The differential scanning calorimetry (DSC) measurements made for [Cd(DMSO)₆](ClO₄)₂ (called HC) in the temperature range of 298-473 K indicated very rich and interesting phase polymorphism of this compound [1]. On the basis of the obtained results we can conclude that the number and kind of the phase trasitions strongly depend on so called "thermal history" of the samples. The crystallization of HC undergoes in a specific way because some of the phases can be very easily supercooled. In the examined temperature range four solid phases of HC have been detected (two of them are stable and two metastable). The title compound melts at 465 K. In order to see if the observed phase transitions are connected with a change of the texture of the sample the transmitted light instensity (TLI) and thermal microscope (TMP) measurements were made.The TMP observation confirmed that all phases, investigated by the DSC method, are the solid ones, and that HC melts at 465 K. The TLI measurements show that some of the phase transitions are connected with a change of the sample texture, and can be observed as anomalies on the TLI curves.

[1] A. Migdal-Mikuli, E. Mikuli, E. Szostak, J. Serwońska, Z. Naturforsch 58a, 341 (2003).

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1. Phase polymorphism of [Ni(DMSO)₆](ClO₄)₂ and [Ni(DMSO)₆](BF₄)₂ compounds studied by differential scanning calorimetry