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The title complex, [(CH 3 ) 2 NH 2 ][Cr(C 6 H 10 NO 4 ) 2 Cl]·H 2 O, was synthesized sonochemically. The complex anion consists of a chromium(II) ion ligated by two 3-carb-oxy-2-(di-methyl-amino)-propano-ate anions. They coordinate in a bidentate manner, with a carboxyl-ate oxygen atom and the nitro-gen atom cis to each other in the equatorial plane, while the apical position is occupied by a Cl - ion. Hence, the chromium(II) ion is five-coordinate with a quasi-ideal square-pyramidal geometry; τ 5 parameter = 0.01. The complex crystallizes as a monohydrate and in the crystal, the water mol-ecule and the di-methyl-ammonium counter-ion link the complex cations via N-H⋯O, N-H⋯Cl, O water -H⋯O, O-H⋯O water and O-H⋯O hydrogen bonds, forming a supra-molecular framework. There are also a number of C-H⋯O hydrogen bonds present that reinforce the framework structure. The crystal studied was refined as a racemic twin.

acta crystallographica. section e, crystallographic communications

Sonochemical synthesis and crystal structure of dimethylammonium bis[3-carboxy-2-(dimethylamino)propanoato-κ2 N,O 1]chloridochromium(II) monohydrate