2,4-Imidazolidinedione, 5-(phenylmethylene)-, (5Z)-

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2020-10-29

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2020

Report date:

2020

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Remarks:

and capillary method

Test material

Test material information

Constituent 1

Reference substance name:

(5Z)-5-(phenylmethylidene)imidazolidine-2,4-dione

EC Number:

700-728-5

Cas Number:

74805-60-0

Molecular formula:

C10H8N2O2

IUPAC Name:

(5Z)-5-(phenylmethylidene)imidazolidine-2,4-dione

Test material form:

solid: particulate/powder

Results and discussion

Melting / freezing point

Key result

Melting / freezing pt.:

215.1 °C

Atm. press.:

ca. 1 008 hPa

Decomposition:

no

Any other information on results incl. tables

DSC-measurements:
The test item showed three broad endothermic effects in the temperature ranges of approx. 60 – 130 °C, 200 – 230 °C and 270 – 400 °C, respectively.

Results of the DSC-measurements:

Measurement No.	Sample weight / mg	Onset of Effect / °C	Range of effect / °C	Weitght loss / mg	Atmospheric pressure / hPa
1	7.45	101.02 215.0 342.47	60 - 130 (endo) 200 - 230 (endo) 270 - 400 (endo)	6.57	1008.0
2	9.04	102.28 215.13 336.44	60 - 130 (endo) 200 - 230 (endo) 280 - 380 (endo)	7.43	1007.7

 

Measurements by the Capillary Method:
Since the three endothermic effects could not clearly be assigned to the melting of the test item, the melting behaviour of the test item was checked visually by an additional measurement with the capillary method in the temperature range of 25 – 250 °C at a heating rate of 10 K/min. Here, a melting of the test item could be observed at a temperature of 220.9 °C. Accordingly, the second endothermic effect of the the DSC measurements can be assigned to the melting of the test item. Since the onsets of the two DSC measurements do not differ by more than 0.5 K from their mean value of 215.07 °C, the mean is used as melting point. Therefore, the test item has a melting point of 215.1 °C. Besides, the first endothermic effect in the DSC can be assigned to evaporating components (e.g. water) and the third one to another physical effect (potentially boiling).

 

Final Results:
The test item Z-Benzalhydantoin (Z-BH) has a melting point of 215.1 °C at atmospheric pressure (1008 hPa) as determined by Differential Scanning Calorimetry and by the capillary method according to Regulation (EC) No 440/2008 Method A.1. and OECD Test Guideline 102 (1995).

Applicant's summary and conclusion

Conclusions:

The melting temperature was determined to be 215.1 °C.