Two 3-D metal organic frameworks containing 2,2′-bipyridine-5,5′-dicarboxylic acid: synthesis, structure, and magnetic properties

Two metal organic frameworks, {[M(H₂BPDC)(SO₄)]}_n (M = Mn (1), Zn (2)); BPDC = 2,2′-bipyridine-5,5′-dicarboxylic anion), have been synthesized under hydrothermal conditions. The structure analyses of 1 and 2 reveal that the two compounds have similar 3-D structures. Compound 1 crystallizes in the orthorhombic system with space group Pnma, while 2 displays a monoclinic system with space group P21/n. Magnetic investigation suggests that weak antiferromagnetic coupling exists between adjacent Mn²⁺ ions in 1.