The last couple of decades, in coordination chemistry pyridazine has been extensively used as ligands [
1,
2,
3,
4]. Pyridazine-based and its substituted analogue compounds are explored due to their practical applications in various enzymes regulation processes and have applications in drug design [
5,
6,
7]. The electron-deficient aromatic systems containing two nitrogen atoms have reduced electron-donor abilities compared to that of pyridines [
6]. The two adjacent nitrogen donor atoms in the pyridazine heterocycle attract two metal centers in close proximity [
8,
9]. With one or two additional donor centers next to the ring nitrogen atoms of pyridazine at 3,6-position leads to tri- or tetra dentate ligands, which have been less explored [
10,
11,
12,
13,
14]. Symmetric dinuclear complexes of two redox active metal centers have been of interest with regard to the mixed-valence oxidation states [
15,
16]. For several decades, both experimental and theoretical chemists have been interested in the magnetic properties of dinuclear coordination complexes. A variety of compounds come into sight from the extensive study of different bridging ligands, such as pyrazolates, triazolates and pyrimidine- or pyridazine-linked aimed at fundamental magnetostructural study of iron (II) complexes [
17,
18,
19]. Transition metal chelates of tetra dentate N
2O
2 donor type ligands have been employed as chelating bidentate ligands showed interesting structurally equivalent iron (II) centers with intriguing magnetic properties [
20]. A large number of simple di- or poly-nuclear complexes are reported where the metal ions are superexchange coupled through different bridging moiety and most of them exhibit anti-ferromagnetic magneto-structural correlations [
7]. Moreover, hydrogen bonding, due to its directional and selective nature is a powerful organizing force in designing useful solid-state materials [
21,
22]. Construction of a series of supramolecular architecture depends on the choice of spacer (organic moiety) and linker (bridging ligands), and also on the coordination geometries of metal ions [
23]. In occurrence of the oxygen atoms in peripheral carboxylate groups, the oxygen atoms might act as potential coordination donors or hydrogen bond receptors. Moreover, to generate the metal-organic coordination networks or molecular building blocks through hydrogen-bonded supramolecular interactions, the metal-pyridazine moiety plays a very important role as a metallo- ligand [
24,
25].
Here, we report the preparation of a pyridazine-3, 6-dicarboxylate (
Scheme 1) based dinuclear complex of iron with extensive hydrogen boning, leads to an interesting supramolecular network formation, where two rigid dianionic pyridazinedicarboxylate (3,6 pzdc) ligands are organized in a coplanar side-by-side mode around two octahedral metal ions.