bis({9-[2-(carboxy-κO)phenyl]-6-(bis(tallow alkyl hydrogenated)amino)-3H-polyheterocycl-3-ylidene}-3-bis(tallow alkyl hydrogenated)iminium) zinc(2+) dichloride

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

12 February 2009 - 08 May 2009

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: This study has been performed according to OECD and EC guidelines and according to GLP principles.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2009

Report date:

2009

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

other: differential scanning calorimetry

Test material

Test material information

Constituent 1

Details on test material:

Substance type: dark purple waxy solid
- Physical state: solid
- Stability under storage conditions: stable
- Storage condition of test material: at room temperature in the dark

Results and discussion

Melting / freezing point

Atm. press.:

101.325 kPa

Decomposition:

yes

Decomp. temp.:

> 300 °C

Remarks on result:

other: With the DSC experiments it was found that Custom Red #3 has a ‘softening point’ and no ‘melting temperature’. The softening point of the compound starts at 40°C (313K).

Any other information on results incl. tables

Preliminary test: From approximately 350°C upwards the weight of the sample decreased significantly. At 407°C, the sample weight had decreased by 25%. After the experiment, a charred residue was observed on the lid of the sample container and a black molten residue (original colour: dark purple) remained in the sample container. The change of the colour indicated reaction and/or decomposition of the test substance.

 

Main study: During the first experiment an endothermic peak was observed between 25°C and 75°C. The extrapolated onset temperature of the peak was 45.05°C. Melting of the test substance was most likely the reason for the effect. Starting at 300°C a relatively broad endothermic effect was found. Reaction and/or decomposition of the test substance caused most likely this effect. After the experiment, a dark purple molten residue remained in the sample container.

To investigate the melting peak of the test substance a repeated heating cycle at a lower heating rate was applied. With the first heating the extrapolated onset temperature of the endothermic peak was 40.47°C. With the second heating no melting of the test substance was observed. Crystallization of the compound during cooling was also not found. The results demonstrated that the test substance remained in an amorphous state after melting. Based on this it was concluded that the test substance has no ‘melting point’ but it has a ‘softening point’ as also informed by the sponsor. The softening point of the test substance starts at 40°C.

 

With the second heating the endothermic effect due to reaction and/or decomposition of the test substance was observed between 300°C and 375°C. After the experiment, a dark purple molten residue remained in the sample container.

 

Applicant's summary and conclusion

Conclusions:

With the DSC experiments it was found that Custom Red #3 has a ‘softening point’ and no ‘melting temperature’. The softening point of the compound starts at 40°C (313K).