Copper, [29H,31H-phthalocyaninato(2-)-N29,N30,N31,N32]-, aminosulfonyl sulfo derivs., sodium salts

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Study period:

November 18th, 2015

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Justification for type of information:

REPORTING FORMAT FOR THE ANALOGUE APPROACH
The usage of information on Direct Blue 199 Na/NH4, which has the same main component and with a different counter ion, can be considered as suitable and appropriated because the difference in salification is expected to not influence the characteristics related to the specific end-point.
The impurity profile does not impact on the read across proposed. Details on the approach followed are included in the document attached to the IUCLID section 13.

Reason / purpose for cross-reference:

read-across source

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

adopted July 27, 1995

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

GLP compliance:

no

Type of method:

differential scanning calorimetry

Decomposition:

yes

Decomp. temp.:

340 - 380 °C

First experiment: the first endothermic peak was observed between start temperature and 230 °C, probably caused by the water evaporation. The second endothermic peak very low intensity was observed between 340 and 380 °C, caused by the thermal decomposition of the test substance. After the experiment the sample had lost 0.61 mg (32.97 %) of its mass and the residue had a black colour.

 

Second experiment: the endothermic peak was observed between start temperature and 225 °C, caused by the water evaporation. The second endothermic peak very low intensity was observed between 340 and 380 °C, caused by the thermal decomposition of the test substance. After the experiment the sample had lost 0.48 mg (21.92 %) of its mass and the residue had a black colour.

Third experiment: the endothermic peak was observed between start temperature and 225 °C, caused by the water evaporation. After the experiment the sample had lost 0.19 mg (8.88 %) of its mass and the aspect was not change.

Conclusions:

Melting temperature of the test substance could not be determined because of thermal degradation (at 340 - 380 °C) of the test substance.

Executive summary:

The melting temperature of the test substance was investigated. The Differential Scanning Calorimetry method was used. The procedures used in the study were in accordance with OECD Test Guideline No.102. 

At the temperature of 230 °C an endothermic reaction was recorded, which was probably caused by the water evaporation. A second endothermic peak very low intensity was observed between 340 and 380 °C, caused by the thermal decomposition of the test substance. After the experiment the sample had lost of its mass and the residue had a black colour.

 

Conclusion

Melting temperature of the test substance could not be determined because of thermal degradation of the test substance.

Description of key information

Decomposition before melting (340-380 °C)

Additional information

Differential Scanning Calorimetry - OECD 102