Synthesis, structure and magnetic properties of a new one dimensional manganese coordination polymer constructed by a new asymmetrical ligand

• A novel coordination polymer of a pentadentate ligand has been synthesized.
• Crystal structure analysis revealed [MnL]n was a zigzag penta-coordinated chain.
• Magnetic properties has been studied.

A new pentadentate chelate-bridging ligand possessing an inner N2O3 coordination site with one amide, one imine, and two phenoxo functions, 2-hydroxy-N-(2-(((3-hydroxynaphthalen-2-yl)methylene)amino)ethyl)benzamide (H3L), was synthesised. Reaction it with Mn(OAc)2·4H2O yielded a novel zigzag penta-coordinated Mn(III) coordination polymer, [MnL]n, due to the bridging ability of the amide function. The crystal structure of [MnL]n has been determined at 293 K which crystallizes in the monoclinic space group P21/c (No. 14): a = 16.0601(12) Å, b = 8.4048(6) Å, c = 12.7168(10) Å, β = 112.395(9), V = 1606.0(2) Å3, Z = 4. The experimental magnetic susceptibilities indicates the Mn(III) coordination polymer exhibits dominant antiferromagnetic interactions between the manganese centers through the amido bridge, and spin canting is observed with a ferromagnetic transition occurring at 8.5 K.

A novel zigzag penta-coordinated Mn(III) coordination polymer [MnL]n has been synthesised and structurally characterized. The experimental magnetic susceptibilities indicates the Mn(III) coordination polymer exhibits the existence of a weak antiferromagnetic coupling along the chain through the amido bridge with a spin canting that leads to a long-range antiferromagnetic order at Tc ≈ 13 K and a canting leading to a weak ferromagnetic long-range order at Tc ≈ 7 K.Figure optionsDownload as PowerPoint slide