119 research outputs found
Hirshfeld surface analysis and quantum chemical study of molecular structure of phosphate
ABSTRACT. In this present study, Density fuctional theoretical computations are performed at (B3LYP, PBEPBE), HF and MP2 level with 3-21G basis sets to derive optimized geometry and bonding features. The calculated geometrical parameters have been compared with experimental data. The intermolecular O–H…O and N–H…O hydrogen bonds are involved in crystal structure stabilization. An intramolecular O–H…N hydrogen bond is observed between the phosphate OH group and the N atom. Further, the molecular Hirshfeld surface analysis was carried out to reveal the nature of intermolecular contacts and the fingerprint plot provides the information about the percentage contribution and reveals that the O…H (44.1%) interactions have the major contribution to form the crystal. The Mulliken population analysis and the HOMO-LUMO energy gaps show that the molecule has a good stability and from the calculation, we conclude that the molecule is really hard materials.
KEY WORDS: Energy gaps, Hydrogen bonds, Hirshfeld surface, Mulliken population, Phosphate
Bull. Chem. Soc. Ethiop. 2021, 35(3), 625-638.
DOI: https://dx.doi.org/10.4314/bcse.v35i3.1
(Diaminomethylidene)sulfonium chloride–thiourea (3/2)
The asymetric unit of the title salt, 3CH5N2S+·3Cl−·2CH4N2S, contains two molecules of thiourea, three (diaminomethylidene)sulfonium cations and three chloride anions. The crystal packing is stabilized by N—H⋯Cl, N—H⋯S, S—H⋯Cl and S—H⋯S hydrogen bonds, forming a three-dimensional network
5-(Pyridin-4-ylmethyl)-1H-pyrazolo[3,4-d]pyrimidin-4(5H)-one
In the title compound, C11H9N5O, the pyrazolopyrimidin-4-one ring system is almost planar, with a maximum deviation of 0.0546 (13) Å for the O atom. The crystal packing is stabilized by intermolecular N—H⋯N, C—H⋯O and C—H⋯N hydrogen bonds. In addition, π–π stacking is found between the pyridine ring and the pyrazolopyrimidin-4-one ring systems, with centroid–centroid distances in the range 3.9627 (12)–4.6781 (12) Å
Diethyl 2-{(dibenzylamino)[4-(trifluoromethyl)phenyl]methyl}malonate
The asymmetric unit of the title compound, C29H30F3NO4, contains two independent molecules. In each independent molecule, one of two terminal ethyl groups is disordered over two conformations: the occupancies of major components were fixed at 0.53 and 0.64 in the two molecules. In the crystal structure, weak intermolecular C—H⋯O hydrogen bonds link molecules into chains propagating along [10]
4-tert-Butyl-4′-(4-methoxyphenyl)-3′-(4-methylphenyl)-1,2,3,4-tetrahydrospiro[naphthalene-2,5′(4′H)-1,2-oxazol]-1-one
In the title compound, C30H31NO3, the tolyl ring is almost coplanar with the isoxazole ring [dihedral angle = 12.51 (7)°], whereas the methoxyphenyl ring is almost perpendicular to the isoxazole ring [dihedral angle = 89.77 (5)°]. In the crystal, molecules are connected through C—H⋯O hydrogen bonds, forming chains running along the a axis
Ethyl 2-amino-4-phenyl-4H-1-benzothieno[3,2-b]pyran-3-carboxylate
The title heterocyclic compound, C20H17NO3S, was synthesized by condensation of ethyl cyanoacetate with (Z)-2-benzylidenebenzo[b]thiophen-3(2H)-one in the presence of a basic catalyst in ethanol. The phenyl and ester groups make dihedral angles of 77.67 (6) and 8.52 (6)°, respectively, with the benzothienopyran ring system [maximum r.m.s. deviation = 0.1177 (13) Å]. In the crystal, centrosymmetric dimers are formed through pairs of N—H⋯O hydrogen bonds between the amine and ester groups. Intermolecular C—H⋯N hydrogen bonds and C—H⋯π interactions involving the thiophene ring are also observed
6-Nitro-2,3-dihydro-1H-pyrrolo[2,1-c][1,4]benzodiazepine-5,11(10H,11aH)-dione
In the two molecules of the asymmetric unit of the title compound, C12H11N3O4, the seven-membered diazepine ring adopts a boat conformation (with the two phenylene C atoms representing the stern and the methine C atom the prow). The five-membered pyrrole ring, which has an envelope conformation, makes dihedral angles of 60.47 (10) and 54.69 (9)° with the benzene ring of the benzodiazepine unit in the two molecules. In the crystal, intermolecular N—H⋯O hydrogen bonds and π–π stacking interactions [centroid–centroid distance = 3.8023 (7)–3.8946 (7) Å] lead to the formation of a three-dimensional framework
1-(1-Decyl-2-oxoindolin-3-ylidene)thiosemicarbazide
In the title 1-alkylisatin 3-thiosemicarbazone, C19H28N4OS, the imine C=N bond has a Z configuration, whereas the N—N—C=S unit has an E conformation. In the crystal, molecules are connected by N—H⋯O hydrogen bonds, forming zigzag chains running along the b axis
1-Allyl-4-(1,3-benzothiazol-2-yl)-5-methyl-2-phenyl-1H-pyrazol-3(2H)-one
The title compound, C20H17N3OS, is a 1H-pyrazol-3(2H)-one having aromatic 4-(1,3-benzothiazol-2-yl)- and 2-phenyl substituents. The five-membered ring and fused ring system are planar, the r.m.s. deviations being 0.021 and 0.005 Å, respectively. The five-membered ring is aligned at 7.9 (2)° with respect to the fused-ring system. The allyl and phenyl parts of the molecule are both disordered over two positions in a 1:1 ratio. Weak intermolecular C—H⋯O hydrogen bonding is present in the crystal structure
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