Two new polymeric, one and two-dimensional compounds [Fe(dmbpy)(μ1,5-dca)2] (1) and [Fe(4,4'-bpy)(μ1,5-dca)2].0.24(4,4'-bpy).0.5(EtOH) (2), in which dmbpy=5,5'-dimethylbipyridine, dca = dicyanamide and 4,4'-bpy = 4,4'-bipyridine, has been synthesized under solvothermal conditions and fully characterized by elemental analysis, FT-IR spectroscopy and X-ray single crystal diffraction. Compound 1, with a rare coordination environment, is the only well-known example in which end-to-end double bridged dca ligands and a bidentate bulky aromatic ligand (dmbpy) are coordinated simultaneously to the iron center. Structural analysis of compound 2 showed it is a novel two-dimensional coordination polymer, constructed from repetition of 4,4'-bpy and dca as a bidentate bridging ligand. Changing the co-ligand to 4,4'-bpy, lead to completely different structure geometry and network, which confirms the substantial effect of co-ligand. Furthermore, Hirshfeld surfaces analyses have been performed to help understand the packing.

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