SOLVOTHERMAL SYNTHESIS AND CRYSTAL STRUCTURE OF THE MANGANESE(II) COORDINATION POLYMER [Mn2(Br2BDC)2(DMF)3]n MORPHOLOGY

Coordination polymers and metal-organic frameworks form when metal ions combine with organic bridging ligands to give infinite one-, two- or three-dimensional crystalline structures. The scientific importance of this field was recognized in 2025 by the award of the Nobel Prize in Chemistry to S. Kitagawa, R. Robson and O. M. Yaghi [1]. In recent years, coordination polymers of Ni(II), Cu(II), Cd(II) and other metals based on carboxylate ligands have been synthesized, and their crystal structures and functional properties have been studied in detail [2], [3]. Manganese(II)-based systems are of particular interest because the high-spin d5 configuration allows the coordination sphere to adopt a variety of geometries. A two-dimensional Mn(II) coordination polymer with 2,5-dibromoterephthalate was obtained by the solvothermal method, and its dielectric properties and surface area were characterized [4]; for a Cd(II) polymer based on isonicotinate, structural and textural data were analyzed together [5]. Nevertheless, the synthesis and crystal structure of compounds in the Mn(II)-2,5-dibromoterephthalate-DMF system remain insufficiently studied. The aim of this work is to synthesize a new coordination polymer of composition [Mn2(Br2BDC)2(DMF)3]n (Br2BDC2− = 2,5-dibromoterephthalate, DMF = N,N-dimethylformamide) by the solvothermal method and to determine its crystal structure.