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Vapour pressure

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Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
2001
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Principles of method if other than guideline:
no information
Type of method:
other: no information
Temp.:
126.14 °C
Vapour pressure:
0.11 Pa
Temp.:
150.89 °C
Vapour pressure:
0.92 Pa
Conclusions:
vp reported as 0.11 - 0.92 Pa from 126.14 - 150.89 oC
Executive summary:

vp reported as 0.11 - 0.92 Pa from 126.14 - 150.89 oC

Endpoint:
vapour pressure
Type of information:
calculation (if not (Q)SAR)
Remarks:
estimated by calculation
Adequacy of study:
weight of evidence
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification
Remarks:
validity of model for vp of this substance is unknown, calculated vp (1.75e-03 Pa @ 25 oC) low, in line with extrapolated experimental results
Principles of method if other than guideline:
calculation
Type of method:
other: calculation
Temp.:
25 °C
Vapour pressure:
0.002 Pa
Remarks on result:
other: Mean VP of Antoine & Grain methods
Conclusions:
validity of model for vp of this substance is unknown, calculated vp is 0.00175 Pa @ 25 oC
Executive summary:

validity of model for vp of this substance is unknown, calculated vp is 0.00175 Pa @ 25 oC

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Qualifier:
no guideline followed
Principles of method if other than guideline:
static method with a membrane null manometer
Type of method:
static method
Remarks:
with a membrane null manometer
Temp.:
144.85 °C
Vapour pressure:
0.63 Pa
Remarks on result:
other: calc from vp equation
Remarks:
measurements for vp equation were taken from 418-533 K)
Temp.:
25 °C
Vapour pressure:
0 Pa
Remarks on result:
other: extrapolated (outside of measured range)
Remarks:
measured range was 144.85-259.85 oC
Transition / decomposition:
yes

It was established that the (C5H5)2TiCI2 evaporation processes under equilibrium conditions is accompanied by an appreciable decomposition of the substance, so that the observed vapour pressures must be corrected for the presence of gaseous decomposition products.

The experimental data for (C5H5)2TiCI2 were interpreted together with the results of low-temperature (418-479 K) fusion measurements , which agree fairly satisfactorily with our results. This made it possible to increase significantly the accuracy of the calculated characteristics of the sublimation of titanium dichlorodicyclopentadienylide. The standard enthalpies of formation of the gaseous compounds were determined: (C5H5)2TiCl2: logP = 13.22 ± 0.23 - (6500± 1l0)/T (418 - 533 K),

d H=-60 kcal/mol

Conclusions:
vp at 144.85 oC was 0.63 Pa, extrapolation of vp to 25 oC gives 3.5e-07 Pa
Executive summary:

vp at 144.85 oC was 0.63 Pa, extrapolation of vp to 25 oC gives 3.5e-07 Pa

Description of key information

Experimental vp at 25 oC (extrapolated from 144.85 -259.85 oC data) is 3.5e-07 Pa. Calculated vp at 25 oC (EpiSuite) is 1.75e-03 Pa, and that shall be used as worst case

Key value for chemical safety assessment

Vapour pressure:
0.002 Pa
at the temperature of:
25 °C

Additional information