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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
GLP compliance:
no
Type of method:
thermal analysis
Melting / freezing pt.:
ca. 189.8 °C
Atm. press.:
ca. 1 atm
Decomposition:
yes
Decomp. temp.:
ca. 189.8 °C

A first transition is observed at -31.20°C probably due to the transition from the crystalline to the amorphous phase. A second endothermic process is recorded at 189 .8°C (reaarrangement of the physical state of the substance). A second scan shows that the first transition is less present and that no other phenomenon is recorded anymore, which triggers the results of modification of the structure of the substance. These findings are confirmed by IR analyses that show different vibrations of the substance before and after the phenomenon, most likely a decomposition of the substance during melting.

Conclusions:
The substance was tested for melting point determination following OECD 102 (DSC analysis). Under the experimental conditions the melting point/decomposition is 189.8°C, enthalpy 95.8 J/g.
Executive summary:

The substance was tested for melting point determination following OECD 102 (Ricci, 2016). Under the experimental conditions an endothermic process, more likley a melting transition with decomposition process, is observed at 189.8°C, with an enthalpy energy of 95.8 J/g. A second scan in the same range of temperatures did not show any process anymore and the IR vibrations of the substance before and after the transition are diffirent, demonstrating a chemical rearrangment of the substance (decomposition).

Description of key information

decomposition at 189.8°C

Key value for chemical safety assessment

Additional information

The substance was tested for melting point determination following OECD 102 (Ricci, 2016). Under the experimental conditions an endothermic process, more likley a melting transition with decomposition process, is observed at 189.8°C, with an enthalpy energy of 95.8 J/g. A second scan in the same range of temperatures did not show any process anymore and the IR vibrations of the substance before and after the transition are diffirent, demonstrating a chemical rearrangment of the substance (decomposition).