The polydentate organic ligands often involve certain functional groups in coordination, because their chelation to a metal ion is thermodynamically more favorable than monodentate coordination. In literature were described crystal structures of some dihydrazones with butanedione and diphenylethane, including 2,3-butanedione bis(isonicotinoylhydrazone) (H2L) [1] and complex Pb(II) with H2L [2].   We have obtained monocrystals from the reaction of Fe(NO3)3·9H2O and H2L in methanol which have been characterized by X-ray single crystal diffraction measurements. Compound [Fe(H2L)(H2O)3](NO3)3.2H2O (1) crystallizes in the monoclinic space group P21/n with unit cell dimensions: a = 10.5818(5), b = 18.3057(8), c = 14.2840(11) Å, β = 97.698(6)º. The crystal structure of 1 is formed by mononuclear complex cations [Fe(H2L)(H2O)3]3+, inorganic anions NO3- and solvated water molecules in a ratio of 1 : 3 : 2. The coordination polyhedron of Fe(III) represents a distorted pentagonal bipyramid. In the complex cation Fe(III) metalic center binds two N and two O atoms of neutral ligand H2L and one O atom of water molecule that reside in the equatorial plane of the coordination pentahedron of metal, and two O atoms in axial positions of two coordinated water molecules (Fig. 1). The Fe–N distances in the equatorial plane of the coordination core are equal to 2.165(3) and 2.196(3) Å, and Fe–O distances are 2.057(2), 2.048(2) and 2.131(3) Å. The axial distances Fe–O are 2.041(2) and 2.052(2) Å. The H2L ligand is tetracoordinated and binds to metal via O2N2 set of donor atoms. In the result the equatorial plane of bipyramid is formed by three fused five-membered chelate rings: two OCNNFe and one NCCNFe.   Multiple N-H...O, O(W)-H...O and O(W)-H...O(W) hydrogen bonds link the cations, anions and crystallized water molecules as donor, as well as acceptor into a H-bonded network. Note that H atoms are located at the terminal N(1) and N(6) atoms and the complex cations and anions are united in the crystal through N(1)-H..O(6), N(1)-H...O(7), N(6)-H...O(3) and N(6)-H...O(5) (donor...acceptor are in the range 2.777(5) – 3.033(5) Å) intermolecular hydrogen bonds.