Registration Dossier

Administrative data

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
25.2.2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study is performed in accordance to Guideline study.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010
Report Date:
2010

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: ASTM E 537-07
Deviations:
yes
Remarks:
Temperature range, T0 (onset temperature) not listed.
GLP compliance:
no
Type of method:
other: Differential Scanning Calorimetry

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): 3,4-Ethylenedioxythiophene
- Substance type: pure organic substance
- Physical state: liquid near colourless to pale yellow
- Analytical purity: > 99%
- Lot/batch No.: CETA 9/10 EDOT (091201)
- Expiration date of the lot/batch: 21.1.2011
- Storage condition of test material: Keep in dark at room temperature. Stored in amber glass bottles under the argon atmosphere. Minimalize time for handling with substance without protective argon atmosphere as possible. Maximal time without protective atmosphere is 30 min.

Results and discussion

Melting / freezing point
Melting / freezing pt.:
11.7 °C
Atm. press.:
101.3 kPa

Any other information on results incl. tables

EDOT crystallizes under the experimentl conditions used in the temperature range approx. -40 °C to -38 °C. On the heating curve, two melting peaks with the peak temperature (Tp) at 6.4 °C and 13°C are detectable. The peak with higher heat of fusion at 13°C is supposed to belong to the melting of the main component.

The transition temperature (melting point) is, e.g. according to ISO 11357 -1, defined as the intercept of the extrapolated baseline and the tangent to the leading flank of the transition peak at the point of maximum gradient, which is the tempearture Ts according to ASTM E537.

Applicant's summary and conclusion

Conclusions:
The melting point of the test substance, 3,4-ethylenedioxythiophene, is 11.7 °C.