Abstract
In this work, synthesis, X-ray single crystal determination, nuclear magnetic resonance (1H NMR and 13C NMR), Ultraviolet–Visible (UV–vis), Fourier transform infrared spectroscopy (FT-IR) and quantum mechanical studies of the 1′,3′,3′-trimethylspiro[benzo[f]chromene-3,2′-indoline [(C23H21NO), TMSBCI] have been both experimentally and theoretically reported. The molecular structure obtained from X-ray single-crystal analysis of the investigated compound in the ground state has been compared using Hartree-Fock (HF) and density functional theory (DFT) with the functional B3LYP using the 6–31G(d,p) as basis set. In addition to the optimized geometrical structures, atomic charges, molecular electrostatic potential (MEP) and natural bond orbital (NBO) have been investigated by using B3LYP/6–31G(d,p) level of the theoretical approximation for the title compound. The energetic behavior of TMSBCI has been examined in solvent media using polarizable continuum model (PCM). The total dipole moment (μ), the average linear polarizability (α), and the first-order hyperpolarisability (β) values of the investigated molecule have been computed using the same method. The experimental measurements (1H NMR, 13C NMR and UV–vis) have been compared with its corresponding the calculated values (using DFT). Besides, frontier molecular orbitals (FMOs) and thermodynamic properties have also been studied.
•1′,3′,3′-trimethylspiro[benzo[f]chromene-3,2'-indoline was synthesised.•The compound has been characterized by IR, 1H NMR, 13C NMR, UV–Vis.•The structure has been studied by single crystal X-ray diffraction method, DFT and HF.•Frontier molecular orbitals (FMOs) and thermodynamic properties have been studied.