Synthesis, structural exploration, spectral and combinatorial analysis of racemic-3-isobutyl-5-phenyl-5-(pyridin-4-yl)imida-zolidine-2,4dione: Comparison between experimental and DFT calculations

New racemic 3-isobutyl-5-phenyl-5-(pyridin-4-yl)imidazolidine-2,4-dione was synthesized, isolated,
characterized spectrally, thermally and finally the structure was confirmed by X-ray diffraction studies.
Both XRD and DFT/B3LYP/6-31G(d,p) optimized structures of the compound revealed the diketo
monomer as favored tautomer isomer structure. The molecular geometry optimization parameters were
compared with the experimental XRD results. The electronic spectrum which allocated basis of the TDSCF
result and the MO energy level diagram were compared with the experimental one. The electrophilic
and nucleophilic receptors and acceptor functional groups with their interactions on the molecule surface
was established by packing diagrams and then compared with Hirshfeld surface, electrostatic potential
map and Mullikan population theoretical calculations. The experimental H NMR results, compared to the theoretical ACD-lab and NMR-db showed an excellent agreement. The desired organic
compound revealed a high thermal stability in an open atmosphere.