Density Functional Calculations on a Double Hydrogen Bonded Dimer of (p-Methoxyphenyl)thiosemicarbazide

• Autorzy: Zhao, P. , Li, R. , Zhang, L. , Jian, F.
• Języki publikacji: EN

Abstrakty

EN

Density functional theory (DFT) calculations on a double hydrogen-bonded dimer of (p-methoxyphenyl)thiosemicarbazide were carried out at B3LYP/6-31G* level. The optimized geometry of the dimer closely resembles that in the crystal. The calculated results show that the total energy of the dimer is much lower than the sum of energies of the two monomers, and the average strength of the double hydrogen bond is about 21.92 kJ/mol. In order to probe the origin of the interactions in the dimer, natural bond orbital analyses have been performed. The thermodynamic properties of the title compound at different temperatures have also been calculated on the basis of vibrational analyses and the change of Gibbs free energy for dimerization of the twomonomers.GT = –18.40 kJ/mol at 298.15 K and 0.1MPa, which implies the spontaneous process of the dimer formation. The correlation graphs of Sm 0, Hm 0 and temperatures for the dimer are depicted.

Słowa kluczowe

EN

hydrogen bonded dimer; density functional theory; natural bond orbital; thermodynamic properties

• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2006
• Tom: Vol. 80, nr 12
• Strony: 2031-2039
• Opis fizyczny: Bibliogr. 23 poz., rys.

Twórcy

autor

Zhao, P.

autor

Li, R.

autor

Zhang, L.

autor

Jian, F.

• Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials Huaiyin Teachers College, Huaian, Jiangsu, 223300, China

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