Syntheses and crystal structures of three Mn(II) complexes with 2-hydroxynicotinate

Three new Mn(II) complexes, including a mononuclear complex with a 3D hydrogen-bonded structure, a 2D network with the (6,3) topology, and a 3D network with distorted α-Po topology, have been synthesized from 2-hydroxynicotinic acid, which adopt different coordination modes in these complexes.