dimethyl[[2,2'''-[1,3-propanediylbis(oxy-kO)]bis[3'',5,5''-tris(1,1-dimethylethyl)-5'-methyl[1,1':3',1''-terphenyl]-2'-olato-kO]](2-)]-zirconium

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:

September 2017

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:

other: ASTM E537-07

Deviations:

no

GLP compliance:

no

Other quality assurance:

other: ISO 9001

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

>= 250 °C

Decomposition:

yes

Decomp. temp.:

250 °C

Based on DSC measurement 1 (see attached DSC), no sharp melting point was obtained during the heating up to 400°C. Since the first endotherm has an enthalpy of 17 J/g, this is most likely no melting point. A well-defined melting enthalpy has an enthalpy of ≥ 100 J/g.

To confirm the absence of a melting point as measured in measurement 1, a second DSC measurement was performed with subsequent heating/cooling ramps (see attached DSC heat-cool).

After the first endothermic effect, the sample was cooled from 160°C to 25°C, but no crystallization peak was observed. No further crystallization / melting effects were obtained in the subsequent heating/cooling ramps.

Finally a heating ramp to 400°C was performed, where the exothermic and second endothermic effect were observed, comparable with the first measurement.

Conclusions:

The melting point of Zirconium, dimethyl[[2,2'''-[1,3-propanediylbis(oxy-κO)]bis[3'',5,5''-tris(1,1-dimethylethyl)-5'-methyl[1,1':3',1''-terphenyl]-2'-olato-κO]](2-)]-, (OC-6-33)- was determined according to EC Regulation No 440/2008, Guideline A.1 [1] and according to OECD Guideline 102 [2], and in accordance with European Chemicals Agency (ECHA), Guidance on information requirements and chemical safety assessment, Chapter R.7a, Endpoint specific guidance, May 2008 [3].
The melting point was determined using thermal analysis (DSC).
The test substance did not melt before the decomposition, which start at 250 °C.

Executive summary:

The test substance did not melt before the decomposition, which start at 250 °C.

Description of key information

The test substance did not melt before the decomposition, which start at 250 °C.