Manganese(III) Formate: A Three-Dimensional Framework That Traps Carbon Dioxide Molecules

Carbon dioxide, formic acid, and water molecules are trapped in the crystal lattice of manganese(III ) formate (see 1 ), which was obtained by reducing permanganate with formic acid. Each CO₂ guest molecule exhibits four C−H⋅⋅⋅O−C−O interactions with the three-dimensional host framework of Mn(HCOO)₃ units. Compound 1 undergoes an antiferromagnetic phase transition at 27 K.