نویسندگان
Hae-Won Kim, Daniel Zeroka,