(Tris{2-[(1-methyl­imidazol-2-yl)methyl­imino]ethyl}amine)iron(II) diperchlorate acetonitrile solvate

In the cation of the title complex, [Fe(C₂₁H₃₀N₁₀)](ClO₄)₂·CH₃CN, the Fe^II atom is coordinated by three imine N atoms and three imidazole N atoms in a distorted octa­hedral geometry, with Fe-N bond distances ranging from 2.189 (3) to 2.236 (3) Å.

cis-Diaqua­bis(1,10-phenanthroline)nickel(II) 5-sulfonatosalicylate tetra­hydrate

In the title complex, [Ni(C₁₂H₈N₂)₂(H₂O)₂](C₇H₄O₆S)·4H₂O, the cation inter­acts with the anion and uncoordinated water mol­ecules through hydrogen bonding with the coordinated water mol­ecules, giving rise to a hydrogen-bonded sheet architecture. In the cation, the Ni atom exists in an octa­hedral geometry with two cis-arranged water ligands.

Aqua­bis(1,10-phenanthroline)(3-sulfonatobenzoato)cadmium(II) tetra­hydrate

In the title mononuclear complex, [Cd(C₇H₄O₅S)(C₁₂H₈N₂)₂(H₂O)]·4H₂O, the Cd^II atom is coordinated in a capped trigonal–prismatic geometry by four N atoms and three O atoms. The 3-sulfonatobenzoate ligand chelates the Cd^II atom only via the carboxyl group. In the crystal structure, extensive O—H...O hydrogen bonds generate a three-dimensional network.