Bis(O,O-diisopropyl dithiophosphate)bis(cyclohexylamine) zinc

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:

07 May 2015 - 03 Mar 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to other study

Reason / purpose for cross-reference:

reference to other study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

adopted in 1995

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

adopted in 2008

GLP compliance:

yes (incl. QA statement)

Remarks:

Ministerium für Arbeit, Integration und Soziales des Landes Nordrhein-Westfalen, Düsseldorf, Germany

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

Storage conditions: at room temperature, tightly closed, dry

Remarks on result:

not determinable

Results
A preliminary thermogravimetric measurement was done over temperature range from room temperature to ca. 600 °C. Several mass loss steps were registered with a total mass loss of 74.2%. The residue looked black and incrusted. The course of the thermographic curve indicated the decomposition of the test item.

Test 1
Two DSC measurements were done in the temperature range 20 – 300 °C. The course of the heat flow curves showed two endothermic peaks (at max. 73 °C and 111 °C). This could be an indication for a two-phase melting. On the other hand the first peak could result from a phase transition (solid/solid) and the second one could result from the real melting. Further experiments were needed to clarify this.

Upon further heating the heat flow curves showed a very noisy course indicating decomposition prior to boiling. There was no evidence for a signal indicating boiling. Reweighing after the measurement showed that the sample had lost 55.5%/55.2% of its mass. The remaining residues looked yellow and melted.

Test 2
To clarify the melting behavior a second test with two different measurements was done.

A 1^st measurement was made with heating until 80 °C (ca. the first endothermic peak from test 1). The peak at max. 74 °C could be seen again. After cooling down the residue looked visually unchanged and no mass loss could be measured.

A 2^nd measurement was done with a first heating to 80 °C, cooling-down and a second heating-step again to 80 °C. here the peak at 74 °C could be seen too but during the second heating it could not be reproduced. Probably it is a matter of an irreversible phase transition and not a melting process. After cooling down the residue looked visually unchanged and no mass loss could be measured.

Conclusion: The test item has no melting point

Description of key information

No melting point determined (DSC, OECD 102)

Additional information

DSC measurements showed endothermic peak at 73 °C. This peak could result from a irreversible phase transition (solid/soild) and is not a melting process. Therefore there is no melting point can be determined.