Exploring the structural diversities and magnetic properties of copper(ii) and manganese(ii) complexes based on 5-methoxyisophthalate and flexible bis(imidazole) ligands

Abstract

Six copper(II) and manganese(II) coordination polymers with 5-methoxyisophthalate (CH₃O-ip) and three related flexible N-donor ancillary ligands, {[Cu₃(CH₃O-ip)₂(bie)(OH)₂]}_n (1), {[Cu₂(CH₃O-ip)₂(bib)₂]·H₂O}_n (2), {[Cu(CH₃O-ip)(bbb)(H₂O)]·H₂O}_n (3), {[Mn₃(CH₃O-ip)₄(H₂O)₂]·(H₂-bie)·4H₂O}_n (4), {[Mn(CH₃O-ip)(bib)]}_n (5) and {[Mn(CH₃O-ip)(bbb)]}_n (6) [bie = 1,2-bis(imidazol-1′-yl)ethane; bib = 1,4-bis(imidazol-1-ylmethyl)benzene; bbb = 1,1′-(1,4-butanediyl)bis(benzimidazole)], have been synthesized under hydrothermal conditions. Complexes 1–6 were structurally characterized by elemental analysis, infrared (IR) spectra and X-ray single-crystal diffraction. Complex 1 exhibits a three-dimensional (3D) framework with a (3,4)-connected (5·8·9)(5·11²)(5·8³·11²) topology. Complex 2 shows a two-dimensional (2D) layered structure with a (3,5)-connected (4²·6)(4²·6⁷·8) topology and further stacks via hydrogen-bonding interactions to give a 3D supramolecular architecture. Complex 3 possesses a 1D chain and further stacks into a 2D supramolecular architecture via hydrogen-bonding interactions. Complex 4 is a 2D layered structure with a (4,4) topology and further stacks via hydrogen-bonding interactions to generate a 3D supramolecular architecture. Similar to 2, complex 5 displays a 2D layered structure with a (3,5)-connected (4²·6)(4²·6⁷·8) topology. Complex 6 features a 3D structure with a (3,5)-connected (4·6·8)(4·6⁴·8⁵) topology. Thermogravimetric properties and magnetic properties of 1–6 were also investigated.