Spin canting and metamagnetism in 3D pillared-layer homospin cobalt(II) molecular magnetic materials constructed via a mixed ligands approach

Two new 3D pillared-layer cobalt(II) molecular magnetic materials, formulated as {[Co-2(TDA)(TZ)( H2O) 2]H2O} n (1) and {[Co-3(TDA)(2)(bpy)(3)]6.75H(2)O} n (2) (H3TDA = 1H-1,2,3-triazole-4,5-dicarboxylic acid, HTZ = 1H-1,2,4-triazole and bpy = 4,4'-bipyridine), have been successfully assembled with H(3)TDA and auxiliary ligands, respectively. In 1, the neighboring Co(II) ions are connected via TDA(3-) to generate 2D layers, which are further bridged by TZ-to build a 3D 8-connected bcu net with a Schlafli symbol of (4(24)6(4)), whereas in 2, the nearest Co(II) ions are connected via TDA(3-) to form a hexagonal [Co-6(TDA)(6)](6-) macrocycle composed of 24-membered atoms, which can be further linked to each other to generate 2D Kagom layers. The Kagome layers are connected by bpy pillars to display a 3D (3,4,4,4)-connected KAVGAQ net with a Schlafli symbol of {6(3)} 2{6(4)10(2)}{6(4)8(2)}(2). Magnetic studies reveal that both of them show the spin canting and metamagnetic behaviors with critical temperatures of 3.5 K and 4 K, respectively.