A New Pillared-layer Framework with Rare Mn（II）-triazole-carboxylate Magnetic Layer Exhibiting an Antiferromagnetic Ordering

摘要

A novel pillared-layer framework with a (52.6)(53.63.73.8) Schlaifli symbol, [Mn(H2O)(Htrc)(Hbtc)]n (1), was prepared by the reaction of 1,2,4-triazole (Htrz), 1,3,5-benzene- tricarboxylic acid (H3btc), and MnII salt and structurally and magnetically characterized. It crystallizes in the orthorhombic system, space group P212121 with a = 7.1618(5), b = 9.0356(6), c = 10.9740(13) A, V = 1292.54(15) A3, Dc = 1.799 g/cm3, Mr = 350.15, Z = 4, F(000) = 708, p = 1.064 mm-1, and the final R = 0.0177 and wR = 0.0462 for 2273 observed reflections with I〉 2σ(I). The unique octahedral Mnn ion in 1 is periodically linked into a two-dimensional (2D) magnetic layer by p2-N1, N4-Htrz and syn, anti-COO of doubly deprotonated Hbtc2- anion, which is further supported by the phenyl backbone of Hbtc2- ligand to generate a 3D pillared-layer framework. Magnetically, complex 1 displays an antiferromagnetic ordering below 5.0 K due to the cooperative antiferromagnetic couplings mediated by the mixed heterobridges within the magnetic layer.