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- Title
Phase transition and thermal decomposition of [Al(DMSO)<sub>6</sub>]Cl<sub>3</sub>.
- Authors
Migdał-Mikuli, A.; Górska, N.; Szostak, E.
- Abstract
Phase transition and thermal decomposition of hexadimethylsulfoxidealuminium chloride were studied by differential scanning calorimetry (DSC), thermogravimetry (TG) and simultaneous differential thermal analysis (SDTA). The gaseous products of the decomposition were on-line identified by a quadrupole mass spectrometer (QMS). In the temperature range of 95–300 K, [Al(DMSO)6]Cl3 indicates one phase transition at T =244.96 K (on heating) and at T =220.87 K (on cooling). Large thermal hysteresis of the phase transition (∼24 K) indicates its first order character. Large value of transition entropy (Δ S≈40 J mol−1 K−1) suggests its configurational character. Thermal decomposition of the title compound proceeds in four main stages. In the first stage, which starts just above ca. 300 K, the compound loses two DMSO molecules per one formula unit and undergoes into [Al(DMSO)4]Cl3. In the second stage, the next three DMSO ligands are released and simultaneously decomposed. The third stage, which continues up to ca. 552 K, is connected with a loss of the last DMSO ligand and the formation of AlCl3. In the fourth stage AlCl3 reacts with carbon monoxide that originates from the decomposition of DMSO, and first aluminium oxychloride and next solid Al2O3 plus carbon are created.
- Subjects
PHASE transitions; THERMOGRAVIMETRY; ANALYTICAL chemistry; THERMAL analysis; CALORIMETRY
- Publication
Journal of Thermal Analysis & Calorimetry, 2007, Vol 90, Issue 1, p223
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-006-7694-z