The crystal structures of iron and cobalt pyridine (py)–sulfates, [Fe(SO4)(py)4]n and [Co3(SO4)3(py)11]n

Abstract

The solid-state structures of two metal–pyridine–sulfate compounds, namely catena-poly[[tetrakis(pyridine-κN)iron(II)]-μ-sulfato-κ2O:O′], [Fe(SO4)(C5H5N)4]n, (1), and catena-poly[[tetrakis(pyridine-κN)cobalt(II)]-μ-sulfato-κ2O:O′-[tetrakis(pyridine-κN)cobalt(II)]-μ-sulfato-κ3O,O′:O′′-[tris(pyridine-κN)cobalt(II)]-μ-sulfato-κ2O:O′], [Co3(SO4)3(C5H5N)11]n, (2), are reported. The iron compound (1) displays a polymeric structure, with infinite chains of FeII atoms adopting octahedral N4O2 coordination environments that involve four pyridine ligands and two bridging sulfate ligands. The cobalt compound (2) displays a polymeric structure, with infinite chains of CoII atoms. Two of the three Co centers have an octahedral N4O2 coordination environment that involves four pyridine ligands and two bridging sulfate ligands. The third Co center has an octahedral N3O3 coordination environment that involves three pyridine ligands, and two bridging sulfate ligands with one sulfate chelating the cobalt atom.

Keywords

• crystal structure
• pyridine
• sulfate
• transition metals
• crystal field theory
• coordination chemistry