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In the title salt, (C 7 H 11 N 2 )[Cr(C 2 O 4 ) 2 (H 2 O) 2 ], the asymmetric unit contains one half-cation and one half-anion. The Cr atom, the C and N atoms involved in C— N(exocyclic) bonding and the N and H atoms of N—H groups lie on twofold rotation axis. The Cr III  atom of the complex anion is six-coordinated in a distorted (4 + 2) octa­hedral geometry with four equatorial O atoms of two nearly coplanar oxalate and two quasi-axial aqua O atoms. In the crystal, the protonated N atoms of the pyridine rings are hydrogen bonded to the carbonyl O atoms of the anions, forming chains along [010]. These chains are connected by lateral O—H⋯O hydrogen bonds, stabilizing the structure.

4-(Dimethylamino)pyridiniumtrans-diaquabis[oxalato(2−)-κ2O1,O2]chromate(III)

4-(Dimethylamino)pyridiniumtrans-diaquabis[oxalato(2−)-κ²O¹,O²]chromate(III)