Synthesis,Characterization and Magnetic Properties of a New Manganese(Ⅱ) Phosphite

A new manganese(II) phosphite,Mn 2 F2(HPO3)(1),was synthesized with tetraethylene pentamine as structure directing agent under hydrothermal conditions.The as-synthesized product was characterized by single crystal X-ray diffraction,powder X-ray diffraction,infrared(IR),UV-Vis spectrum,thermogravimetric analysis(TGA),inductive coupled plasma-atomic emission spectroscopy(ICP-AES),elemental analyses and magnetic susceptibility measurement.Single crystal X-ray diffraction analysis reveals that compound 1 crystallized in the orthorhombic space group Pnma,with a=0.75667(15) nm,b=1.0247(2) nm,c=0.55432(11) nm,V=0.42980(15) nm 3,Z=4.The 3D compact framework of compound 1 was built up by the Mn2O6F4 dimers and HPO3 pseudo-pyramids.Compound 1,a new metal-rich manganese phosphite,shows a high thermal stability limit of 550 ℃.Magnetic measurement indicates that compound 1 exhibits the global antiferromagnetic interactions with a ferromagnetic transition at 28 K.