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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP compliant, guideline study ,available as an unpublished report. reliable without restrictions
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to
Guideline:
other: OECD 113 (1981) Screening test for thermal stability and stability in air
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: vapour pressure balance
Temp.:
40 °C
Vapour pressure:
0 hPa
Temp.:
60 °C
Vapour pressure:
0 hPa
Temp.:
79 °C
Vapour pressure:
0 hPa
Temp.:
90 °C
Vapour pressure:
0 hPa
Temp.:
99 °C
Vapour pressure:
0 hPa
Temp.:
109 °C
Vapour pressure:
0 hPa
Temp.:
114 °C
Vapour pressure:
0 hPa
Key result
Temp.:
20 °C
Vapour pressure:
< 0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
< 0 Pa
Key result
Temp.:
50 °C
Vapour pressure:
< 0 Pa

The results at 20, 25 and 50 °C are conservative estimations.

Thermal stability:

 Weight (mg)  Final temperature (°C)  Type of effect  Temperature Range (°C)  Enthalpy (J/g)  Crucible
 10.00  300 exothermal 140 - 185 -29n.r-89 Closed glass crucible
 10.00  300  endothermal  185 - 215  n.r.  Closed glass crucible
 10.00  300  exothermal  265 - 300  -89  Closed glass crucible

n.r. = not relevent

Measured vapour pressures and corresponding temperatures (continued from results section):

 Temperature (°C) Vapour pressure (hPa) 
 120  2.1 x 10 -5
Conclusions:
Based on the measured vapour pressure at 120 °C, the following upper limit vapour pressure values were calculated; <9.8 x10-8 Pa at 20°C. <1.9 x10-7 Pa at 25 °C and <3.8 x10-6 Pa at 50°C.
Executive summary:

The vapour pressure and thermal stability of carbonyl(pentane-2,4 -dionato-O,O')(triphenylphosphine)rhodium were assessed by the effusion method following the OECD 104 (2006), OECD 113 (1981) and EC No. 440/2008 and No. 761/2009 A.4. The study is a GLP compliant, guideline study and is therefore reliable without restrictions. 

Measured vapour pressure in the temperature range 70 - 109 °C were below the lower detection limit of vapour pressure balance of 10-5hPa. The measured vapour pressure at 114 °C and 120 °C were only slightly above the detection limit of the method.

Based on the measured vapour pressure at 120 °C, the following upper limit vapour pressure values were calculated; <9.8 x10-8 Pa at 20°C. <1.9 x10-7 Pa at 25 °C and <3.8 x10-6 Pa at 50°C.

Description of key information

Based on the measured vapour pressure at 120 °C, the following upper limit vapour pressure values were calculated; <9.8 x10-8 Pa at 20°C. <1.9 x10-7 Pa at 25 °C and <3.8 x10-6 Pa at 50°C.  
    
    
    

Key value for chemical safety assessment

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

Additional information

The vapour pressure and thermal stability of carbonyl(pentane-2,4 -dionato-O,O')(triphenylphosphine)rhodium were assessed by the effusion method following standard test guidelines (Nau 2015). The study is a GLP compliant, guideline study and is therefore reliable without restrictions. 

Measured vapour pressure in the temperature range 70 - 109 °C were below the lower detection limit of vapour pressure balance of 10-5hPa. The measured vapour pressure at 114 °C and 120 °C were only slightly above the detection limit of the method.

Based on the measured vapour pressure at 120 °C, the following upper limit vapour pressure values were calculated; <9.8 x10-8 Pa at 20°C. <1.9 x10-7 Pa at 25 °C and <3.8 x10-6 Pa at 50°C.