Makon Ma Houga N1, Capet F2, Nenwa J1, Bebga G3, Foulon M4.
Acta Crystallogr E Crystallogr Commun. 2015 Oct 31;71(Pt 11):1408-10. doi: 10.1107/S2056989015020113. eCollection 2015.In the title hybrid salt, (C7H11N2)3[Cr(C2O4)3]·4H2O, the central Cr(III) ion of the complex anion (point group symmetry 2) is coordinated by six O atoms from three chelating oxalate(2-) ligands in a slightly distorted octa-hedral coordination sphere. The Cr-O bond lengths vary from 1.9577 (11) to 1.9804 (11) Å, while the chelate O-Cr-O angles range from 82.11 (6) to 93.41 (5)°. The 4-(di-methyl-amino)-pyridinium cations (one situated in a general position and one on a twofold rotation axis) are protonated at the pyridine N atoms. Read More