Acetonitrile (data page)

Chemical data page From Wikipedia, the free encyclopedia

This page provides supplementary chemical data on acetonitrile.

Material Safety Data Sheet

The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source and follow its directions.

Structure and properties

More information Structure and properties ...
Structure and properties
Dielectric constant, εr 36.64 ε0 at 20 °C [1]
Surface tension[2] 29.29 dyn/cm
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Thermodynamic properties

More information Phase behavior, Solid properties ...
Phase behavior
Triple point[3] 229.32 K (−43.83 °C), 167 Pa
Std entropy change
of fusion, ΔfusSo		 35.61 J/(mol·K) (crystal I → liq)
Std entropy change
of vaporization, ΔvapSo		 111.44 J/(mol·K) at 25 °C
Solid properties
Heat capacity, cp 92.36 J/(mol K)at 298.15 K
Std enthalpy change
of state transition, ΔtrsHo		 0.8979 kJ/mol at −56.2 °C
(crystal II → crystal I)
Std entropy change
of state transition, ΔtrsSo		 4.14 J/(mol·K) at −56.2 °C
(crystal II → crystal I)
Liquid properties
Std enthalpy change
of formation, ΔfHoliquid		 −40.56 kJ/mol
Standard molar entropy,
Soliquid		 149.62 J/(mol K)
Enthalpy of combustion, ΔcHo −1256.33 kJ/mol
Heat capacity, cp 91.7 J/(mol K) at 25 °C
Gas properties
Std enthalpy change
of formation, ΔfHogas		 −74.04 kJ/mol
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Vapor pressure of liquid

P in mm Hg11040100400760
T in °C−47.0(s)−16.37.727.062.581.8

Table data obtained from CRC Handbook of Chemistry and Physics, 44th ed. The "(s)" notation indicates temperature of solid/vapor equilibrium. Otherwise the data is temperature of liquid/vapor equilibrium.

log10 of Acetonitrile vapor pressure. Uses formula obtained from CHERIC[2]

Distillation data

More information BPTemp. °C, % by mole acetonitrile ...
Vapor-liquid Equilibrium for Acetonitrile/Water[4]
P = 760 mmHg
BP
Temp.
°C		 % by mole acetonitrile
liquidvapor
86.52.926.3
81.19.350.5
80.014.255.9
78.625.461.7
77.440.265.5
76.750.766.4
76.652.767.3
76.071.872.8
76.683.978.0
76.885.676.1
80.498.694.5
    
Vapor-liquid Equilibrium for Acetonitrile/Methanol[4]
P = 760 mmHg
BP
Temp.
°C		 % by mole methanol
liquidvapor
79.202.59.5
77.954.013.5
76.775.517.5
75.129.726.5
73.1214.033.0
72.0717.037.5
70.9620.0420
68.8524.745.5
68.3928.950.5
66.0041.559.5
65.3547.062.5
64.7554.565.5
64.3463.071.5
64.0369.074.5
63.8074.578.9
63.7782.582.5
63.7686.086.0
63.8790.088.0
64.0593.091.5
64.1895.093.0
64.4097.095.5
    
Vapor-liquid Equilibrium for Acetonitrile/Benzene[4]
P = 760 mmHg
BP
Temp.
°C		 % by mole benzene
liquidvapor
80.62.04.8
80.42.76.2
79.05.612.5
78.56.514.7
78.07.716.5
76.017.629.3
74.924.235.5
74.429.939.3
73.837.143.8
73.738.044.9
73.444.048.5
73.251.351.9
73.052.9452.94
73.258.154.5
73.466.560.0
73.871.362.6
74.076.765.7
74.479.068.0
76.392.080.1
    
Vapor-liquid Equilibrium for Acetonitrile/Toluene[4]
P = 760 mmHg
BP
Temp.
°C		 % by mole toluene
liquidvapor
81.53.35.1
81.46.98.1
81.112.1812.18
81.318.215.4
81.422.117.2
81.828.419.5
82.737.523.0
84.453.328.4
85.660.531.5
91.178.541.7
93.484.047.3
95.687.652.6
101.292.966.5
103.695.673.8
106.797.783.6
107.598.285.4
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Spectral data

More information UV-Vis, IR ...
UV-Vis
λmax ? nm
Extinction coefficient, ε ?
IR
Major absorption bands[5]
(liquid film)
Wave numbertransmittance
3675 cm−179%
3544 cm−181%
3202 cm−177%
3164 cm−160%
3003 cm−152%
2944 cm−152%
2629 cm−181%
2410 cm−181%
2293 cm−144%
2254 cm−14%
1445 cm−130%
1378 cm−125%
1181 cm−184%
1040 cm−143%
918 cm−147%
750 cm−170%
NMR
Proton NMR  
Carbon-13 NMR  
Other NMR data  
MS
Masses of
main fragments		  
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References

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