Reaction products of disubstituted alkane, nickel, (Z/E)-substituted alkene, reaction mass of tetraalkyl-3,3’-di(propan-2-yl)-biphenyl-diyl tetrakis(dialkylphenyl) bis(phosphite) and tris(dialkylphenyl) phosphite and zinc halide

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2018-08-23 to 2018-09-12

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Version / remarks:

July 27, 1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Version / remarks:

March 04, 2016

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7220 (Boiling Point / Boiling Range)

Version / remarks:

August 1996

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Atm. press.:

1 013 hPa

Decomposition:

yes

Remarks:

decomposition before boiling

Decomp. temp.:

>= 100 °C

Remarks on result:

not determinable

Remarks:

due to decomposition before boiling

Preliminary test (termogravimetric analyzer, TGA):

The TGA plot of the submission substance is given in the attached figure. Starting at 125°C, the weight of the sample decreased significantly. At 162°C, the sample weight had decreased by 25%. After the experiment, a black molten residue remained in the sample container (original colour: red). The change of the colour indicated reaction and/or decomposition of the test item.

 

Main Study (DSC):

In the experiment performed for determining the melting/freezing point (see IUCLID section 4.2 for details and plot of DSC run) during heating an endothermic effect was observed starting at 100°C. The endothermic effect was probably obtained due to reaction and/or decomposition of the test item (DSC was stopped at 162°C in this experiment). After the experiment, the residue remained unchanged based on visual observation.

To investigate the boiling point and to study the endothermic effect described above in more detail, the actual DSC experiment for determination of the boiling point was performed (see DSC plot in attached figure). Starting around 100°C, a pronounced endothermic effect was observed with a maximum at ca. 162 °C and a return to baseline at ca. 224 °C. Heating was continued up to to 250 °C After the experiment, a black molten residue remained in the sample container (original colour: red). The change of the colour indicated reaction and/or decomposition of the test item.

Boiling of the test item was not observed below the temperature at which reaction and/or decomposition started.

Conclusions:

Reaction and/or decomposition before boiling (OECD 203): endothermic decomposition at >= 100°C

Executive summary:

In a reliable study performed according to relevant guidelines (e.g. OECD 103) and compliant with GLP, the boiling point of the submission substance was to be determined. From differential scanning calorimetry (DSC) between 25 °C and 250 °C, an endothermic reaction peak became obvious:

Starting around 100°C, a pronounced endothermic effect was observed with a maximum at ca. 162 °C and a return to baseline at ca. 224 °C. Heating was continued up to 250 °C. After the experiment, a black molten residue remained in the sample container (original colour: red). The change of the colour indicated reaction and/or decomposition of the test item.

This result is in very good agreement with the DSC run performed earlier for determining the melting/freezing point (cooling phase between 25°C and -90°C with subsequent heating phase till 162 °C). Also in that run an endothermic effect was observed starting at 100°C with the peak not yet reached up to ca. 156 °C, which was the maximum temperature plotted for this DSC.

In conclusion, endothermic reaction and/or decomposition of the test item was observed during DSC experiments at temperatures of > 100°C (> 373K). Boiling of the test item was not observed below the temperature at which reaction and/or decomposition started. Based on this, the test item has no boiling temperature.

Description of key information

Reaction and/or decomposition before boiling (OECD 203): endothermic decomposition at >= 100°C

Additional information

In a reliable study performed according to relevant guidelines (e.g. OECD 103) and compliant with GLP, the boiling point of the submission substance was to be determined. From differential scanning calorimetry (DSC) between 25 °C and 250 °C, an endothermic reaction peak became obvious:

Starting around 100°C, a pronounced endothermic effect was observed with a maximum at ca. 162 °C and a return to baseline at ca. 224 °C. Heating was continued up to 250 °C. After the experiment, a black molten residue remained in the sample container (original colour: red). The change of the colour indicated reaction and/or decomposition of the test item.

This result is in very good agreement with the DSC run performed earlier for determining the melting/freezing point (cooling phase between 25°C and -90°C with subsequent heating phase up to 162 °C). Also in that run an endothermic effect was observed starting at 100°C with the peak not yet reached up to ca. 156 °C, which was the maximum temperature plotted for this DSC.

In conclusion, endothermic reaction and/or decomposition of the test item was observed during DSC experiments at temperatures of > 100°C (> 373K). Boiling of the test item was not observed below the temperature at which reaction and/or decomposition started. Based on this, the test item has no boiling temperature.