Investigation of molecular structure and solvent/temperature effect on tautomerism in (E)-4,6-dibromo-3-methoxy-2-[(p-tolylimino)methyl] phenol, a new thermochromic Schiff base, by using XRD, FT-IR, UV-vis, NMR and DFT methods
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Tarih
2019
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Pergamon-Elsevier Science Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The molecular structure and the solvent temperature effect on the tautomerism in a new Schiff base, (E)-4,6-clibromo-3-methoxy-2-[(p-tolylimino)methyllphenol, were investigated using spectroscopic (NMR, UV-vis, FT-1R), crystallographic (XRD), computational (DFT and TD-DET) methods and harmonic oscillator model of aromaticity (HOMA). The XRD, DFT and MIR results show that the compound exists in the phenol-imine form in the solid state. HOMA indices support the aromatic structure of the compound. DFT calculations were performed to understand proton transfer process and relatively close values were obtained for the energies of tautomers. UV-vis studies prove the solvent dependence of the tautomerism in the compound by revealing the existence of both phenol-imine and keto-amine forms in polar solvents and only the phenol-imine form in apolar solvent. The TD-DFT results for the electronic transitions lead to the same conclusion as the absorption spectra. H-1 NMR and C-13 NMR studies at room and low (-60 degrees C) temperatures indicate that the tautomeric equilibrium occurs rapidly in the compound. Therefore, it is difficult to observe two tautomers. However, the presence of tautomeric structures is clearly seen in acetone d(6), alternatively underlying the solvent and temperature dependence of tautomerism in the title compound. (C) 2019 Elsevier B.V. All lights reserved.
Açıklama
Anahtar Kelimeler
Schiff Base, Tautomerism, Solvent effect, Temperature effect, Thermochromism, Spectroscopy, Computational methods
Kaynak
Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
222
