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

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:

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 102 (Melting point / Melting Range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

72.8 °C

Atm. press.:

1 006 - 1 010 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. As the onset temperatures in both tests do deviate by less than 0.5 K from their mean value of 72.84 °C, this temperature can be used as melting point.

A second endothermic effect (boiling) was detected in the temperature range of 290 – 460 °C. No further thermic effects could be observed up to the maximum measured 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:

melting point (at 1006 - 1010 hPa): 72.8 °C

Executive summary:

The test item 2,4-Diethyl-9H-thioxanthen-9-one has a melting point of 72.8 °C at atmospheric pressure (1006 - 1010 hPa) as determined by differential scanning calorimetry [according to EU Method A.1. and OECD Test Guideline 102].

Description of key information

melting point (determined using EU Method A.1 / OECD 102; GLP): 72.8 °C at 1006 - 1010 hPa (arithmetic mean of two determinations)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

72.8 °C

Additional information

The determination of the melting point was carried out by differential scanning calorimetry (DSC) using a procedure designed to be compatible with EU Method A.1 and OECD Test Method 102. 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).