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.
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Cornia et al. (1999) studied this question.