9-Anthracenecarboxylic acid, (triethoxysilyl)methyl ester

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:

2003-01-28

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

1992

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed, 2002-07-09

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

- Storage condition of test material: In the freezer protected from light, under nitrogen
- Treatment of test material prior to testing: The test substance was crushed prior to use

Melting / freezing pt.:

62 °C

Atm. press.:

1 013.25 hPa

Decomposition:

ambiguous

Decomp. temp.:

>= 292 °C

Sublimation:

no

Remarks on result:

other: no atm. press. was stated, 1013.25 hPa were assumed

1st measurement: An endothermic peak was observed between 48 and 85 °C. This effect was probably caused by melting of the substance. The extrapolated onset temperature of the melting peak is 62 °C. An exothermic effect started at about 294 °C, probably caused by reaction or decomposition of the test substance. After the experiment, the sample appeared to have been molten and had a yellow colour. The sample had lost 3 % of its mass.

 

2nd measurement: The endothermic melting peak was observed between 51 and 75 °C. The extrapolated onset temperature of the peak is 62 °C. After the experiment, the sample appeared to have been molten. The colour of the sample was yellow, lighter than after the first measurement. No significant change in mass was observed.

 

3rd measurement: The endothermic melting peak was observed between 48 and 85 °C. The extrapolated onset temperature is 62 °C. A small exothermic effect, which is probably caused by reaction or decomposition of the test substance, started at about 292 °C. The maximum of the effect was reached at about 302 °C. At approximately 309 °C, it changed to slightly endothermic. After the experiment, the sample appeared to have been molten and a yellow colour that was darker than after the second experiment. The sample had lost 12 % of its mass.

Conclusions:

The melting temperature of the test item was determined to be 62 °C (335 K). Probably because of a small amount of impurities, the melting process started already at about 48 °C (321 K). Reaction or decomposition of the test substance was observed above about 292 °C (565 K).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

62 °C

Additional information

The melting temperature of the test substance was determined to be 62 °C (335 K). Probably because of a small amount of impurities, the melting process started already at about 48 °C (321 K). Reaction or decomposition of the test substance was observed above about 292 °C (565 K). Boiling of the test substance was not observed before decomposition started.