Acta Crystallographica Section B

Structural Science

Volume 55, Part 5 (October 1999)

research papers

Acta Cryst. (1999). B55, 752-757 [ doi:10.1107/S0108768199004012 ]

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

A. H. Mahmoudkhani and V. Langer

Abstract: The crystal structure of the title compound, dimethylammonium tetrachlorocobaltate(II), has been determined at four temperatures between 297 and 366 K, in order to investigate possible phase transitions at 313 and 353 K [Kapustianik, Polovinko & Kaluza et al. (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 with temperature. This study reveals that the anomalous variation in electric conductivity and some of the other physical properties of the compound cannot be explained by structural changes.

Keywords: Dimethylammonium tetrachlorocobaltate(II); Phase transitions.