Anthra[9,1,2-cde]benzo[rst]pentaphene-5,10-dione, bromo derivatives

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:

February 26, 2018 - May 03, 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

no

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

> 500 °C

Melting point / melting range: DSC measurement

Two DSC measurements with a heating rate of 10 K/min showed a wide range endothermal effect in the temperature range of 50 – 240 °C. The onset temperature (seeTable1) was derived from the intersection of the tangent line with the highest slope of the endothermal peak with the baseline. The results of the DSC measurements are summarized in Table 1.

Table1: Melting point (DSC measurements)

Ident No.	Test item / mg	Starting temperature / °C	Final test temperature / °C	Temperature range (endo-thermal) / °C	Onset / °C	Crucible	Observations after the measurement
36837	12.09	25	500	50 –240	100.7	Aluminium with a hole	Black caked powder Mass loss: 21%
36839	13.09	25	250	50– 235	99.1	Aluminium with a hole	Black powder Mass loss: 5%

An additional measurement with the capillary method was performed in order to clarify the melting range.

Melting point / melting range: capillary tube in a metal block

A measurement with the capillary method was performed to clarify the results of the DSC measurements. Since this measurement was performed only as a verifying screening a high heating rate of 10 K/min was chosen and therefore the absolute temperature values derived with the capillary method are not as accurate as the DSC results. The filling height of the test item was approximately 5 mm. The results are summarized in Table 2.

Table2: Results of the capillary method

No.	Set point / °C	Heating rate / K/min	End point / °C	Remarks
1	25	10	250	Approx. 140 °C: condensate formation in upper part of capillary Approx. 140 - 250 °C: no further change (test item was not melted)

Under consideration of the results from the DSC measurements, the capillary method and the visual inspection after the measurement it was concluded that the test item had no melting point at atmospheric conditions.

Executive summary:

The test item had no melting point at atmospheric conditions.

Description of key information

The test item had no melting point at atmospheric conditions.