Crystal Structure of Magnesium Comenate

Abstract

The coordination compound [Mg(HCom)2(H2O)6]·2H2O (I) was obtained by the reaction of comenic acid (H2Com) with magnesium acetate in water. The formation of a new phase was confirmed by powder X-ray diffraction. The molecular formula of the compound was determined from energy dispersive X-ray fluorescence and thermogravimetry data. The thermo-oxidative stability of magnesium comenate was studied by simultaneous thermal analysis in air. The molecular structure of the complex was discussed on the basis of spectral data (NMR, IR, and UV spectroscopy) and studied in detail using X-ray diffraction (CCDC no. 2 207 835). Magnesium comenate crystallizes in the triclinic system, space group P1¯,the structure is stabilized by intra- and intermolecular hydrogen bonds between the coordinated water molecules, acid anions, and [Mg(H2O)6]2+.