1-[2-(allyloxy)ethyl-2-(2,4-dichlorophenyl)-1H-imidazolium hydrogen sulphate

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:

11 February - 9 April 2002

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

GLP compliance:

not specified

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

- Batch n°: ZR027180PUG231
- Analytical purity: 99.3%
- Expiration date: 9 November 2006
- Storage condition: at room temperature, 10 to 30°C

Key result

Melting / freezing pt.:

>= 128.6 - <= 132.6 °C

Atm. press.:

1 013.25 hPa

Decomposition:

no

Initial Scan

Two thermal events were observed. A sharp endothermic peak was observed between ca. 129 and 133°C and was assumed to be the melting point. A broad endotherm commencing at 235°C was also present, and its shape, together with the appearance of a red-brown residue in the pan after testing, indicating that the test substance had boiled with a chemical change.

It was decided to proceed with a second scan to identify whether or not the former represented a true melting.

Additional Scan - Melting Event

This scan showed a sharp endotherm between ca. 128 and 133°C and replicates well the values observed in the initial scan. Results from the scans are detailed in table below

Table: Summary of Thermal Properties

Scan	Segment	Onset temp (°C)	Peak temp (°C)	Enthalpy (J/g)
1	-	128.8	132.7	-71.3
2	Segment 1	128.4	132.4	-71.6
2	Segment 4	130.2	133.7	-64.8
Mean of 1 and 2.1		128.6	132.6	-71.4

The first endotherm is assumed to be the melting point of the test material. This peak is "clean" in appearance (no additional peaks) suggesting that the test material does not decompose at its melting temperature.

Conclusions:

A melting endotherm with a mean onset of 128.6°C and a mean peak at 132.6°C was observed.

Description of key information

In a key study (K1, Bates, 2002) according to the OECD guideline 102 and EC method A.1 assessing the thermal behaviour of the test substance by differential scanning calorimetry, a melting endotherm with a mean onset temperature of 128.6°C  and a mean peak temperature of 132.6°C was observed.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

130.6 °C

Additional information

Based on the observed mean onset temperature of 128.6°C and a mean peak temperature of 132.6°C, the mean value was calculated for the melting point used in the CSA.