3,5-Lutidine penta-aqua sulfate complexes of first-row transition metals: [ M(3,5-lutidine)(H₂O)₅]SO₄, with M = Mn, Co, Ni, and Zn

The reactions of MnSO₄·H₂O, CoSO₄·7H₂O, NiSO₄·6H₂O and ZnSO₄·7H₂O with 3,5-lutidine (3,5-di-methyl-pyridine) yield crystals of penta-aqua-(3,5-di-methyl-pyridine-κN)manganese(II) sulfate, [Mn(C₇H₉N)(H₂O)₅]SO₄, (1), penta-aqua-(3,5-di-methyl-pyridine-κN)cobalt(II) sulfate, [Co(C₇H₉N)(H₂O)₅]SO₄, (2), penta-aqua-(3,5-di-methyl-pyridine-κN)nickel(II) sulfate, [Ni(C₇H₉N)(H₂O)₅]SO₄, (3), and penta-aqua-(3,5-di-methyl-pyridine-κN)zinc(II) sulfate, [Zn(C₇H₉N)(H₂O)₅]SO₄, (4), which were characterized by single-crystal X-ray diffraction. The four crystals are isostructural, demonstrating near identical unit-cell parameters and atomic positions. The metal atoms are all octa-hedrally coordinated, with one lutidine ligand and five water ligands. The sulfate dianion hydrogen bonds with the coordinated water mol-ecules of the dicationic metal complex salts, generating infinite three-dimensional networks.