Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
Melting point / freezing point
Administrative data
- 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:
- other: GLP and Guideline Study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 014
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- thermal analysis
Test material
Constituent 1
Results and discussion
Melting / freezing point
- Melting / freezing pt.:
- 238 °C
- Decomposition:
- no
- Sublimation:
- no
Any other information on results incl. tables
Heating the amorphous-crystalline form of the test item showed a sharp melting point at 238.0 ± 0.2 °C. By cooling down this melt to 50°C no exothermal re-crystallization could be observed. The test item became a solidified melt. Therefore, in the second heating the melting point could not be reproduced. For the calculation of the melting point the values measured in the first heating step were used. The melting point of the test item was: tmp = 238.0 ± 0.22 °C (Tmp = 511.2 ± 0.22 K).
Due to the fact, that the melting point of the test item was irreversible, it was verified by NMR, that the molecular structure of the test item was predominantly unchanged after melting. Therefore a sample of the test item (approximately 15 mg) was tempered for 10 minutes at 248 °C. The sample was completely molten and slightly yellowish afterwards. Deuterated benzene was added and then the sample was dissolved therein. The recorded NMR-Spectrum showed that 80 % of the test item molecules were still present. But 20 % of the substance had degraded. An analysis of the degradation products has not been conducted.
Applicant's summary and conclusion
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