A-weighting

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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

Structure and properties
Index of refraction, nD 1.3460 at 16.5°C
Abbe number ?
Dielectric constant, εr 37.5 ε0 at 20 °C
Dipole Moment, 3.84 D
Bond strength ?
Bond length ?
Bond angle ?
Magnetic susceptibility ?
Viscosity[1] 0.441 mPa·s at 0°C
0.343 mPa·s at 25°C
Surface tension[1] 29.29 dyn/cm

Thermodynamic properties

Phase behavior
Triple point[2] 229.32 K (–43.83 °C), 167 Pa
Critical point 545 K (272 °C), 4.87 MPa
Std enthalpy change
of fusion, ΔfusHo 		8.167 kJ/mol (crystal I → liq)
Std entropy change
of fusion, ΔfusSo 		35.61 J/(mol·K) (crystal I → liq)
Std enthalpy change
of vaporization, ΔvapHo 		33.225 kJ/mol at 25°C
29.75 at 81.6°C (BP)
Std entropy change
of vaporization, ΔvapSo 		111.44 J/(mol·K) at 25°C
Solid properties
Std enthalpy change
of formation, ΔfHosolid 		? kJ/mol at 25°C
Standard molar entropy,
Sosolid 		? J/(mol K)
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°
(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
Standard molar entropy,
Sogas 		? J/(mol K)
Heat capacity, cp ? J/(mol K)

Vapor pressure of liquid

P in mm Hg 1 10 40 100 400 760
T in °C –47.0(s) –16.3 7.7 27.0 62.5 81.8

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 logePmmHg=loge(760101.325)−3.881710loge(T+273.15)−4999.618T+273.15+41.05901+3.515956×10−06(T+273.15)2 obtained from CHERIC[1]

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Distillation data

Vapor-liquid Equilibrium for Acetonitrile/Water[3]
P = 760 mmHg
BP
Temp.
°C 		% by mole acetonitrile
liquid vapor
86.5 2.9 26.3
81.1 9.3 50.5
80.0 14.2 55.9
78.6 25.4 61.7
77.4 40.2 65.5
76.7 50.7 66.4
76.6 52.7 67.3
76.0 71.8 72.8
76.6 83.9 78.0
76.8 85.6 76.1
80.4 98.6 94.5
   
Vapor-liquid Equilibrium for Acetonitrile/Methanol[3]
P = 760 mmHg
BP
Temp.
°C 		% by mole methanol
liquid vapor
79.20 2.5 9.5
77.95 4.0 13.5
76.77 5.5 17.5
75.12 9.7 26.5
73.12 14.0 33.0
72.07 17.0 37.5
70.96 20.0 420
68.85 24.7 45.5
68.39 28.9 50.5
66.00 41.5 59.5
65.35 47.0 62.5
64.75 54.5 65.5
64.34 63.0 71.5
64.03 69.0 74.5
63.80 74.5 78.9
63.77 82.5 82.5
63.76 86.0 86.0
63.87 90.0 88.0
64.05 93.0 91.5
64.18 95.0 93.0
64.40 97.0 95.5
   
Vapor-liquid Equilibrium for Acetonitrile/Benzene[3]
P = 760 mmHg
BP
Temp.
°C 		% by mole benzene
liquid vapor
80.6 2.0 4.8
80.4 2.7 6.2
79.0 5.6 12.5
78.5 6.5 14.7
78.0 7.7 16.5
76.0 17.6 29.3
74.9 24.2 35.5
74.4 29.9 39.3
73.8 37.1 43.8
73.7 38.0 44.9
73.4 44.0 48.5
73.2 51.3 51.9
73.0 52.94 52.94
73.2 58.1 54.5
73.4 66.5 60.0
73.8 71.3 62.6
74.0 76.7 65.7
74.4 79.0 68.0
76.3 92.0 80.1
   
Vapor-liquid Equilibrium for Acetonitrile/Toluene[3]
P = 760 mmHg
BP
Temp.
°C 		% by mole toluene
liquid vapor
81.5 3.3 5.1
81.4 6.9 8.1
81.1 12.18 12.18
81.3 18.2 15.4
81.4 22.1 17.2
81.8 28.4 19.5
82.7 37.5 23.0
84.4 53.3 28.4
85.6 60.5 31.5
91.1 78.5 41.7
93.4 84.0 47.3
95.6 87.6 52.6
101.2 92.9 66.5
103.6 95.6 73.8
106.7 97.7 83.6
107.5 98.2 85.4

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Spectral data

UV-Vis
λmax ? nm
Extinction coefficient, ε ?
IR
Major absorption bands[4]
(liquid film)
Wave number transmittance
3675 cm−1 79%
3544 cm−1 81%
3202 cm−1 77%
3164 cm−1 60%
3003 cm−1 52%
2944 cm−1 52%
2629 cm−1 81%
2410 cm−1 81%
2293 cm−1 44%
2254 cm−1 4%
1445 cm−1 30%
1378 cm−1 25%
1181 cm−1 84%
1040 cm−1 43%
918 cm−1 47%
750 cm−1 70%
NMR
Proton NMR  
Carbon-13 NMR  
Other NMR data  
MS
Masses of
main fragments 		 

References

  1. ↑ 1.0 1.1 1.2 Template:Cite web
  2. ↑ Vapor Pressures of Acetonitrile Determined by Comparative Ebulliometry, Michael B. Ewing* and Jesus C. Sanchez Ochoa, Journal of Chemical & Engineering Data 2004 49 (3), 486-491
  3. ↑ 3.0 3.1 3.2 3.3 Template:Cite web
  4. ↑ Template:Cite web

Except where noted otherwise, data relate to standard ambient temperature and pressure.

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