Vibrational spectroscopic studies and molecular docking of 10,10-Dimethylanthrone.

FT-IR and FT-Raman spectra of 10,10-Dimethylanthrone were recorded and analyzed. The vibrational wavenumbers were computed using DFT quantum chemical calculations. The data obtained from wavenumber calculations are used to assign vibrational bands obtained experimentally. In its most stable form, the title compound maintains C2v symmetry as determined by XRD results, where both methyl groups are staggered with respect to the corresponding C23-C24 and C23-C28 bonds. The geometrical parameters (B3LYP/6-311++G(d,p)(5D,7F)) of the title compound are in agreement with the XRD results. The calculated HOMO and LUMO energies allow the calculations of atomic and molecular properties and they also showed that charge transfer occurs in the molecule. A detailed molecular picture of the title compound and its interactions were obtained from NBO analysis. As seen from the MEP map, negative potential regions are localized over the carbonyl group and are possible sites for electrophilic attack. The title compound, 10,10-Dimethylanthrone forms a stable complex with human topoisomerase-II as is evident from the ligand-receptor interactions and show appreciable antineoplastic activity.

Spectroscopic investigation (FT-IR, FT-Raman and SERS), vibrational assignments, HOMO-LUMO analysis and molecular docking study of Opipramol.

FT-IR and FT-Raman spectra of Opipramol were recorded and analyzed. SERS spectrum was recorded in silver colloid. The vibrational wave numbers were computed using DFT quantum chemical calculations. The data obtained from wave number calculations are used to assign vibrational bands obtained in infrared and Raman spectra as well as in SERS of the studied molecule. Potential energy distribution was done using GAR2PED program. The geometrical parameters (DFT) of the title compound are in agreement with the XRD results. The presence of CH2 stretching modes in the SERS spectrum indicates the close of piperazine ring with the metal surface and the interaction of the silver surface with this moiety. NBO analysis, HOMO-LUMO, first hyperpolarizability and molecular electrostatic potential results are also reported. The inhibitor Opipramol forms a stable complex with P4502C9 as is evident from the ligand-receptor interactions and a -9.0 kcal/mol docking score and may be an effective P4502C9 inhibitor if further biological explorations are carried out.

Theoretical investigations on the molecular structure, vibrational spectral, HOMO-LUMO and NBO analysis of 9-[3-(Dimethylamino)propyl]-2-trifluoro-methyl-9H-thioxanthen-9-ol.

The experimental FT-IR and FT-Raman spectra of 9-[3-(Dimethylamino)propyl]-2-trifluoro-methyl-9H-thioxanthen-9-ol have been recorded. Quantum chemical calculations of geometry and vibrational wavenumbers of 9-[3-(Dimethylamino)propyl]-2-trifluoro-methyl-9H-thioxanthen-9-ol are carried out theoretically. Four possible stable conformations of the title compound were determined. In terms of the conformational analysis, one of the most interesting structural features of the title compound is the intra molecular OH⋯N hydrogen bond. The barrier of planarity between the most stable and planar form is also predicted. The optimized geometrical parameters obtained by B3LYP method show a good agreement with XRD data. The difference between the observed and theoretical wavenumbers is very small. The complete assignments were performed on the basis of potential energy distribution of the vibrational modes calculated theoretically. The calculated HOMO and LUMO energies allow the calculation of atomic and molecular properties and they also showed that charge transfer occurs in the molecule. A detailed molecular picture of the title compound and its interactions were obtained from NBO analysis. As seen from the MEP map, negative potential regions are over the hydroxyl group and positive potential regions are over the methyl groups.

Vibrational spectroscopic studies (FT-IR, FT-Raman, SERS) and quantum chemical calculations on cyclobenzaprinium salicylate.

FT-IR, FT-Raman and surface enhanced Raman scattering spectra of cyclobenzaprinium salicylate were recorded and analyzed. The vibrational wavenumbers were examined theoretically using the Gaussian09 set of quantum chemistry codes, and the normal modes were assigned by potential energy distribution calculations. The downshift of the OH stretching frequency is due to strong hydrogen bonded system present in the title compound as given by XRD results. The presence of CH3, CH2 and CO2 modes in the SERS spectrum indicates the nearness of the methyl group to the metal surface which affects the orientation and metal molecule interaction. The presence of phenyl ring modes in the SERS spectrum indicates a tilted orientation with respect to the metal surface. The geometrical parameters of the title compound are in agreement with XRD results. A computation of the first hyperpolarizability indicates that the compound may be a good candidate as a NLO material.

Vibrational spectroscopic (FT-IR, FT-Raman, SERS) and quantum chemical calculations of 3-(10,10-dimethyl-anthracen-9-ylidene)-N,N,N-trimethylpropanaminiium chloride (Melitracenium chloride).

