To the best of our knowledge, there are only a few reported structures of rhodizonate salts in which the anion might carry a charge of -3. The crystal structures of MnRbC6O6 and MnCsC6O6 both feature face-to face stacking of distorted (nonplanar) anions, where in the latter structure the closest carbon atoms of adjacent anions are only 2.69Å apart. The reported MOFs FeC6O6, and Cu3(C6O6)2 similarly contains dimers of distorted anions only 2.847 Å and 2.75 Å apart, respectively. An important distinction from our predictions of K3C6O6 is that these experimental structures do not feature equidistant stacking of anions. These experimental structures furthermore all contain some amount of water, and they are all based on transition metal cations that appear to induce magnetic interactions (we will discuss magnetism in a later section).