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The title compound, (C 5 H 6 N)[Cr(C 2 O 4 ) 2 (H 2 O) 2 ], contains one protonated pyridine mol­ecule and one [Cr(C 2 O 4 ) 2 (H 2 O) 2 ] −  complex anion in the asymmetric unit. The Cr III  in the complex anion is coordinated in a distorted octa­hedral environment by two O atoms from two  cis  water mol­ecules and four O atoms from two chelating oxalate dianions. The crystal packing is stabilized by inter­molecular N—H⋯O(oxalate) and O—H⋯O(oxalate) hydrogen bonds and by π–π stacking inter­actions (centroid–centroid distance = 3.602 Å) between pyridine rings, thereby building up a three-dimensional network.

Pyridiniumcis-diaquabis(oxalato-κ2O,O′)chromate(III)

Pyridiniumcis-diaquabis(oxalato-κ²O,O′)chromate(III)