A Unique 2D Layered FeⅢ Coordination Polymer with only Formate Ligand as Bridges: Synthesis, Crystal Structure and Magnetic Properties

A novel two-dimensional layered Feformate, Fe(HCO)ClHO, has been synthesized by solvothermal reaction. The structure of complex is characterized by single-crystal X-ray diffraction. The complex crystallizes in tetragonal space group P4/nmm with a = 5.9588(6), c = 8.3831(17) ?, V = 297.66(7) ?~3, Z = 2, F(000) = 198, Dc = 2.224 g/cm~3, Mr = 199.35, μ = 2.927 mm, the final R = 0.0231 and w R = 0.0585(I > 2σ(I)) for all data. Single-crystal structure analysis indicates that the complex has a 2D metal formate structure with only formate anions as bridges. The anti-anti formats link the FeⅢ ions to form a(4, 4) net, while the chlorine ions and water molecules coordinate to Feon both sides of the layer. Magnetic study have shown that an antiferromagnetic interactions between the FeⅢ ions in the complex. And a field induced spin-flop was detected at low temperature.