Phase polymorphism of [Cd(DMSO)6](ClO4)2 studied by differential scanning calorimetry and transmitted light intensity methods and observed using thermal microscope

Elżbieta Szostak 1Janusz Chruściel 2Arkadiusz Rudzki 2

1. Jagiellonian University, Faculty of Chemistry, Department of Chemical Physics, Ingardena 3, Kraków 30-060, Poland
2. Department of Chemistry, University of Podlasie, ul. 3 Maja 54, Siedlce 08-110, Poland

Abstract

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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Presentation: Poster at E-MRS Fall Meeting 2006, Symposium I, by Elżbieta Szostak
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-11 12:22
Revised:   2009-06-07 00:44
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