Synthesis, structural exploration, spectral and combinatorial analysis of racemic-3-isobutyl-5-phenyl-5-(pyridin-4-yl)imida-zolidine-2,4-dione: Comparison between experimental and DFT calculations
摘要:
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 TD-SCF 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-1 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. (C) 2018 Elsevier B.V. All rights reserved.
The structure of the title compound, C14H11N3O2, is reported. The hydantoin ring is nearly planar. Bond distances and angles within the hydantoin ring are similar to those of the known 5,5-diphenylhydantoin. The angles between the hydantoin and the phenyl and pyridyl rings are very unequal, unlike those in 5,5-diphenylhydantoin. There is an intermolecular hydrogen-bonding network involving the amido H atoms as donors and the pyridyl-N atom and one carbonyl-O atom as accepters; there is no intramolecular hydrogen bonding.