Theoretical and experimental investigation of (E)-2-([3,4-dimethylphenyl)imino]methyl)-3-methoxyphenol: Enol–keto tautomerism, spectroscopic properties, NLO, NBO and NPA analysis

• A detailed interpretation of FT-IR spectra and the effect of various organic solvents with different polarities on the UV–vis spectra has been studied. • Mulliken population method, natural population analysis (NPA) and NBO were performed.