Sonochemical synthesis and crystal structure of dimethylammonium bis[3-carboxy-2-(dimethylamino)propanoato-κ2N,O1]chloridochromium(II) monohydrate

Abstract

The title complex, [(CH3)2NH2][Cr(C6H10NO4)2Cl]·H2O, was synthesized sonochemically. The complex anion consists of a chromium(II) ion ligated by two 3-carboxy-2-(dimethylamino)propanoate anions. They coordinate in a bidentate manner, with a carboxylate oxygen atom and the nitrogen 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; τ5 parameter = 0.01. The complex crystallizes as a monohydrate and in the crystal, the water molecule and the dimethylammonium counter-ion link the complex cations via N—H...O, N—H...Cl, Owater—H...O, O—H...Owater and O—H...O hydrogen bonds, forming a supramolecular 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.

Keywords

• crystal structure
• sonochemical synthesis
• chromium(II) complex anion
• dimethylammonium
• hydrogen bonding
• supramolecular framework