Molecular structures and vibrational frequencies of 2-, 3- and 4-pyridine carboxaldehydes by ab initio Hartree-Fock and density functional theory calculations

---

Atıf İçin Kopyala

Saǧlam A., UCUN F., Güçlü V.

Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, cilt.67, sa.2, ss.465-471, 2007 (SCI-Expanded)

• Yayın Türü: Makale / Tam Makale
• Cilt numarası: 67 Sayı: 2
• Basım Tarihi: 2007
• Doi Numarası: 10.1016/j.saa.2006.08.005
• Dergi Adı: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
• Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
• Sayfa Sayıları: ss.465-471
• Anahtar Kelimeler: DFT, HF, IR spectra, Pyridine carboxaldehydes, Raman spectra, Vibrations
• İstanbul Gelişim Üniversitesi Adresli: Hayır

Özet

The optimised molecular structures, vibrational frequencies and corresponding vibrational assignments of the cis and trans conformers of 2-, 3- and 4-pyridine carboxaldehydes have been calculated using ab initio Hartree-Fock (HF) and density functional theory (B3LYP) methods with 6-311++G(d, p) basis set. The calculations were adapted to the CS symmetries of all the molecules. The mean vibrational deviations between the vibrational frequency values of the two conformers of all the compounds have been seen to increase while the relative energies increase and it was concluded the more different the molecular structure of the two conformers is the higher the relative energy is between them, and thus a bigger mean vibrational deviation. © 2006 Elsevier B.V. All rights reserved.