A new family of 3d–4f heterometallic coordination polymers assembled with 1H-1,2,3-triazole-4,5-dicarboxylic acid: syntheses, structures and magnetic properties

Abstract

Five isostructural copper(II)–lanthanide(III) heterometallic coordination polymers (CPs), {[Cu₂Ln(TDA)₂Cl(H₂O)₄]·2H₂O}_n [Ln = Gd (Cu–Gd), Tb (Cu–Tb), Dy (Cu–Dy), Ho (Cu–Ho) and Er (Cu–Er)] (H₃TDA = 1H-1,2,3-triazole-4,5-dicarboxylic acid), have been synthesized under solvothermal conditions and structurally characterized in detail. In these CPs, two neighboring Cu(II) ions are connected via one μ₂-Cl to form [Cu₂Cl]³⁺ units, which are further linked into a copper chain through bridging TDA³⁻. The neighboring copper chains are further connected by lanthanide to form a two-dimensional structure with sql topology. The magnetic properties of the five isostructural heterometallic CPs have been studied as well.