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

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