The crystal structures of bis(oxalato)chromium(III) complexes with histamine and B6 vitamin: Na[Cr(ox)2(hm)]·3H2O and Na[Cr(ox)2(PM)]·H2O (hm, histamine; PM, pyridoxamine)

The crystal structures of two bis(oxalato)chromium(III) complexes with histamine and B6 vitamin, Na[Cr(ox)2(hm)]·3H2O (1) and Na[Cr(ox)2(PM)]·H2O (2) (hm, histamine; PM, pyridoxamine) were determined by the single crystal X-ray diffraction technique. In the complexes, hm and PM act as bidendate ligands; hm is coordinated by N atoms of the aminoethyl group and imidazole, and PM by the N atom of the aminoethyl group and the O atom of the phenol group. Two oxalato ligands in the complexes 1 and 2 additionally coordinate to sodium cations by various coordination modes, forming one-dimensional and three-dimensional networks, respectively.