(Acetato-κ²O,O′)(di-2-pyridyl­amine-κN)(tri­fluoro­acetato-κO)copper(II)

The title complex, [Cu(C₂F₃O₂)(C₂H₃O₂)(C₁₀H₉N₃)], has been prepared. The Cu^II cation has a slightly distorted square-pyramidal environment, with a basal plane formed by two N atoms of the di-2-pyridyl­amine ligand and two O atoms of the acetate group. The apical position is occupied by an O atom of the tri­fluoro­acetate group. Two mol­ecules related by a crystallographic center of symmetry are linked into a dimer by hydrogen bonds and further hydrogen bonds link the dimers into sheets.

Bis(3-tert-butyl-N,5-di­methyl­salicyl­aldiminato)­cobalt(II)

The title compound, [Co(C₁₃H₁₈NO)₂], was synthesized by the disproportionation of methyl-tetrakis­(tri­methyl­phosphine)­cobalt with 3-tert-butyl-N,5-di­methyl­salicyl­ald­imine in diethyl ether. The cobalt center in the structure is in a distorted tetrahedral geometry.

4-Phenyl-1-(1H-1,2,4-triazol-3-yl­carbonyl)­thio­semicarbazide

The title compound, C₁₀H₁₀N₆OS, was synthesized by the reaction of 1H-1,2,4-triazol-3-yl­hydrazine with phenyl isocyanate in benzene. The mol­ecule is non-planar, the dihedral angle between the two aromatic rings being 62.07 (7)°. N—H...O, N—H...N and N—H...S hydrogen bonds are observed.

Bis­[4-phenyl-5-(1H-1,2,4-triazol-3-yl)-4H-1,2,4-triazol-3-yl] di­sulfide

The title compound, C₂₀H₁₄N₁₂S₂, was synthesized by the reaction of 3-hydrazino-1H-1,2,4-triazole with phenyl isocyanate in benzene and by ring closure in an alkaline medium. Intermolecular N—H...N hydrogen bonds are observed and these form a five-membered ring.

N′-Benzoyl-4H-1,2,4-triazole-3-carbohydrazide

In the crystal structure of the title compound, C₁₀H₉N₅O₂, inter­molecular N—H...N [H...N = 2.13 (2) Å] and N—H...O [H...O = 2.016 (18) and 2.05 (2) Å] hydrogen bonds link mol­ecules into a two-dimensional framework.

4-{[(1E)-(3,5-Dibromo-2-hydroxy­phen­yl)methyl­ene]­amino}-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one

The crystal structure of the title compound, C₁₈H₁₅Br₂N₃O₂, shows a strong intra­molecular O—H...N hydrogen bond [N...O = 2.609 (4) Å, O—H = 0.90 Å, H...N = 1.80 Å and O—H...N = 148°], which leads to the existence of a phenol–imine tautomer.