The crystal structures of iron and cobalt pyridine (py)-sulfates, [Fe(SO 4 )(py) 4 ] n and [Co 3 (SO 4 ) 3 (py) 11 ] n

The solid-state structures of two metal-pyridine-sulfate compounds, namely -poly[[tetra-kis-(pyridine-κ )iron(II)]-μ-sulfato-κ : '], [Fe(SO )(C H N) ] , ( ), and -poly[[tetra-kis-(pyridine-κ )cobalt(II)]-μ-sulfato-κ : '-[tetra-kis-(pyridine-κ )cobalt(II)]-μ-sulfato-κ , ': ''-[tris-(pyridine-κ )cobalt(II)]-μ-sulfato-κ : '], [Co (SO ) (C H N) ] , ( ), are reported. The iron compound ( ) displays a polymeric structure, with infinite chains of Fe atoms adopting octa-hedral N O coordination environments that involve four pyridine ligands and two bridging sulfate ligands. The cobalt compound ( ) displays a polymeric structure, with infinite chains of Co atoms. Two of the three Co centers have an octa-hedral N O coordination environment that involves four pyridine ligands and two bridging sulfate ligands. The third Co center has an octa-hedral N O coordination environment that involves three pyridine ligands, and two bridging sulfate ligands with one sulfate chelating the cobalt atom.