FT-IR, FT-Raman spectra of Melitracenium chloride were recorded and analyzed. SERS spectrum was recorded in silver colloid. The vibrational wavenumbers were computed using DFT quantum chemical calculations. The data obtained from wavenumber calculations are used to assign vibrational bands obtained in infrared and Raman spectra as well as in SERS of the studied molecule. Potential energy distribution was done using GAR2PED program. The geometrical parameters (SDD) of the title compound are in agreement with the XRD results. The presence anthracene ring modes in the SERS spectrum suggest a tilted orientation with respect to the metal surface. The methyl groups in the title molecule are also close to the metal surface. The first hyperpolarizability, NBO analysis and molecular electrostatic potential results are also reported.

Diphenyl-methyl benzoate.

In the title mol-ecule, C20H16O2, the dihedral angle between the phenyl rings of the diphenyl-methyl group is 68.3 (2)°. The benzoate group is essentially planar, with a maximum deviation of 0.017 (2) Šfor the carbonyl O atom, and the two phenyl rings are twisted by 27.5 (4) and 85.6 (9)° from this plane. In the crystal, weak C-H⋯O hydrogen bonds link mol-ecules along [100].

Vibrational spectroscopic, molecular structure, first hyperpolarizability and NBO studies of 4'-methylbiphenyl-2-carbonitrile.

The FT-IR, FT-Raman spectra and XRD of 4'-methylbiphenyl-2-carbonitrile were recorded and analyzed. The frequencies were computed at various density functional theoretical levels using Gaussian09 software package. The data obtained from theoretical calculations were used to assign vibrational bands obtained in infrared and Raman spectra of the studied molecule. Potential energy distribution of the normal modes of vibrations were done using GAR2PED program. The geometrical parameters of the title compound are in agreement with XRD crystal structure data. The first hyperpolarizability is comparable with the reported values of similar derivatives and is an attractive object for future studies of non linear optics. The stability of the molecule arising from hyper-conjugative interaction and charge delocalization has been analyzed using NBO analysis. According to XRD data, the dihedral angles between the mean planes of the two benzene rings is 44.7° and the crystal packing is stabilized by weak intermolecular π-π stacking interactions.

3,3-Dimethyl-2-benzofuran-1(3H)-one.

In the title compound, C(10)H(10)O(2), all the non-H atoms except the methyl C atoms lie on a crystallographic mirror plane. In the crystal, C-H⋯O hydrogen bonds link the mol-ecules into zigzag chains running parallel to [100]. Weak π-π stacking inter-actions between the benzene rings [centroid-centroid distance = 3.9817 (5) Å] link the chains in the [010] direction.

[3-(5-Hy-droxy-5H-dibenzo[a,d]cyclo-hepten-5-yl)prop-yl]dimethyl-ammonium 3-carboxyprop-2-enoate.

In the cation of the title salt, C(20)H(24)NO(+)·C(4)H(3)O(4) (-), the N atom in the dimethyl-ammonium group is protonated. The dihedral angle between the mean planes of the two six-membered rings fused to the cyclo-hepten-5-yl ring is 54.4 (1)°. An intra-molecular O-H⋯O hydrogen bond occurs in the anion. The crystal packing is stabilized by inter-molecular O-H⋯O and N-H⋯(O,O) hydrogen bonds and weak C-H⋯O inter-actions, forming a two-dimensional network.

Oxomemazine hydro-chloride.

IN THE TITLE COMPOUND [SYSTEMATIC NAME: 3-(5,5-dioxo-phen-othia-zin-10-yl)-N,N,2-trimethyl-propanaminium chloride], C(18)H(23)N(2)O(2)S(+)·Cl(-), the dihedral angle between the two outer aromatic rings of the phenothia-zine unit is 30.5 (2)°. In the crystal, the components are linked by N-H⋯Cl and C-H⋯Cl hydrogen bonds and C-H⋯π inter-actions.

9-[3-(Dimethyl-amino)-prop-yl]-2-trifluoro-meth-yl-9H-thioxanthen-9-ol.

In the title compound, C(19)H(20)F(3)NOS, the dihedral angle between the mean planes of the two benzene rings attached to the thioxanthene ring is 41.8 (7)°; the latter has a slightly distorted boat conformation. The F atoms are disordered over three sets of sites [occupancy ratio = 0.564 (10):0.287 (10):0.148 (5)] and the methyl groups are disordered over two sets of sites [occupancy ratio = 0.72 (4):0.28 (4)]. The crystal packing is stabilized by O-H⋯N and C-H⋯S hydrogen bonds and weak C-H⋯Cg inter-actions.

2,2-Diphenyl-acetamide.

In the title compound, C(14)H(13)NO, which has two mol-ecules in the asymmetric unit, the dihedral angles between the mean planes of the benzene rings are 84.6 (7) and 85.0 (6)°. N-H⋯O hydrogen bonds [forming R(2) (2)(8) ring motifs] and C-H⋯O hydrogen bonds dominate the crystal packing, forming zigzag chains parallel to the a axis. In addition, weak inter-molecular C-H⋯π inter-actions are observed.

