DFT STUDY OF KINET IC AND THERMODYNAMIC PARAMETERS OF TAUTOMERISM IN 4−ACYL PYRAZOLONE

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TAVAKOL H.; MOHAMMADI H.; ASLANZADEH S.A.

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Journal: Iranian Journal of Mathematical Chemistry Year:2013 | Volume:4 | Issue:2 Page(s): 185-199

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Title

DFT STUDY OF KINET IC AND THERMODYNAMIC PARAMETERS OF TAUTOMERISM IN 4−ACYL PYRAZOLONE

Author(s)

TAVAKOL H. | MOHAMMADI H. | ASLANZADEH S.A. | Issue Writer Certificate

Keywords

PYRAZOLONEQ2

DFTQ2

TAUTOMERQ2

SOLVENT EFFECTQ2

Abstract

In the present work, DFT calculations are employed to obtain the optimized structures of 4-acyl PYRAZOLONE TAUTOMERs (19 TAUTOMERs) using B3LYP/6-311++G** calculations. In addition, molecular parameters, IR frequencies and relative energies are extracted for all TAUTOMERs. The existence of aromatic ring, keto TAUTOMER (versus enol TAUTOMER), N-H bond (versus C-H bond) and C=N double bond (versus N=N double bond) are stabilizing factors in relative stabilities of TAUTOMERs. Calculation of vibrational frequencies showed that, in accordance with reported values, intramolecular hydrogen bond (existed in some TAUTOMERs) decreased the value of OH frequency. The SOLVENT EFFECTs on relative stabilities of TAUTOMERs are calculated. The relative stabilities of all the TAUTOMERs in acetone, tetrahydrofurane and chloroform (in all solvents, except water) were relatively the same as those in the gas phase. In addition, a nearly good relationship is found between dipole moments of TAUTOMERs and their DGsolv in chloroform. This relation shows that by increasing the dipole moment, the absolute amount of DGsolv in chloroform increases.

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APA: Copy

TAVAKOL, H., MOHAMMADI, H., & ASLANZADEH, S.A.. (2013). DFT STUDY OF KINET IC AND THERMODYNAMIC PARAMETERS OF TAUTOMERISM IN 4?ACYL PYRAZOLONE. IRANIAN JOURNAL OF MATHEMATICAL CHEMISTRY, 4(2), 185-199. SID. https://sid.ir/paper/205625/en

Vancouver: Copy

TAVAKOL H., MOHAMMADI H., ASLANZADEH S.A.. DFT STUDY OF KINET IC AND THERMODYNAMIC PARAMETERS OF TAUTOMERISM IN 4?ACYL PYRAZOLONE. IRANIAN JOURNAL OF MATHEMATICAL CHEMISTRY[Internet]. 2013;4(2):185-199. Available from: https://sid.ir/paper/205625/en

IEEE: Copy

H. TAVAKOL, H. MOHAMMADI, and S.A. ASLANZADEH, “DFT STUDY OF KINET IC AND THERMODYNAMIC PARAMETERS OF TAUTOMERISM IN 4?ACYL PYRAZOLONE,” IRANIAN JOURNAL OF MATHEMATICAL CHEMISTRY, vol. 4, no. 2, pp. 185–199, 2013, [Online]. Available: https://sid.ir/paper/205625/en

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