Registration Dossier
Registration Dossier
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EC number: 257-479-6 | CAS number: 51858-17-4
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:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 018
- Report date:
- 2018
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- 1995
- GLP compliance:
- not specified
- Type of method:
- differential scanning calorimetry
Test material
- Reference substance name:
- Dipotassium dihydrogen 4-[5-[3-carboxylato-5-hydroxy-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl]penta-2,4-dienylidene]-4,5-dihydro-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazole-3-carboxylate
- EC Number:
- 257-479-6
- EC Name:
- Dipotassium dihydrogen 4-[5-[3-carboxylato-5-hydroxy-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl]penta-2,4-dienylidene]-4,5-dihydro-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazole-3-carboxylate
- Cas Number:
- 51858-17-4
- Molecular formula:
- C25H16N4O12S2.2K
- IUPAC Name:
- dipotassium dihydrogen 4-{5-[3-carboxylato-5-oxo-1-(4-sulfonatophenyl)-1,5-dihydro-4H-pyrazol-4-ylidene]penta-1,3-dien-1-yl}-5-hydroxy-1-(4-sulfonatophenyl)-1H-pyrazole-3-carboxylate
- Test material form:
- solid: crystalline
Constituent 1
Results and discussion
Melting / freezing point
- Decomposition:
- yes
- Remarks:
- The substance decomposes before melting.
- Decomp. temp.:
- > 280 °C
- Remarks on result:
- not determinable
Any other information on results incl. tables
1. Endothermic effect at 50 - 200 °C:
- Peak 92.95 °C
- Enthalpy 326.68 J/g (release of water)
2. Exothermic effect at 280 - 420 °C:
- Peak 406.78 °C
- Enthalpy -342.07 J/g (decomposition)
Applicant's summary and conclusion
- Conclusions:
- The endothermic effect shown at the DSC spectrum is not the melting point of the substance but the boiling point of the solvent (water). The exothermic effect starts at 280 °C when the substance decomposes. Therefore, the substance decomposes before melting point.
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