Iron(II) hydrazinium sulfate

The title compound, poly[[dihydraziniumiron(II)]-di-mu-sulfato- kappa(4) O:O'], [Fe(SO4)(2)(N2H5)(2)](n), contains fairly regular trans-FeN2O4 octahedra. The Fe atoms (site symmetry (1) over bar) are bridged by pairs of sulfate groups into infinite [ 100] chains, which are cross-linked by a network of N-H center dot center dot center dot O hydrogen bonds. Fe(N2H5)(2)(SO4)(2) is isostructural with its zinc, chromium(II) and cadmium-containing analogues.