2-[4-[(2-chloro-4-nitrophenyl)azo]-N-(2-cyanoethyl)anilino]ethyl acetate

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:

February 07th, 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

adopted July 27, 1995

Qualifier:

according to guideline

Guideline:

other: OECD Guideline 113 (Screening Test for Thermal Stability and Stability in Air)

Version / remarks:

adopted May 12, 1981

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

The test item was used in its initial form.

Melting / freezing pt.:

96 - 127 °C

Atm. press.:

1 atm

Decomposition:

yes

Decomp. temp.:

252 - 344 °C

Before the test the appearance of test item was red, clay; after the experiments the test item became black melts with bubbles in the melt.

During the heating two consecutive endothermic peaks were observed in the temperature range of approx. 96 ˗ 127 °C, which can be associated with the melting of the test item. Afterwards, in the temperature range of approx. 252 ˗ 344 °C two contiguous exothermic decomposition reaction peaks were observed.

Summary of the DSC Test of Test Item

Peak 1	Onset of effect (°C)	Endset of effect (°C)	Left Limit (°C)	Right Limit (°C)	Area (mJ)	Test item ΔH (g/J)
Sample 1	94.86	112.69	32.57	117.93	-9062.81	910.84
Sample 2	98.08	113.71	50.49	118.87	-7564.37	750.43
Mean	96.47	113.2	41.53	118.4	-	-
Peak 2
Sample 1	121.44	127.44	118.05	129.67	-229.72	23.09
Sample 2	120.16	126.44	118.91	128.34	-166.39	16.51
Mean	120.8	126.94	118.48	129.01	-	-
Peak 3
Sample 1	288.29	307.76	252.58	343.93	2979.97	-299.49
Sample 2	280.43	303.94	251.82	343.82	3488.71	-346.1
Mean	284.36	305.85	252.2	343.88	-	-

Data of weight and weight loss of the DSC run in the first experiment

Sample weight [mg]	Total loss of mass of the sample (%)
9.95	72.7

Values of the DSC run in the first experiment

	Onset of effect (°C)	Endset of effect (°C)	Left Limit (°C)	Right Limit (°C)	Area (mJ)	Test item ΔH(J/g)
Peak 1	94.86	112.69	32.57	117.93	-9062.81	910.84 (endothermic)
Peak 2	121.44	127.44	118.05	129.67	-229.72	23.09 (endothermic)
Peak 3	288.29	307.76	252.58	343.93	2979.97	-299.49 (exothermic)

Data of weight and weight loss of the DSC run in the second experiment

Sample weight [mg]	Total loss of mass of the sample (%)
10.08	69.6

Values of the DSC run in the second experiment

	Onset of effect (°C)	Endset of effect (°C)	Left Limit (°C)	Right Limit (°C)	Area (mJ)	Test item ΔH (J/g)
Peak 1	98.08	113.71	50.49	118.87	-7564.37	750.43 (endothermic)
Peak 2	120.16	126.44	118.91	128.34	-166.39	16.51 (endothermic)
Peak 3	280.43	303.94	251.82	343.82	3488.71	-346.10 (exothermic)

Conclusions:

The substance melts approx. at 96 - 127 °C.

Executive summary:

The thermal behaviour of test item was investigated using differential scanning calorimetry method, in accordance with OECD guidelines 102 and 113.

A small amount of test item was weighed into a one-way 40 µl aluminum crucible and sealed with closed aluminum lid using a capsule presser. Thus, prepared capsule was inserted into the furnace of the DSC device and heated from 25 to 500 °C with 10 °C/minutes heating rate. The experiment was performed in duplicate.

Before the test, the appearance of test item was red, clay; after the experiments the test item became black melts with bubbles in the melt.

During the heating two consecutive endothermic peaks were observed in the temperature range of approx. 96 ˗ 127 °C, which can be associated with melting of the test item. Afterwards, in the temperature range of approx. 252 ˗ 344 °C two contiguous exothermic decomposition reaction peaks were observed.

Conclusion

The substance melts approx. at 96 - 127 °C.

Description of key information

The substance melts approx. at 96 - 127 °C.

Additional information

OECD 102/113 - differential scanning calorimetry method