Methyl 2-(4-hy-droxy-benzo-yl)benzoate.

In the title compound, C(15)H(12)O(4), the dihedral angle between the benzene rings is 64.0 (6)°. In the crystal, mol-ecules are linked by O-H⋯O hydrogen bonds, forming C(8) chains propagating in [10[Formula: see text]] and the packing is reinforced by weak C-H⋯O inter-actions.

1-(2-Hy-droxy-eth-yl)-4-{3-[(E)-2-(trifluoro-meth-yl)-9H-thioxanthen-9-yl-idene]prop-yl}piperazine-1,4-diium bis-(3-carb-oxy-prop-2-enoate).

In the title salt, C(23)H(27)F(3)N(2)OS(+)·2C(4)H(3)O(4) (-), a non-merohedral twin [ratio of the twin components = 0.402 (1):0.598 (1)], the -CF(3) group is disordered over two sets of sites with occupancy factors in the ratio 0.873 (2):0.127 (2). The dihedral angle between the two outer aromatic rings of the 9H-thioxanthene unit, whose thio-pyran ring has a screw-boat conformation, is 33.01 (9)°. The diprotonated piperazine ring adopts a chair conformation. In the crystal, inter-molecular O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds between neighboring mol-ecules form zigzag chains along the a axis and contribute to the stabilization of the packing.

1-(2-Hy-droxy-eth-yl)-4-[3-(2-trifluoro-methyl-9H-thioxanthen-9-yl-idene)prop-yl]piperazine-1,4-diium dichloride: the dihydro-chloride salt of flupentixol.

In the title compound, C(23)H(27)F(3)N(2)OS(+)·2Cl(-), the piperazinediium ring adopts a chair conformation. The dihedral angle between the two outer aromatic rings of the 9H-thioxanthene unit is 40.35 (18)°. The F atoms in the trifluoro-methyl group are disordered over two sets of sites with occupancies of 0.803 (6) and 0.197 (6). In the crystal, mol-ecules are connected by N-H⋯Cl, O-H⋯Cl C-H⋯O and C-H⋯Cl hydrogen bonds, forming chains propagating along [001]. There are also C-H⋯π inter-actions present in the crystal structure.

Opipramolium fumarate.

In the crystal structure of the title salt {systematic name: 4-[3-(5H-dibenz[b,f]azepin-5-yl)prop-yl]-1-(2-hy-droxy-eth-yl)piperazin-1-ium (2Z)-3-carb-oxy-prop-2-enoate}, C(23)H(30)N(3)O(+)·C(4)H(3)O(4) (-), the piperazine group in the opipramol cation is protonated at only one of the N atoms. In the cation, the dihedral angle between the two benzene rings is 53.5 (6)°. An extensive array of inter-molecular O-H⋯O, O-H⋯N and N-H⋯O hydrogen bonds and weak inter-molecular N-H⋯O, C-H⋯O and C-H⋯π inter-actions dominate the crystal packing.

Cyclo-benzaprinium salicylate.

In the title mol-ecular salt [systematic name: 3-(5H-di-benzo[a,d]cyclo-hepten-5-yl-idene)-N,N-dimethyl-1-propanaminium 2-hy-droxy-benzoate], C(20)H(22)N(+)·C(7)H(5)O(3) (-), the benzene rings of the cyclo-benzaprinium cation are inclined with a dihedral angle of 61.66 (7)°. An intra-molecular O-H⋯O hydrogen bond occurs within the salicylate anion, generating an S(6) ring. In the crystal, the cation and anion are linked by an N-H⋯O inter-action.

Opipramol.

IN THE TITLE COMPOUND (SYSTEMATIC NAME: 2-{4-[3-(5H-dibenz[b,f]azepin-5-yl)prop-yl]piperazin-1-yl}ethanol), C(23)H(29)N(3)O, the 5H-dibenz[b,f]azepine and piperazine rings adopt boat and chair conformations, respectively, and the overall shape of the fused ring part of the molecule is a butterfly. In the crystal, O-H⋯N and C-H⋯O hydrogen bonds link the mol-ecules into a layer parallel to the bc plane.

2-(4-Methyl-phen-yl)benzonitrile.

In the title compound, C(14)H(11)N, the dihedral angle between the mean planes of the two benzene rings is 44.6 (7)°. The crystal packing is stabilized by weak inter-molecular π-π stacking inter-actions, the centroid-centroid distances being 3.8172 (12) and 3.9349 (12) Å.

1-(5,5-Dioxido-10H-phenothia-zin-10-yl)ethanone.

In the title compound, C(14)H(11)NO(3)S, the six-membered thia-zine ring fused to two benzene rings adopts a distorted boat conformation. The dihedral angle between the mean planes of the two benzene rings is 45.8 (1)°. The crystal packing is stabilized by weak inter-molecular C-H⋯O inter-actions.