Effect of the counterion and guest molecules on the crystal structures of the coordination compounds with the Cu2(HL)22+ cation (H2L = 4,4’-[2-(3-hydroxyiminobutyl)imino]biphenyl): Syntheses, structures, and magnetic properties

Abstract

The molecular and crystal structures of complexes [Cu₂(HL)₂(CH₃OH)₂](BF₄)₂ ∙ C₆H₃Cl₃ (I), [Cu₂(HL)₂(H₂O)₂](1,4-O₂CС₆Н₄CO₂) (II), and [Cu₂(HL)₂(H₂O)₂](4,4’-O₂CС₆Н₄С₆Н₄CO₂) (^III) (H₂L is 4,4’-[2-(3-hydroxyiminobutyl)imino]biphenyl, C₆H₃Cl₃ is 1,2,4-trichlorobenzene) are determined by X-ray diffraction analyses. The crystalline lattices of complexes I and II contain discrete binuclear cations Cu₂(HL)₂²⁺, whereas the crystalline lattice of compound III contains both discrete cations Cu₂(HL)₂²⁺ and polymer chains [Cu₂(HL)₂²⁺]n. In compounds I–III, the crystalline lattice units are joined by hydrogen bonds. The analysis of the temperature dependence of the magnetic susceptibility shows that the magnetic properties of compound III are determined only by antiferromagnetic interactions of the Cu²⁺ ions within the cations Cu₂(HL)₂²⁺