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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017-08-14 - 2017-08-25
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling Point)
GLP compliance:
no
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
- Storage condition of test material: Tightly closed, dry
Key result
Decomposition:
yes
Decomp. temp.:
>= 200 °C
Remarks on result:
other: Decomposition before boiling

The test item Vanadium(lll) acetylacetonate melts at 188 °C and decomposes at 200°C into Vanadyl acetylacetonate and Pent-3-en-2-one. Therefore the boiling point is not detectable because decomposition takes place before boiling.

The substance Identity of the decomposition product was proven by an additional experiment:

The 1g of test item Vanadium(lll) acetylacetonate was heated under Argon for 1h to 210"C. After cooling to room temperature an IR Spectra of the Vanadium(lll) acetylacetonate, Vanadyl acetylacetonate (Reference material) and the solid decomposition product were recorded.

The IR spectra of the solid decomposition product matches with the IR spectra of Vanadium(lll) acetylacetonate.

At the decomposition point the other decomposition product Pent-3-en-2-one evaporates (enthalpy of vaporization, endothermic, see the endothermic peak at 200 °C for decomposition).

The Vanadyl acetylacetonate melts at 260°C and decomposes endothermic in Vanadium oxide at 325 °C.

Conclusions:
The test substance melts at 188 "C and decomposes endothermic at 200 °C. No boiling point detectable; decomposition before boiling.
Executive summary:

The boiling point of the test material was determined in a non-GLP study experimentally using the ASTM E537 - 12 - Standard Test Method for The Thermal Stability of Chemicals by Differential Scanning Calorimetry according to OECD guideline 103. The test material melts at 188 °C and decomposes at 200 °C. No boiling point was detectable because decomposition took place before boiling. No significant exothermic effects were observed up to 500 °C.

Description of key information

The boiling point of the test material was determined in a non-GLP study experimentally using the ASTM E537 - 12 - Standard Test Method for The Thermal Stability of Chemicals by Differential Scanning Calorimetry according to OECD guideline 103. The test material melts at 188 °C and decomposes at 200 °C. No boiling point was detectable because decomposition took place before boiling. No significant exothermic effects were observed up to 500 °C.

Key value for chemical safety assessment

Additional information