Synthesis, Thermal Stability, and Magnetic Properties of a Manganese(II) Coordination Framework Containing Bistriazolate Ligands

By combining a bistriazole ligand, [1,2,3]triazolo[4,5-f]benzotriazole-4,8(2H,6H)-dione (H2C6N6O2), and Mn(II) cations in water, we prepared a Mn(II) coordination framework having an unexpected structure. As revealed by single-crystal X-ray analysis, the compound crystallizes in the monoclinic crystal system in the space group P2(1)/n and forms a 2D layered structure. The complex formula is [Mn-3(C6N6O2)(2)(OH)(2)(H2O)(4)], and the framework is formed by bistriazolate and hydroxido ligands, Mn(II) cations (with two different coordination environments), and coordinated water molecules. The thermal stability was studied by TGA and VT XRPD. The studies reveal that the material is stable up to 250 degrees C. Furthermore, magnetic measurements show that the Mn(II) coordination framework undergoes ferrimagnetic order below 6.5 K.