Tetra-μ-acetato-κ⁸O:O′-bis­[(pyridine-2-carbo­nitrile-κN¹)copper(II)]

The title binuclear compound, [Cu₂(CH₃COO)₄(C₆H₄N₂)₂], lies about an inversion center, with the Cu^II cation bridged by four acetate anions and coordinated by a pyridine N atom in a distorted square-pyramidal geometry. The Cu...Cu distance is 2.5997 (15) Å. In the crystal, mol­ecules are linked by weak C—H...O and C—H...N hydrogen bonds into a three-dimensional supra­molecular architecture. The crystal studied was a non-merohedral twin with a minor twin component of 4.1 (1)%.

1-Ethyl-5-iodo­indoline-2,3-dione

There are two independent mol­ecules in the asymmetric unit of the title compound, C₁₀H₈INO₂, which differ in the degree of planarity. The iodo­indoline-2,3-dione skeleton of mol­ecule 1 is essentially planar [mean deviation = 0.003 (2) Å for the nine non-H atoms of the indoline core, with a maximum deviation of 0.033 (1) Å for the I atom]. The I atom and O atom in the 3-position of mol­ecule 2 deviate by 0.195 (1) and 0.120 (2) Å, respectively, from the least-squares plane through the nine non-H atoms of the indoline core. Mol­ecules 1 and 2 are roughly coplanar, the mean planes through their cores making a dihedral angle of 6.84 (1)°. This coplanarity results in a layer-like structure parallel to (6,11,17) in the crystal, the distance between adjacent least-squares planes through the cores of mol­ecules 1 and 2 being 3.37 (1) Å. In such a layer, mol­ecules 1 and 2 are linked by C—H...O hydrogen bonds, forming chains along [11-1]. The chains are further coupled to construct a kind of double-chain structure via I...O inter­actions [3.270 (2) Å].

N,N-Dimethyl-3-phenyl­isoxazole-5-carbox­amide

In the title compound, C₁₂H₁₂N₂O₂, synthesized by ammonolysis of 3-phenyl­isoxazole-5-carbonyl chloride in di­chloro­methane, the dihedral angle between the isoxazole ring and the phenyl ring is 14.05 (7)°. In the crystal, centrosym­metrically related mol­ecules are linked into dimers by pairs of C—H...O hydrogen bonds, generating rings of graph-set motif R₂²(10).