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EC number: 250-774-0 | CAS number: 31714-55-3
Melting point / freezing point
Administrative data
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 06 December 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 018
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- 27 July 1995
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- differential scanning calorimetry
Test material
- Reference substance name:
- Hydrogen bis[1-[(5-chloro-2-hydroxyphenyl)azo]-2-naphtholato(2-)]chromate(1-)
- EC Number:
- 250-774-0
- EC Name:
- Hydrogen bis[1-[(5-chloro-2-hydroxyphenyl)azo]-2-naphtholato(2-)]chromate(1-)
- Cas Number:
- 31714-55-3
- Molecular formula:
- C32H19Cl2CrN4O4
- IUPAC Name:
- [1-{[5-chloro-2-(hydroxy-kappaO)phenyl]diazenyl}-2-naphtholato(2-)-kappaO]{1-[(5-chloro-2-hydroxyphenyl)diazenyl]-2-naphtholato-kappaO}chromium
- Test material form:
- solid: particulate/powder
- Details on test material:
- - Appearance: Black powder
- Storage conditions: At room temperature
Constituent 1
Results and discussion
Melting / freezing pointopen allclose all
- Key result
- Melting / freezing pt.:
- 377.764 °C
- Atm. press.:
- 760 mm Hg
- Remarks on result:
- other: Mean of 3 replicates (SD: +/- 0.657 °C)
- Key result
- Melting / freezing pt.:
- 650.914 K
- Atm. press.:
- 760 mm Hg
- Remarks on result:
- other: Mean of 3 replicates (SD: +/- 0.657 K)
Any other information on results incl. tables
Individual melting points of replicates R1, R2 and R3:
R1: 377.443 °C
R2: 378.519 °C
R3: 377.329 °C
As the difference in replicates is >1K, it is justified to report a melting range, i.e. 377.3 -378.5 °C.
After the endothermic effect, ascribed to melting, heat flow did not return to the level before melting, based on the DSC curves (see DSC curve of test 1 attached below). Therefore it is likely that decomposition occurs right after melting.
Applicant's summary and conclusion
- Conclusions:
- The melting point of T-95/T-99 was determined to be 377.764 ± 0.657 °C (650.914 ± 0.657 K) at an atmospheric pressure of 760 mm Hg.
- Executive summary:
The melting point of T-95/T-99 was determined in a study, performed according to OECD guideline 102 and GLP principles, using the differential scanning calorimeter (DSC) method. The melting point of the test item was determined to be 377.764 ± 0.657 °C (650.914 ± 0.657 K) at an atmospheric pressure of 760 mm Hg.
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