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Physical & Chemical properties

Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
no data
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
comparable to guideline study
Remarks:
Procedure and sample identification are described with sufficient details.
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
183.2 K
Melting / freezing pt.:
-90 °C

 Assay  T transition (K)  T fusion (K)
 1  162.1  183.3
 2  162.2  183.1
 3  162.1  183.2
 mean (+-/ SD)  162.1 +/- 0.1  183.2 +/- 0.1

The exo isomer shows a low-temperature solid-to-solid transition at T = 162.1 K, and a melting temperature of 183.2 K.

Conclusions:
The melting point of exo-THDCPD was determined as 183.2 K (-90.0°C).
Executive summary:

The publication describes the determination of thermodynamical properties, including melting temperature, of the substance, using Differential Scanning Calorimetry. The procedure is equivalent to the OECD guideline. Measurements were performed in triplicate, under nitrogen.

The melting point of exo-THDCPD was determined as 183.2 K.

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
11-8-1976 to 11-7-1977
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Qualifier:
no guideline followed
GLP compliance:
no
Type of method:
differential scanning calorimetry
Melting / freezing pt.:
182.4 K
Melting / freezing pt.:
-90.8 °C
Executive summary:

The melting point of exoTHDCPD was measured at 182.4K using the DSC.

Description of key information

The melting point of exoTHDCPD was measured as 183.2 K (= -90.0°C).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-90 °C

Additional information

Two publications were identified, providing consistent values. However, in Moynihan et al, insufficient experimental details are provided, while Chickos gives a fully reliable description of the determination, comparable to a guideline study. Therefore it is considered as key data.