1,3,3-trimethyl-2-[[methyl(p-tolyl)hydrazono]methyl]-3H-indolium methyl sulphate

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2012-10-15 to 2013-01-09

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Report date:

2013

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

no

GLP compliance:

no

Type of method:

effusion method: vapour pressure balance

Test material

Test material information

Constituent 1

Reference substance name:

2-[[(4-methoxyphenyl)methylhydrazono]methyl]-1,3,3-trimethyl-3H-indolium methyl sulphate

EC Number:

258-946-7

EC Name:

2-[[(4-methoxyphenyl)methylhydrazono]methyl]-1,3,3-trimethyl-3H-indolium methyl sulphate

Cas Number:

54060-92-3

Molecular formula:

C20H24N3O.CH3O4S C21H27N3O5S

IUPAC Name:

2-{[2-(4-methoxyphenyl)-2-methylhydrazin-1-ylidene]methyl}-1,3,3-trimethyl-3H-indol-1-ium methyl sulfate

Test material form:

solid

Results and discussion

Vapour pressure

Vapour pressure 1

Temp.:

20 °C

Vapour pressure:

0 hPa

Remarks on result:

other: The vapour pressure value for the test item was extrapolated from the experimental data

Vapour pressure 2

Temp.:

25 °C

Vapour pressure:

0 hPa

Remarks on result:

other: The vapour pressure value for the test item was extrapolated from the experimental data

Vapour pressure 3

Temp.:

50 °C

Vapour pressure:

0 hPa

Remarks on result:

other: The vapour pressure value for the test item was extrapolated from the experimental data

Any other information on results incl. tables

The vapour pressure was measured in the temperature range of 25 °C to 99 °C. Above 58 °C a vapour pressure could be measured. The measured vapour pressures at the corresponding temperatures are listed in Table 1.

Table l: measured vapour pressures and corresponding temperatures

Temperature / °C                                          Vapour pressure / hPa

57.5                                                               1.76 x 10 ^-05

63.4                                                               3.19 x 10^-05

72.0                                                               1.01 x 10^-04

76.1                                                               1.59 x 10^-04

81.1                                                               2.67 x 10^-04

86.0                                                               3.91 x 10^-04

90.1                                                               5.40 x 10^-04

95.8                                                               8.42 x 10^-04

98.8                                                               1.04 x 10^-03

The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C

A= 11.45989

B= -5349.40

C= 273.15

Table 2: The extrapolated vapour pressure values of the test item:

T (°C)	p (hPa)	p (Pa)
20	1.63 x 10^-07	1.63 x ^10-05
25	3.30 x 10^-07	3.30 x ^10-05
50	8.05 x 10^-06	8.05 x ^10-04

Applicant's summary and conclusion

Conclusions:

In conclusion, at 20 °C the vapour pressure is 1.63 x 10-7, at 25 °C it is 3.3 x 10-7 and at 50 °C it is 8.05 x 10-6 hPa.

Executive summary:

A study was performed according to EU method A.4 (OECD guideline 104) to measure the vapour pressure of the test item. The vapour pressure was measured in the temperature range of 25 °C to 99 °C. Above 58 °C a vapour pressure could be measured. The final results were presented as extrapolated vapour pressure values at three different temperatures. At 20 °C the vapour pressure is 1.63 x 10^-7, at 25 °C it is 3.3 x 10^-7 and at 50 °C it is 8.05 x 10^-6 hPa.