The reaction of colorless iron(II) formate or the mixed-valence cluster Fe3O(MeCOO)6(H2O)3 with formic acid in dimethylformamide exposed to air at 110 °C affords black crystals of the mixed-valence ...

Herein, a new group of visible light photocatalysts is described. Iron(III) oxides could be promising visible light photocatalysts because of their small band gap enabling visible light excitation.