A comparative study on 4-(4-(3-mesityl-3-methylcyclobutyl)thiazole-2-yl)-1-thia-4-azaspiro[4.5]decan-3-one: Experimental and density functional methods

•A novel cyclobutane compound was synthesized.•It was brought to light the molecular structure by X-ray diffraction.•The compound was characterized by FT-IR and NMR spectroscopies.•Geometric parameters, vibrational frequencies and chemical shifts were calculated by DFT methods.•Experimental data was supported by theoretical and literature values.

In the present study, combined experimental and computational study on molecular structure and spectroscopic assignments of title compound has been reported. The crystal was synthesized and its molecular structure brought to light by X-ray single crystal structure determination method. The spectroscopic properties of the compound were examined by FT-IR and NMR (1H and 13C) techniques. FT-IR spectrum in solid state was observed in the region 4000–400 cm−1. The 1H and 13C NMR spectra were recorded in Acetone-d6 and CDCl3 solvents. The molecular geometry were those obtained from the X-ray structure determination was optimized using Density Functional Theory (DFT/B3LYP) method with the 6-31G(d, p) and 6-31+G(d, p) basis sets in ground state. From the optimized geometry of the molecule, geometric parameters (bond lengths, bond angles and torsion angles), vibrational assignments and chemical shifts of the title compound have been calculated theoretically and compared with the experimental data.

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