Crystal structure of ammonium/potassium trans-bis­(N-methyl­iminodi­acetato-κ(3) O,N,O′)chromate(III) from synchrotron data

The structure of the title compound, [(NH(4))(0.8)K(0.2)][Cr(C(5)H(7)NO(4))(2)] (C(5)H(7)NO(4) is methyl­iminodi­acetate; mida), has been determined from synchrotron data. The Cr(III) atom is located on a centre of symmetry and is coordinated by two N atoms and four O atoms of two facially arranged tridentate mida ligands, displaying a slightly distorted octa­hedral coordination environment. The Cr—N and mean Cr—O bond lengths are 2.0792 (14) and 1.958 (14) Å, respectively. The cation site is located on a twofold rotation axis and shows occupational disorder, being occupied by ammonium and potassium cations in a 0.8:0.2 ratio. In the crystal, inter­molecular hydrogen bonds involving the N—H groups of the ammonium cation as donor and the two non-coordinating O atoms of the carboxyl­ate group as acceptor groups consolidate the three-dimensional packing.