Structure of [(CH3)(2)NH2](2)CoCl4 at elevated temperatures

The crystal structure of the title compound, dimethyl-ammonium tetrachloroc obaltate(II). has been determined at four temperatures between 297 and 366 K, in order to investigate possible phase transitions at 313 and 353 K [Kap ustianik. Polovinko & Kaluza et at. (1996). Phys. Status Solidi A, 153, 117 -122]. We found that there is no significant change either in the hydrogen- bonding network or in the cell parameters, apart from a linear dilatation w ith temperature. This study reveals that the anomalous variation in electri c conductivity and some of the other physical properties of the compound ca nnot be explained by structural changes.