Synthesis and crystal structure of hydrated μ-oxa­lato-bis­{bis­[3-methyl-5-(pyridin-2-yl)-1H-1,2,4-triazole]iron(II)} bis­(toluene­sulfonate) 2.75-hydrate

In the title compound [Fe₂(C₂O₄)(C₈H₈N₄)₄](CH₃C₆H₄SO₃)₂·2.75H₂O, the two Fe^II ions have a highly distorted octa­hedral FeN₄O₂ environment formed by two bidentate triazole-based chelating ligands and a bis-bidentate oxalate bridging anion that connects the metal ions. Stabilization within the crystal structure is provided via a system of O—H...O and N—H...O hydrogen bonding, which determines the formation of a two-dimensional architecture along the a-axis direction.