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Experimental data for CHF2CHF2 (1,1,2,2-tetrafluoroethane)

22 02 02 11 45
Other names
Ethane, 1,1,2,2-tetrafluoro-; Freon 134; R 134;
INChI INChIKey SMILES IUPAC name
InChI=1S/C2H2F4/c3-1(4)2(5)6/h1-2H WXGNWUVNYMJENI-UHFFFAOYSA-N FC(F)C(F)F
State Conformation
1AG C2H
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
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 Ag 3004   2000Cra/Chu:10092-10103      
2 Ag 1443          
3 Ag 1145          
4 Ag 1097          
5 Ag 623          
6 Ag 361          
7 Au 1331          
8 Au 1144          
9 Au 210          
10 Au 82          
11 Bg 1362          
12 Bg 1083          
13 Bg 479          
14 Bu 2995          
15 Bu 1309          
16 Bu 1127          
17 Bu 542          
18 Bu 413          

vibrational zero-point energy: 9875.4 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for CHF2CHF2 (1,1,2,2-tetrafluoroethane).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
0.17129 0.10502 0.06896 2001Cra/Oer:6008-6019

Calculated rotational constants for CHF2CHF2 (1,1,2,2-tetrafluoroethane).
Product of moments of inertia moments of inertia
3861834amu3Å6   1.7683228609905E-113gm3 cm6
Geometric Data
picture of 1,1,2,2-tetrafluoroethane

Point Group C2h


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
rCH 1.087 0.005 1 3 2001Cra/Oer:6008-6019
rCC 1.511 0.004 1 2 2001Cra/Oer:6008-6019
rCF 1.359 0.007 1 5 2001Cra/Oer:6008-6019
aCCH 112.9 0.3 1 2 4 2001Cra/Oer:6008-6019
aCCF 108.5 0.6 1 2 7 2001Cra/Oer:6008-6019
aFCF 107.4 0.6 5 1 6 2001Cra/Oer:6008-6019
dFCCF 63.6 1.2 5 1 2 6 2001Cra/Oer:6008-6019

Cartesians
Atom x (Å) y (Å) z (Å)
C1 0.6739 0.0000 -0.3412
C2 -0.6739 0.0000 0.3412
H3 0.5985 0.0000 -1.4258
H4 -0.5985 0.0000 1.4258
F5 1.3653 1.0953 0.0697
F6 1.3653 -1.0953 0.0697
F7 -1.3653 1.0953 -0.0697
F8 -1.3653 -1.0953 -0.0697

Atom - Atom Distances bond lengths
Distances in Å
  C1 C2 H3 H4 F5 F6 F7 F8
C1   1.51071.08712.17751.35891.35892.33062.3306
C2 1.5107   2.17751.08712.33062.33061.35891.3589
H3 1.08712.1775   3.09262.00602.00602.62592.6259
H4 2.17751.08713.0926   2.62592.62592.00602.0060
F5 1.35892.33062.00602.6259   2.19072.73413.5035
F6 1.35892.33062.00602.62592.1907   3.50352.7341
F7 2.33061.35892.62592.00602.73413.5035   2.1907
F8 2.33061.35892.62592.00603.50352.73412.1907  

Calculated geometries for CHF2CHF2 (1,1,2,2-tetrafluoroethane).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle         atom1 atom2 atom3 angle
C1 C2 H4 112.880 C1 C2 F7 108.500
C1 C2 F8 108.500 C2 C1 H3 112.880
C2 C1 F5 108.500 C2 C1 F6 108.500
H3 C1 F5 109.690 H3 C1 F6 109.690
H4 C2 F7 109.690 H4 C2 F8 109.690
F5 C1 F6 107.424 F7 C2 F8 107.424

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
H-C 2
C-F 4

Connectivity
Atom 1 Atom 2
C1 C2
C1 H3
C1 F5
C1 F6
C2 H4
C2 F7
C2 F8
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   1AG
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 1AG C2h True       0.000   symmetry C2h 0 3
1 2 1A C2     2.454 2.454 2000Mat/Wal:9489-9493 ± 0.002 D MW μ0 C2 1 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 CHF2CHF2 (1,1,2,2-tetrafluoroethane).
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 1AG C2h True       C2h 0 3
1 2 1A C2       C2 1 3

Calculated electric quadrupole moments for CHF2CHF2 (1,1,2,2-tetrafluoroethane).

References
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squib reference DOI
2000Cra/Chu:10092-10103 NC Craig, JI Chuang, CC Nwofor, CM Oertel "Synthesis and Vibrational Spectroscopy of 1,1,2,2-Tetrafluoroethane and Its 13C2 and d2 Isotopomers" J. Phys. Chem. A 2000, 104, 10092-10103 10.1021/jp0004967
2000Mat/Wal:9489-9493 B Mate, AH Walker, RD Suenram, NC Craig "Complete Structure of Gauche 1,1,2,2-Tetrafluoroethane Determined by Microwave Spectroscopy" J. Phys. Chem. A 2000, 104, 9489-9493 10.1021/jp001913i
2001Cra/Oer:6008-6019 NC Craig, CM Oertel, DC Oertel, M Lock "Complete Structure of anti-1,1,2,2-Tetrafluoroethane by High-Resolution Infrared Spectroscopy" J. Phys. Chem. A 2001, 105, 6008-6019 10.1021/jp010539z

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