Molybdenum, bis(N,N-dibutylcarbamodithioato-κS,κS')dioxodi-μ-thioxodi-, stereoisomer

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Version / remarks:

May 2008 (Commission Regulation (EC) No 440/2008)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Version / remarks:

July 1995

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

Decomposition:

yes

Remarks:

reaction and/or decomposition was observed during melting

Remarks on result:

other: The test item has no boiling temperature

Preliminary Test

The TGA curve of the test item is shown in Figure 1 in the attached document "S-600 - Melting and Boiling Temperature.pdf". Starting at 325°C, the weight of the sample decreased significantly. At 341°C, the sample weight had decreased by 25%. After the experiment, black residue was observed on the lid of the sample container and a black residue remained in the sample container (original colour: yellow). The change of the colour indicated reaction and/or decomposition of the test item.

 

Main Study

After the first experiment, a black molten residue (original colour: yellow) remained in the sample container. Three endothermic peaks were observed:

one between 150°C and 200°C;

one between 225°C and 300°C. The extrapolated onset temperature of this peak was 269.590°C. This endothermic effect was most likely obtained due to melting of the test item; and

one starting at 300°C (this endothermic effect was due to reaction and/or decomposition of the test item).

In order to investigate the endothermic peak between 225°C and 300°C, Experiment 2 was stopped directly after the endothermic effect at a temperature of 285°C. The extrapolated onset temperature was 271.066°C. A brown molten residue remained in the sample container after the experiment. The appearance of the residue demonstrated that melting in combination with reaction and/or decomposition was the reason for the endothermic effect.

In order to investigate the endothermic peak between 150°C and 200°C, Experiment 3 was stopped directly after the endothermic peak. After the experiment, the sample appeared to have been unchanged, i.e. no decomposition and/or melting were observed. Therefore, the reason for the endothermic effect was unknown.

Reaction and/or decomposition of the test itemwas observed during DSC experiments during and after melting. 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.

DSC curves are shown in the attached document "S-600 - Melting and Boiling Temperature.pdf"). 

Conclusions:

Reaction and/or decomposition of the test item was observed during DSC experiments during and after melting. 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

no boiling temperature (EU A.2, OECD 103, OPPTS 830.7220)

Additional information

No boiling point was determined. Reaction and/or decomposition of the test item was observed during and after melting.