Synthesis and Characterization of a 3D Coordination Polymer Based on Trinuclear Triangular Cu^II as Secondary Building Units

The hydrothermal reaction of CuII salts with 1,2,4-triazole (Htrz) in aqueous ammonia yielded a novel metal−organic framework {[Cu3(μ3-O)(μ3-trz)3(OH)(H2O)6]}n (1), which was characterized by single-crystal X-ray diffraction, X-ray powder diffraction, thermogravimetric analysis, IR, and variable-temperature magnetic susceptibility. It crystallizes in cubic, space group Fd3̄c with a = 24.644(3) Å, V = 14967(3) Å3, and Z = 96. Its framework is the first 3D structure using coordinative interactions constructed via trinuclear triangular CuII secondary building units, in which both CuII ions and trz ligands act as three-connected nodes to form a 6.82 net. An overall antiferromagnetic behavior was found in the compound.