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Experimental data for CH3COCl (Acetyl Chloride)

22 02 02 11 45
Other names
Acetic acid chloride; Acetic chloride; Acetyl chloride; Ethanoyl chloride;
INChI INChIKey SMILES IUPAC name
InChI=1S/C2H3ClO/c1-2(3)4/h1H3 WETWJCDKMRHUPV-UHFFFAOYSA-N CC(Cl)=O Acetyl chloride
State Conformation
1A' CS
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Hfg(298.15K) enthalpy of formation -242.80   kJ mol-1 TRC
Hfg(0K) enthalpy of formation -233.80   kJ mol-1 TRC
Entropy (298.15K) entropy 295.21   J K-1 mol-1 TRC
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity     kJ mol-1  
Heat Capacity (298.15K) heat capacity 67.86   J K-1 mol-1 TRC
Information can also be found for this species in the NIST Chemistry Webbook
Vibrational levels (cm-1) vibrations
Mode Number Symmetry Frequency Intensity Comment Description
Fundamental(cm-1) Harmonic(cm-1) Reference (km mol-1) unc. Reference
1 A' 3027   1994Dur/Dav:189      
2 A' 2948   1994Dur/Dav:189      
3 A' 1818   1994Dur/Dav:189      
4 A' 1415   1994Dur/Dav:189      
5 A' 1368   1994Dur/Dav:189      
6 A' 1108   1994Dur/Dav:189      
7 A' 956   1994Dur/Dav:189      
8 A' 604   1994Dur/Dav:189      
9 A' 445   1994Dur/Dav:189      
10 A' 348   1994Dur/Dav:189      
11 A" 2990   1994Dur/Dav:189      
12 A" 1431   1994Dur/Dav:189      
13 A" 1032   1994Dur/Dav:189      
14 A" 518   1994Dur/Dav:189      
15 A" 166   1994Dur/Dav:189      

vibrational zero-point energy: 10087.0 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for CH3COCl (Acetyl Chloride).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
0.33898 0.16500 0.11318 1994Dur/Dav:189

Calculated rotational constants for CH3COCl (Acetyl Chloride).
Product of moments of inertia moments of inertia
756744.3amu3Å6   3.465110731911E-114gm3 cm6
Geometric Data
picture of Acetyl Chloride

Point Group Cs


Internal coordinates
distances (r) in Å, angles (a) in degrees, dihedrals (d) in degrees
Description Value unc. Connectivity Reference Comment
Atom 1 Atom 2 Atom 3 Atom 4
rCO 1.187   1 3 1998Kuc rg
rCCl 1.798   1 4 1998Kuc rg
rCC 1.506   1 2 1998Kuc rg
rCH 1.105   2 5 1998Kuc rg
aOCCl 121.2 3 1 4 1998Kuc
aCCCl 111.6 2 1 4 1998Kuc
aHCH 108.6 5 2 6 1998Kuc

Cartesians
Atom x (Å) y (Å) z (Å)
C1 0.0000 0.5272 0.0000
C2 1.4961 0.6994 0.0000
O3 -0.8349 1.3710 0.0000
Cl4 -0.4665 -1.2092 0.0000
H5 1.7591 1.7726 0.0000
H6 1.9367 0.2285 0.8973
H7 1.9367 0.2285 -0.8973

Atom - Atom Distances bond lengths
Distances in Å
  C1 C2 O3 Cl4 H5 H6 H7
C1   1.50601.18701.79802.15532.15532.1553
C2 1.5060   2.42592.73761.10501.10501.1050
O3 1.18702.4259   2.60632.62493.12933.1293
Cl4 1.79802.73762.6063   3.72082.94072.9407
H5 2.15531.10502.62493.7208   1.79471.7947
H6 2.15531.10503.12932.94071.7947   1.7947
H7 2.15531.10503.12932.94071.79471.7947  

Calculated geometries for CH3COCl (Acetyl Chloride).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle         atom1 atom2 atom3 angle
C1 C2 H5 110.330 C1 C2 H6 110.330
C1 C2 H7 110.330 C2 C1 O3 128.136
C2 C1 Cl4 111.600 O3 C1 Cl4 120.264
H5 C2 H6 108.599 H5 C2 H7 108.599
H6 C2 H7 108.599

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-C 3
C-C 1
C=O 1
C-Cl 1

Connectivity
Atom 1 Atom 2
C1 C2
C1 O3
C1 Cl4
C2 H5
C2 H6
C2 H7
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   1A'

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
10.820 0.040 11.030   webbook
Dipole, Quadrupole and Polarizability
Electric dipole moment dipole
State Config State description Conf description Exp. min. Dipole (Debye) Reference comment Point Group Components
x y z total dipole quadrupole
1 1 1A' Cs True       2.720 NSRDS-NBS10 DT Cs 2 3
Experimental dipole measurement abbreviations: MW microwave; DT Dielectric with Temperature variation; DR Indirect (usually an upper limit); MB Molecular beam
Calculated electric dipole moments for CH3COCl (Acetyl Chloride).
Electric quadrupole moment quadrupole
State Config State description Conf description Exp. min. Quadrupole (D Å) Reference comment Point Group Components
xx yy zz dipole quadrupole
1 1 1A' Cs True       Cs 2 3

Calculated electric quadrupole moments for CH3COCl (Acetyl Chloride).

References
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squib reference DOI
1994Dur/Dav:189 JR Durig, JF Davis, GA Guirgis "Raman and Far Infrared Spectra, Structural Parameters, and Ab Initio Calculations on Acetyl Chloride" Journal of Raman Spectroscopy Vol 25, 189-198 (1994) 10.1002/jrs.1250250208
1998Kuc K Kuchitsu(ed) "Structure of Free Polyatomic Molecules - Basic Data" Springer, Berlin, 1998 10.1007/978-3-642-45748-7 
NSRDS-NBS10 R. D. Nelson Jr., D. R. Lide, A. A. Maryott "Selected Values of electric dipole moments for molecules in the gas phase" NSRDS-NBS10, 1967 10.6028/NBS.NSRDS.10
TRC Frenkel, M; Marsh, K.N.; Wilhoit, R.C.; Kabo, G.J.; Roganov, G.N.,Thermodynamics of Organic Compounds in the Gas State,Thermodynamics Research Center, College Station, TX, 1994  
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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