5,5'-diisopropyl-2,2'-dimethylbiphenyl-4,4'-diyl dihypoiodite

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

14 March 2018 to 05 April 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

>= 100 - <= 175 °C

Decomposition:

yes

Decomp. temp.:

>= 225 °C

Remarks on result:

other: study performed at atmospheric pressure under a flow of nitrogen

Preliminary Test

Starting at 225 °C, the weight of the sample decreased significantly. At 272 °C, the sample weight had decreased by 25 %.

After the experiment, a brown molten residue remained in the sample container (original colour: yellowish). The change of the colour indicated reaction and/or decomposition of the test material.

Main Test

- Experiment 1: An endothermic peak was observed between 25 and 100 °C. The endothermic effect was most likely obtained due to evaporation of volatile components (based on the weight loss observed during the preliminary test) and melting of the test material.  An endothermic peak was observed between 225 and 272 °C. The endothermic effect was due to reaction and/or decomposition of the test material.

After the experiment, a brown molten residue remained in the sample container.

- Experiment 2: To investigate melting of the test material, a lower start temperature and a repeated heating cycle was applied in the Experiment 2.  During cooling and during the second heating, no effects were observed which were due to crystallisation and melting of the test material. The endothermic effect between 20 and 100 °C observed during the first heating was therefore due to evaporation of volatile components.  After the experiment, an orange/brown residue remained in the sample container.

- Experiment 3 and 4: In order to investigate melting of the test material, Experiment 3 and Experiment 4 were stopped at a temperature of 250 and 175 °C, respectively.  After both experiments, a brown molten residue remained in the sample container.

No clear effect was observed indicating melting of the test material.  

Visually it was observed that the test material was a solid when heated to 100 °C and a liquid when heated to 175 °C.  Therefore it was concluded that the test material has a melting temperature between 100 and 175 °C.

Conclusions:

Under the conditions of the study, the melting point of the test material was determined to be between 100 and 175 °C, when tested under nitrogen at atmospheric pressure.

Executive summary:

The melting point of the test material was investigated in a study which was conducted in accordance with the standardised guidelines OECD 102, EU Method A.1 and EPA OPPTS 830.7200, under GLP conditions, using differential scanning calorimetry.

Under the conditions of the study, the melting point of the test material was determined to be between 100 and 175 °C, when tested under nitrogen at atmospheric pressure.

Description of key information

The melting point of the test material was determined to be between 100 and 175 °C, when tested under nitrogen at atmospheric pressure.

Additional information

The melting point of the test material was investigated in a study which was conducted in accordance with the standardised guidelines OECD 102, EU Method A.1 and EPA OPPTS 830.7200, under GLP conditions, using differential scanning calorimetry. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

Under the conditions of the study, the melting point of the test material was determined to be between 100 and 175 °C, when tested under nitrogen at atmospheric pressure.