return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Experimental > One molecule all properties

Experimental data for C2H5F (fluoroethane)

22 02 02 11 45
Other names
Ethyl fluoride; Ethane, fluoro-; Monofluoroethane; fluoroethane;
INChI INChIKey SMILES IUPAC name
InChI=1S/C2H5F/c1-2-3/h2H2,1H3 UHCBBWUQDAVSMS-UHFFFAOYSA-N CCF fluoroethane
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
Barrier to Internal Rotation 17.8   kJ mol-1 1955Kra/Dai:184 V3=1400 +- 50 cm-1
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' 3003   Shim      
2 A' 2941          
3 A' 2915          
4 A' 1479          
5 A' 1449          
6 A' 1395          
7 A' 1365          
8 A' 1108          
9 A' 1048          
10 A' 880          
11 A' 415          
12 A" 3003          
13 A" 3003          
14 A" 1449          
15 A" 1277          
16 A"             1048 questionable
17 A" 810          
18 A" 243          

vibrational zero-point energy: 13891.5 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for C2H5F (fluoroethane).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
1.20318 0.31237 0.27351 1955Kra/Dai:184

Calculated rotational constants for C2H5F (fluoroethane).
Product of moments of inertia moments of inertia
46603.17amu3Å6   2.13394601240203E-115gm3 cm6
Geometric Data
picture of fluoroethane

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
rCC 1.505 0.007 1 2 1976Hellwege(II/7) rs
rCF 1.398 0.007 1 3 1976Hellwege(II/7) rs
rCH 1.095 0.007 1 4 1976Hellwege(II/7) rs
rCH 1.090 0.007 2 7 1976Hellwege(II/7) rs
rCH 1.091 0.007 2 6 1976Hellwege(II/7) rs
aCCF 109.7 0.5 2 1 3 1976Hellwege(II/7) rs
aHCF 106.1 0.7 3 1 4 1976Hellwege(II/7) rs
aHCC 112.9 0.7 2 1 4 1976Hellwege(II/7) rs
aHCH 108.8 0.7 4 1 5 1976Hellwege(II/7) rs
aHCC 109.7 0.7 1 2 6 1976Hellwege(II/7) rs
aHCH 108.9 0.7 7 2 8 1976Hellwege(II/7) rs
aHCH 108.7 0.7 6 2 7 1976Hellwege(II/7) rs
aHCC 110.4 1 2 7 by symmetry
dHCCF 118.03 3 2 1 4 from symmetry
dHCCH 119.77 6 1 2 7 from symmetry

Cartesians
Atom x (Å) y (Å) z (Å)
C1 0.0000 0.5577 0.0000
C2 1.1298 -0.4366 0.0000
F3 -1.2233 -0.1190 0.0000
H4 -0.0067 1.1950 0.8904
H5 -0.0067 1.1950 -0.8904
H6 2.0845 0.0915 0.0000
H7 1.0799 -1.0684 0.8868
H8 1.0799 -1.0684 -0.8868

Atom - Atom Distances bond lengths
Distances in Å
  C1 C2 F3 H4 H5 H6 H7 H8
C1   1.50501.39801.09501.09502.13602.14402.1440
C2 1.5050   2.37442.17872.17871.09101.09001.0900
F3 1.39802.3744   1.99991.99993.31452.64432.6443
H4 1.09502.17871.9999   1.78082.52662.51073.0761
H5 1.09502.17871.99991.7808   2.52663.07612.5107
H6 2.13601.09103.31452.52662.5266   1.77231.7723
H7 2.14401.09002.64432.51073.07611.7723   1.7736
H8 2.14401.09002.64433.07612.51071.77231.7736  

Calculated geometries for C2H5F (fluoroethane).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle         atom1 atom2 atom3 angle
C1 C2 H6 109.700 C1 C2 H7 110.400
C1 C2 H8 110.400 C2 C1 F3 109.700
C2 C1 H4 112.900 C2 C1 H5 112.900
F3 C1 H4 106.045 F3 C1 H5 106.045
H4 C1 H5 108.806 H6 C2 H7 108.702
H6 C2 H8 108.702 H7 C2 H8 108.895

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
C-C 1
C-F 1
H-C 5

Connectivity
Atom 1 Atom 2
C1 C2
C1 F3
C1 H4
C1 H5
C2 H6
C2 H7
C2 H8
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
11.780       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 1.690 1.000   1.960 1955Kra/Dai:184 x is a, y is b 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 C2H5F (fluoroethane).
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 -2.000 1.300 0.700 1971Fly/Ben:225 Qxx=-2+-0.4, Qyy=1.3+-0.4, Qzz=0.7+-0.7 Cs 2 3

Calculated electric quadrupole moments for C2H5F (fluoroethane).
Electric dipole polarizability (Å3) polarizability
alpha unc. Reference
4.164 0.296 2015Tha/Wu:144302

Calculated electric dipole polarizability for C2H5F (fluoroethane).

References
By selecting the following links, you may be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to cccbdb@nist.gov.
squib reference DOI
1955Kra/Dai:184 J Kraitchman, BP Dailey "The Microwave Spectrum of Ethyl Fluoride" J. Chem. Phys. 23, 184, 1955 10.1063/1.1740525
1971Fly/Ben:225 WH Flygare, RC Benson "The molecular Zeeman effect in diamagnetic molecules and the determination of molecular magnetic moments (g values), magnetic susceptibilities, and molecular quadrupole moments" Mol. Phys. 1971, 20 (2), 225-250 10.1080/00268977100100221
1976Hellwege(II/7) Hellwege, KH and AM Hellwege (ed.). Landolt-Bornstein: Group II: Atomic and Molecular Physics Volume 7: Structure Data of Free Polyatomic Molecules. Springer-Verlag. Berlin. 1976.  
2015Tha/Wu:144302 AJ Thakkar, T Wu "How well do static electronic dipole polarizabilities from gas-phase experiments compare with density functional and MP2 computations?" J. Chem. Phys. 143, 144302 (2015) 10.1063/1.4932594
Shim Shimanouchi, T. , Tables of Molecular Vibrational Frequencies, Consolidated Volu 10.6028/NBS.NSRDS.39
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

Got a better number? Please email us at cccbdb@nist.gov


Browse
PreviousNext