Experimental

R factor = 0.026; wR factor = 0.071; data-to-parameter ratio = 15.1. In the title molecular salt, (C3H12N2)[CrO4], each chromate anion accepts six N—H O and C—H O hydrogen bonds from nearby propane-1,2-diammonium cations. Three of the four O atoms of the chromate anion accept these bonds; the remaining Cr—O bond length is notably shorter than the others. In the crystal, the anions and cations stack in layers lying parallel to (100): the hydrogen-bonding pattern leads to a three-dimensional network. Related literature For background to organic chromates, see: Chebbi & Driss (2002, 2004); Srinivasan et al. (2003). For the crystal structures of simple salts of the propane-1,2-diammonium cation, see: Pospieszna-Markiewicz et al. (2011); Gerrard & Weller (2002)