Raúl Colorado-Peralta

Bis(μ2-benzoato-κ2O:O′)bis­[(benzoato-κ2O,O′)bis(4,4′-bi­pyridine-κN)cobalt(II)]–benzoic acid (1/6)

In the title compound, [Co2(C7H5O2)4(C10H8N2)4]·6C6H5COOH, the centrosymmetric cobalt dimer co-crystallizes with six molecules of benzoic acid. Each CoII atom is coordinated by four O atoms in a distorted square-planar arrangement while the N atoms are located in apical positions. The dihedral angles between the rings comprising each of the 4,4′-bipyridyl ligands are 25.2 (2) and 22.8 (2)°. In the crystal, the three-dimensional network is assembled by O—H⋯O and C—H⋯O hydrogen bonds.

Synthesis, characterization and X-ray studies of new six–seven membered rings [4.5.0] heterobicyclic system of monomeric boronates

Abstract Different tridentate ligands derived from ethanolamines and 2-hydroxyacetophenone, 2-hydroxybenzophenone and salicylaldehyde were reacted with two equivalents of phenylboronic acid to obtain compounds 6a–6f which are [4.5.0] heterobicyclic systems with a B−O−B structural unit. The boronates were fully characterized and two heterobicyclic [4.5.0] structures have been analyzed by X-ray crystallography, where a series of parameters such as bond distances, bond angles, torsion angles, tetrahedral character at the boron atom and deviation of the boron atom from the mean plane have been evaluated.

Crystal structure of catena-poly[[[tri­aqua­(4-cyano­benzoato-κO)nickel(II)]-μ-4,4′-bi­pyridine-κ2N:N′] 4-cyano­benzoate]

In the title polymeric complex salt, {[Ni(C8H4NO2)(C10H8N2)(H2O)3](C8H4NO2)}n, the NiII cation is coordinated by a 4-cyanobenzoate anion, two 4,4′-bipyridine ligands and three water molecules in a distorted N2O4 octahedral geometry. The 4,4′-bipyridine ligands bridge the NiII cations to form polymeric chains of the title complex cations, propagating along the c-axis direction. The dihedral angle between the pyridine rings of the 4,4′-bipyridine ligand is 24.9 (6)°. In the crystal, the uncoordinating 4-cyanobenzoate anions link with the complex cations via O—H⋯O hydrogen bonds into a three-dimensional supramolecular architecture. Weak C—H⋯O, C—H⋯N interactions and π–π stacking [centroid-to-centroid distances = 3.566 (4) and 3.885 (4) Å] are also observed in the crystal.