5-[[4-chloro-6-[(3-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[[4-[[2-(sulphooxy)ethyl]sulphonyl]phenyl]azo]naphthalene-2,7-disulphonic acid, sodium salt

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:

2014-02-05 - 2014-02-10

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline 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

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Deviations:

no

GLP compliance:

no

Other quality assurance:

ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)

Type of method:

capillary method

Remarks:

and thermal analysis

Decomposition:

yes

Decomp. temp.:

> 230 °C

Remarks on result:

other: The test item has no melting point. The test item decomposed.

The DSC-measurement in a closed glass crucible with the test item showed multistage exothermal effects in the temperature range 150 – 335 °C with an energy release of 391 J/g.

 

Two measurements with the test itemshowed a broad endothermal effect in the temperature range 135 to 185 °C and 130 – 200 °C, respectively.

Two exothermal effects were detectedin the temperature range 235 – 375 °C with an energy release of 244 J/g (1^st measurement) and 220 J/g (2^nd measurement), respectively, and in the temperature range 380 – 450 °C with an energy release of 11 J/g (1^st measurement) and 8 J/g (2^nd measurement), respectively. About 2/3 of the weight of the test item remained in the crucible after the measurement.

 

Additional measurements with the capillary method were performed in order to clarify the broad endothermal effect of the DSC measurements in the temperature range of 135 – 185 °C, which may be attributed to evaporation of the water content of the test item (8.8 wt.-% H₂O content according to the certificate of analysis).

 

No.	Set point	Heating rate	End point	Melting point/range	Remarks
1	50 °C	10 K/min	230 °C	Not detected	Starting at approx. 106 °C some liquid distilled off, and condensed at the cold part of the capillary outside the heating block. The solid material remained unchanged without melting up to approx. 230 °C.
1	50 °C	10 K/min	230 °C	Not detected	Starting at approx. 105 °C some liquid distilled off, and condensed at the cold part of the capillary outside the heating block. The solid material remained unchanged without melting up to approx. 230 °C.

Thus it was concluded, that the test item showed no melting. The test item decomposed.

Conclusions:

The test item has no melting point. The test item decomposed.

Description of key information

Substance decomposes prior to melting

Additional information

No melting point determined up to 500 °C. Substance decomposes before melting.