Registration Dossier

Administrative data

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Jan - March 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2019

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
2016
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Version / remarks:
1998
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Details on test material:
- Identification: Zirconium (IV) acetylacetonate (Zr-acac)
- Description: White to off-white powder
- Storage conditions: At room temperature

Results and discussion

Melting / freezing point
Key result
Melting / freezing pt.:
196.4 °C
Decomposition:
yes
Decomp. temp.:
ca. 200 °C
Remarks on result:
other: reaction and/or decomposition of the test item during and directly after melting

Any other information on results incl. tables

Two experiments were performed to investigate the melting (and boiling) behaviour of the substance.

DSC EXPERIMENT 1

An endothermic peak was observed between 175°C and 200°C directly followed by another small endothermic and an exothermic effect (see the illustration below). The extrapolated onset temperature of the first effect was 196.567°C. The endothermic effect was most likely caused by melting of the test item. The second endothermic effect and the exothermic effect were probably caused by reaction and/or decomposition of the test item.

After the experiment, a dark brown molten residue remained in the sample container (original colour: white to off-white). The change of the colour indicated reaction and/or decomposition of the test item.

DSC EXPERIMENT 2

In order to investigate the melting peak, in Experiment 2 heating was stopped directly after the melting effect. The extrapolated onset temperature was 196.218°C. After the experiment, a yellow molten residue remained in the sample container. The change of the colour indicated reaction and/or decomposition of the test item. It was therefore concluded that melting was the reason for the endothermic effect and that the test item had reacted and/or decomposed during and directly after melting.

DATA HANDLING

The melting temperature was determined as the mean melting temperature of Experiment 1 and Experiment 2.

Applicant's summary and conclusion

Conclusions:
The melting temperature of the substance was determined to be 196.4°C.