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The title compound, C21H23F2NO, consists of two fluorophenyl groups and one butyl group equatorially oriented on a piperidine ring, which adopts a chair conformation. The dihedral angle between the mean planes of the phenyl rings is 72.1 (1)°. In the crystal, N--H…O and weak C--H…F interactions, which form R2 2 [14] motifs, link the molecules into infinite C(6) chains propagating along [001]. Aweak C--H…τ interaction is also observed. A Hirshfeld surface analysis of the crystal structure indicates that the most significant contributions to the crystal packing are from H…H (53.3%), H…C/C…H (19.1%), H…F/ F…H (15.7%) and H…O/O…H (7.7%) contacts. Density functional theory geometry-optimized calculations were compared to the experimentally determined structure in the solid state and used to determine the HOMO-LUMO energy gap and compare it to the UV-vis experimental spectrum. [ABSTRACT FROM AUTHOR]

The syntheses and crystal structure of 3-chloro-3-methyl-r-2,c-6-diphenylpiperidin-4-one, C18H18ClNO, (I), 3-chloro-3-methyl-r-2,c-6-di-p-tolylpiperidin-4-one, C20H22ClNO, (II), and 3-chloro-3-methyl-r-2,c-6-bis(4-chlorophenyl)piperidin-4-one, C18H16Cl3NO, (III), are described. In each structure, the piperidine ring adopts a chair conformation and dihedral angles between the mean planes of the phenyl rings are 58.4 (2), 73.5 (5) and 78.6 (2)° in (I), (II) and (III), respectively. In the crystals, molecules are linked into C(6) chains by weak N-H···O hydrogen bonds and C-H···π interactions are also observed. [ABSTRACT FROM AUTHOR]

A newly synthesized molecular complex 3-chloro-3-methyl-2,6-diphenylpiperidin-4-one [CMDP] crystallizes in the triclinic space group P1. The piperidin-4-one ring exhibits a distorted chair conformation with the puckering parameters Q = 0.559 (3) Å, θ = 173.3 (3°) and φ = 180 (2°). The methyl substituent on the third position of the piperidine ring takes up a syn -periplanar positioning although the chloro substituent takes up an anti-clinical positioning with dihedral angle: Cl1–C2–C1–O1 = 113.3 (2°) due to the repulsion from an adjacent oxygen atom. The optimized molecular geometry and fundamental vibrational frequencies of the CMDP compounds are interpreted with the help of normal coordinate force field calculations based on DFT method B3LYP/6-31+G (d,p) level basis set. The HOMO-LUMO energy gap of the molecule is 5.4194 eV. The hardness value (η) of the CMDP molecule is 2.7097 eV. Hirshfeld surface analysis and fingerprint plots are supportive for determining the molecular shape and visually analyzing the intermolecular interactions in the crystal structure. The Hirshfeld surfaces like d i , d e , d norm , shape index and curvedness of C 18 H 18 NOCl were pictured and discussed. The various levels of electronic transitions have been predicted by Time-Dependent Density Functional Theory (TD-DFT) calculations and compared with the recorded absorption spectrum. Molecular docking study was performed and reported for the synthesized compound against 4ey7 protein. Unlabelled Image • The title compound (C 18 H 18 NOCl) was characterized by FT-IR, NMR, XRD, FT-Raman and UV–Visible spectrum. • Chemical activity, MEP and NLO were investigated by DFT method. • UV–visible spectrum, HOMO and LUMO and Hirshfeld surface discussed. • A detailed comparison study was done on vibrational spectra. • Molecular docking study of C 18 H 18 NOCl with 4ey7 protein analyzed and reported. [ABSTRACT FROM AUTHOR]