Synthesis, structure and magnetic behavior of a new three-dimensional Manganese phosphite-oxalate: [C 2N 2H 10][Mn 2II(OH 2) 2(HPO 3) 2(C 2O 4)]

A novel manganese phosphite-oxalate, [C ₂N ₂H ₁₀][Mn ₂^II(OH ₂) ₂(HPO ₃) ₂(C ₂O ₄)] has been hydothermally synthesized and its structure determined by single-crystal X-ray diffraction. The structure consists of neutral manganese phosphite layers, [Mn(HPO ₃)] _∞, formed by MnO ₆ octahedra and HPO ₃ units, cross-linked by the oxalate moieties. The organic cations occupy the middle of the 8-membered one-dimensional channels. Magnetic studies indicate weak antiferromagnetic interactions between the Mn ²⁺ ions.