2,4-diethyl-9H-thioxanthen-9-one

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017-04-12 - 2017-06-01

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:

OECD Guideline 103 (Boiling Point/Boiling Range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Boiling pt.:

423.7 °C

Atm. press.:

1 013 hPa

During the heating phase a distinct endothermic effect was observed in the temperature range of 60 – 90 °C, which can be assigned to the melting of the test item. The test item showed a second endothermic signal in the temperature range of 290 – 460 °C that can be assigned to the boiling of the test item.

For the correction of the boiling temperature to standard pressure the test item was assigned to chemical group 1 (e.g. antraquinone). According to appendix 7.2 a correction value φ = 5.15 was used for the temperature of 400 °C.

The lowest measured onset temperature is corrected to the standard pressure to be 423.54 °C and the highest onset temperatureto be 423.81 °C. As the corrected onset temperatures in both tests deviate by less than 0.5 K from their mean value of 423.68 °C, the test item has a boiling point of 423.7 °C.

No further thermal effects were observed up to the test end temperature of 500 °C.

Table: Results of the DSC-measurements

Sample weight / mg	Onset of effect / °C	Range of effect / °C	Weight loss / mg	Atmospheric pressure / hPa
15.24	72.86 423.32	60 – 90 (endo) 290 – 450 (endo)	15.21	1009.5
17.81	72.81 423.39	60 – 90 (endo) 290 – 460 (endo)	17.81	1006.0

Conclusions:

boiling point (at 1013 hPa): 423.7 °C

Executive summary:

The test item 2,4-Diethyl-9H-thioxanthen-9-one has a boiling point at atmospheric pressure (1013 hPa) of 423.7 °C as determined by differential scanning calorimetry [according to EU Method A.2. and OECD Test Guideline 103].

Description of key information

boiling point (determined using EU Method A.2 / OECD 103; GLP): 423.7 °C at 1013 hPa (arithmetic mean of two determinations)

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

423.7 °C

Additional information

The determination of the boiling point was carried out by differential scanning calorimetry (DSC) using a procedure designed to be compatible with EU Method A.2 and OECD Test Method 103. A reliability score of 1 was assigned, in accordance with the criteria for assigning data quality in line with the principles described by Klimisch (1997).