sodium;2-hexadecylsulfanyl-1H-benzimidazole-5-sulfonate

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017-2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

July 27, 1995

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

May 1, 2008

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Version / remarks:

March 1998

Deviations:

no

GLP compliance:

yes

Type of method:

differential scanning calorimetry

Test material

Test material information

Constituent 1

Reference substance name:

sodium;2-hexadecylsulfanyl-1H-benzimidazole-5-sulfonate

EC Number:

616-081-6

Cas Number:

743423-33-8

Molecular formula:

C23 H37 N2 Na O3 S2

IUPAC Name:

sodium;2-hexadecylsulfanyl-1H-benzimidazole-5-sulfonate

Test material form:

solid: particulate/powder

Results and discussion

Melting / freezing point

Key result

Decomposition:

yes

Remarks:

Reaction and/or decomposition of the test item was observed during DSC experiments at temperatures of > 175°C (> 448K).

Remarks on result:

not determinable

Any other information on results incl. tables

Preliminary Test

Starting at 325°C, the weight of the sample decreased significantly. At 385°C, the sample weight had decreased by 25%.After the experiment, a black charred residue remained in the sample container (original colour: off white). The change of the colour indicated reaction and/or decomposition of the test item.

Main Study

An endothermic peak was observed between 25°C and 150°C. The endothermic effect was most likely obtained due to the evaporation of impurities. An endothermic effect was observed between 200°C - 250°C followed by an endothermic effect starting at 300°C. The endothermic effect between
200°C - 250°C was most likely obtained due to melting of the test item. The endothermic effect starting at 300°C was probably obtained due to reaction and/or decomposition of the test item.

After the experiment, a brown charred residue remained in the sample container (original colour: off white). The change of the colour indicated reaction and/or decomposition of the test item. 

In order to investigate the endothermic peak between 25°C and 150°C, Experiment 2 was stopped directly after the peak.  After the experiment, residue was unchanged. It demonstrated that evaporation of impurities was the reason for the endothermic effect.

In order to investigate the melting peak, Experiment 3 was stopped directly after the melting peak. After the experiment, a light yellow residue remained in the sample container (original colour: off white). The change of the colour indicated reaction and/or decomposition of the test item and not melting. 

Applicant's summary and conclusion

Conclusions:

The melting and boiling temperature of V182675 were tested by DSC.
Reaction and/or decomposition of the test item was observed during DSC experiments at temperatures of > 175°C (> 448K). Melting and/or 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 melting and/or boiling temperature.