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 CH3CF2CH3 (2,2-difluoropropane)

22 02 02 11 45
Other names
Propane, 2,​2-​difluoro-; HFC 272ca; R 272ca; Dimethyldifluoromethane;
INChI INChIKey SMILES IUPAC name
InChI=1S/C3H6F2/c1-3(2,4)5/h1-2H3 CC(F)(F)C
State Conformation
1A1 C2V
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 -543.00 13.00 kJ mol-1 webbook
Hfg(0K) enthalpy of formation   13.00 kJ mol-1 webbook
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 A1 3017   1981Dur/Gui:5946-5953       CH3 a-str
2 A1 2963           CH3 s-stretch
3 A1 1443           CH3 a-deform
4 A1 1396           CH3 s-deform
5 A1 1245           CF2 s-str
6 A1 908           CH3 rock
7 A1 779           CC s-stretch
8 A1 524           CF2 sciss
9 A1 333           CCC bend
10 A2 3015           CH3 a-str
11 A2 1452           CH3 a-deform
12 A2 994           CH3 rock
13 A2 354           CF2 twist
14 A2 255           CH3 torsion
15 B1 3017           B1 & B2 switched CH3 a-str
16 B1 1471           B1 & B2 switch CH3 a-deform
17 B1 1197           B1 & B2 switch CF2 a-str
18 B1 925           B1 & B2 switch CH3 rock
19 B1 517           B1 & B2 switch CF2 rock
20 B1 285           B1 & B2 switch CH3 torsion
21 B2 3017           B1 & B2 switch CH3 a-str
22 B2 2955           B1 & B2 switch CH3 s-stretch
23 B2 1464           B1 & B2 switch CH3 a-deform
24 B2 1390           B1 & B2 switch CH3 s-deform
25 B2 1266           B1 & B2 switch CC a-stretch
26 B2 987           B1 & B2 switch CH3 rock
27 B2 435           B1 & B2 switch CF2 wag

vibrational zero-point energy: 18802.0 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for CH3CF2CH3 (2,2-difluoropropane).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
0.17178 0.16145 0.16030 1981Dur/Gui:5946-5953 B0

Calculated rotational constants for CH3CF2CH3 (2,2-difluoropropane).
Product of moments of inertia moments of inertia
1077623amu3Å6   4.9344061159275E-114gm3 cm6
Geometric Data
picture of 2,2-difluoropropane

Point Group C2v


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

Cartesians
Atom x (Å) y (Å) z (Å)

Atom - Atom Distances bond lengths
Distances in Å
 

Calculated geometries for CH3CF2CH3 (2,2-difluoropropane).

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
C-C 2
C-F 2
H-C 6

Connectivity
Atom 1 Atom 2
C1 C2
C1 C3
C1 F4
C1 F5
C2 H6
C2 H8
C2 H9
C3 H7
C3 H10
C3 H11
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
11.420 0.020     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 1A1 C2v True     2.400 2.400 1981Dur/Gui:5946-5953 MW μ0 ±0.02 D C2v 1 2
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 CH3CF2CH3 (2,2-difluoropropane).
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 1A1 C2v True       C2v 1 2

Calculated electric quadrupole moments for CH3CF2CH3 (2,2-difluoropropane).

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 [email protected].
squib reference DOI
1981Dur/Gui:5946-5953 JR Durig, GA Guirgis, YS Li "Microwave, Raman, and far infrared spectra, barrier to internal rotation, and dipole moment of 2,2-difluoropropane" J. Chem. Phys. 74, 5946 (1981) 10.1063/1.441032
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

Got a better number? Please email us at [email protected]


Browse
PreviousNext