Synthesis, spectra, electronic structure, molecular docking and cytotoxicity investigation on 2-(piperidin-1-ylmethyl)-isoindoline-1,3-dione – A Mannich base system.

• Spectroscopic analysis of 2-(piperidin-1-ylmethyl)isoindoline-1,3-dione, a potent anti-cancer activity. • The complete assignments are performed on the basis of the total energy distribution (TED). • Density of state diagrams for title molecule is analyzed. • The possible electrophilic and nucleophilic sites are identified. A Mannich base molecule of 2-(piperidin-1-ylmethyl)isoindoline-1,3-dione (PPF) has been synthesized using Mannich base condensation reaction. The molecular geometry of PPF molecule was optimized by B3LYP/6-311G(d,p) basis set. The vibrational frequencies have been assigned with the aid of normal coordinate analysis. Total energy distributions (TED) were used to explain each vibrational wavenumber assignments of a molecule. The 1H and 13C NMR spectroscopic analyses were predicted by using gauge independent atomic orbital (GIAO) method. The thermal stability was determined by applying the thermo gravimetric/differential scanning calorimetry (TG/DSC) studies. The HOMO-LUMO energies, population density of states (PDOS), overlap population density of states (OPDOS), reduced density gradient (RDG), Mulliken atomic charges and molecular electrostatic potential (MEP) surface were plotted to investigate the van der Waals, attraction, repulsion, non-covalent and covalent interactions of the compound. The natural bond orbital (NBO) charge analysis was used in explaining the intermolecular charge transfer and resonance stabilization energy of molecule. Besides, the molecular docking studies have been performed. The cytotoxic activity of the PPF molecule has been resolved. Image, graphical abstract [ABSTRACT FROM AUTHOR]