Two centrosymmetric dinuclear phenanthroline–copper(II) complexes with 3,5-dichloro-2-hydroxybenzoic acid and 5-chloro-2-hydroxybenzoic acid

Abstract

The title compounds, bis(μ-3,5-dichloro-2-oxidobenzoato)-κ3O1,O2:O2;κ3O2:O1,O2-bis[(3,5-dichloro-2-hydroxybenzoic acid-κO1)(1,10-phenanthroline-κ2N,N′)copper(II)], [Cu2(C7H2Cl2O3)2(C7H4Cl2O3)2(C12H8N2)2], (I), and bis(μ-5-chloro-2-oxidobenzoato)-κ3O1,O2:O1;κ3O1:O1,O2-bis[(5-chloro-2-hydroxybenzoic acid-κO1)(1,10-phenanthroline-κ2N,N′)copper(II)] ethanol monosolvate, [Cu2(C7H3ClO3)2(C7H5ClO3)2(C12H8N2)2]·C2H6O, (II), contain centrosymmetric dinuclear complex molecules in which Cu2+cations are surrounded by a chelating 1,10-phenanthroline ligand, a chelating 3,5-dichloro-2-oxidobenzoate or 5-chloro-2-oxidobenzoate anionic ligand and a monodentate 3,5-dichloro-2-hydroxybenzoic acid or 5-chloro-2-hydroxybenzoic acid ligand. The chelating benzoate ligand also bridges to the other Cu2+ion in the molecule, but the O atom involved in the bridge is different in the two complexes, being the phenolate O atom in (I) and a carboxylate O atom in (II). The bridge completes a 4+1+1 axially elongated tetragonal–bipyramidal arrangement about each Cu2+cation. The complex molecules of both compounds are linked into one-dimensional supramolecular chains through O—H...O hydrogen bonds.