Manganese(III) formate: A three-dimensional framework that traps carbon dioxide molecules

Carbondioxide, formic acid, and watermolecules 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.