Two New Iron Coordination Polymers Based on Fe-pyta ChainsIncorporating Pyridine-2,4,6-tricarboxylate

Reaction of FeCl₂-6H₂O, pyridine-2,4,6-tricarboxylic acid(H₃pyta) and NaOH in the hydrothermal system at 185°C resulted in the formation of 1D coordination polymerFe(Hpyta)(H₂O)₂](1) based on Fe-Hpyta chains. When the abptabpt=4-amino-3,5-bis(4-pyridyl)-1,2,4-triazole] ligand was employed in the reaction system, a 3D supramolecular porous network (H₂bpt)Fe(pyta)(H₂O)₂]-4H₂O(2) was obtained. The framework was constructed with negative (Fe-pyta)⁻ chains and the positive H₂bpt^*in situ, formed from the abpt reagent, to form 1D channels filled with guest water molecules via hydrogen-bonds. X-Ray diffraction crystal structure analysis shows that complex 1 crystallized in the monoclinic system, space group C2/c, a=1.1490(5) nm, b=0.9008(4) nm, c=1.0058(5) nm, β=107.254(9)°, V=0.9942(8) nm³, Z=4; and complex 2 crystallizes in the triclinic system, space group with a=0.90392(11) nm, b=0.96027(11) nm, c=1.55540(18) nm, a=73.558(2)°, β= 86.126(2)°, γ= 68.745(2)°, v=1.2059(2) nm³ and Z=2.