Rizvan K. Askerov

Copper(II) complex with 3-(2-hydroxy-3-sulfo-5-nitrophenylhydrazo)pentane-2,4-dione: Synthesis and structure

AbstractThe copper(II) complex with 3-(2-hydroxy-3-sulfo-5-nitrophenylhydrazo)pentane-2,4-dione (H3L) is studied, and its crystal structure is studied by X-ray diffraction analysis. The crystals of [Cu(H2O)2]2(μ-L)2[Cu(H2O)4] (I) are triclinic (space group P

Synthesis, structure, and reactions of (4-aryl-3-cyano-6-oxopiperidin-2-ylidene)malononitriles

\bar 1

rac-5-Acetyl-6-hy­droxy-3,6-dimethyl-4-phenyl-2H-4,5,6,7-tetra­hydro­indazol-1-ium chloride

) at 100 K, a = 7.085(3), b = 10.373(5), c = 12.265(6) Å, α = 0.842(5)°, β = 104.996(6)°, γ = 99.156(6)°, Z = 1). The C=O and NH groups of hydrazone and the OH and SO3H groups from the aromatic moiety of the molecule are involved in coordination with the copper(II) atom. In the centrosymmetric trinuclear molecule the central Cu(2) atom has the coordination number six, and the terminal Cu(1) atoms have the coordination number five. The thermal properties of complex I are studied. The complex formation of copper(II) with the H3L ligand in an aqueous solution at temperatures 298 ± 0.5, 308 ± 0.5, and 318 ± 0.5 K is studied by potentiometric titration. The standard thermodynamic functions of the complex formation are determined.

Copper(II) complex with thienyltrifluoroacetylacetone and dimethyl sulfoxide: Synthesis and crystal structure

According to an X-ray diffraction study, pyridine-2-selenenyl chloride (1) characterized by unusually high stability both in solutions and in the solid state adopts a dimeric structure formed by two secondary intermolecular Se···N interactions. However, it slowly transforms into zwitterionic T-shaped pyridinium-2-selenenyl dichloride (2) in a dichloromethane solution. Conformational features, electronic structures, and reactivities of 1 and 2 are discussed on the basis of experimental and theoretical (quantum chemical calculations) data.

rac-Ethyl 6-hy-droxy-6-methyl-3-oxo-4-phenyl-1,3,4,5,6,7-hexa-hydro-benzo[c][1,2]oxazole-5-carboxyl-ate.

The reaction of aromatic aldehydes with Meldrums acid and malononitrile dimer in the presence of triethylamine led to the formation of (4-aryl-3-cyano-6-oxo-1,4,5,6-tetrahydropyridin-2-yl)malononitrile triethylammonium salts, which were converted upon acidification to (4-aryl-3-cyano-6-oxopiperidin-2-ylidene)malononitriles. The reaction of these compounds with thioglycolic acid anilide was observed to produce derivatives of 1,6-naphthyridine or thieno[2,3-h][1,6]naphthyridine, depending on the conditions. Structures of (3-cyano-6-oxo-4-phenylpiperidin-2-ylidene)malononitrile and its triethylammonium salt were studied by X-ray structural analysis.

2,25-Dioxo-27,28-diphenyl-30-oxa-29-thia-3,10,17,24-tetra­aza­penta­cyclo­[24.2.1.112,15.04,9.018,23]triaconta-5,7,9(4),10,12,14,16,18,20,22,26,28-dodeca­ene chloro­form disolvate

The molecule of the title compound, C22H26O2, exhibits Ci molecular symmetry with a crystallographic inversion centre at the mid-point of the central C—C bond. A kink in the molecule is defined by the torsion angle of 66.7 (2)° about this central bond of the alkyl bridge.

Crystal structure of the copper(II) complex with acetylacetone and ethylenediamine obtained by template synthesis

The structure of the title compound, C17H21N2O2 +·Cl−, is of interest with respect to its biological activity. The title compound comprises an organic cation and a chloride anion in the asymmetric unit. The positive charge is localized in a pyrazole moiety forming a pyrazolium cation. The structure displays intermolecular O—H⋯Cl and N—H⋯Cl hydrogen bonding.

Crystal structure of the complex of copper(II) with 3-(2-hydroxy-3-sulfo-5-nitrophenylazo)-pentadione-2,4

AbstractA new copper(II) complex with thienyltrifluoroacetone (Tfa) and dimethyl sulfoxide (DMSO), Cu(Tfa)2DMSO, was synthesized, and its X-ray diffraction analysis was carried out. The crystals were triclinic: a = 9.4496(5), b = 10.5075(6), c = 11.9160(6) Å, α = 82.600(1)°, β = 84.116(1)°, γ = 77.904(1)°, V = 1143.8(1) Å3, space group P