Iron(II) djenkolate: synthesis and properties

Djenkolate complex of iron, [Fe(C7H12N2O4S2)]·H2O, has been synthesized by the reaction of potassium djenkolate with Fe (SO4)·7H2O under nitrogen atmosphere. X-Ray diffraction pattern has been indexed in orthorhombic system with lattice parameters: a=11.24 ?, b=7.50 ? and c=6.96 ?. According to IR spectroscopy, coordination is performed through COOand NH2 groups. An octahedral geometry for Fe ion is suggested by UV-Vis and M?ssbauer spectroscopies. Thermal decomposition leads to the formation of Fe2O3 (hematite). The compound shows poor solubility in water and in common organic solvents.