Ethane, 1,1-difluoro-

Formula: C₂H₄F₂
Molecular weight: 66.0500
IUPAC Standard InChI: InChI=1S/C2H4F2/c1-2(3)4/h2H,1H3
IUPAC Standard InChIKey: NPNPZTNLOVBDOC-UHFFFAOYSA-N
CAS Registry Number: 75-37-6
Chemical structure:
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Other names: Ethylidene fluoride; Algofrene Type 67; Freon 152a; FC 152a; Genetron 152a; R 152a; 1,1-Difluoroethane; CH3CHF2; Ethylidene difluoride; GENETRON 100; Propellant 152a; Halocarbon 152A; UN 1030; Dymel 152; Dymel 152A; HFC 152a
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Gas phase ion energetics data

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Data evaluated as indicated in comments:
L - Sharon G. Lias

Data compiled as indicated in comments:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

Quantity	Value	Units	Method	Reference	Comment
IE (evaluated)	11.865 ± 0.030	eV	N/A	N/A	L

Ionization energy determinations

IE (eV)	Method	Reference	Comment
11.865 ± 0.030	PI	Heinis, Bar, et al., 1985	LBLHLM
11.864 ± 0.029	PI	Heinis, Bar, et al., 1984	LBLHLM
12.68	EI	Lifshitz and Long, 1965	RDSH
12.8	PE	Sauvageau, Doucet, et al., 1974	Vertical value; LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
CHF₂⁺	12.808 ± 0.020	CH₃	PI	Heinis, Bar, et al., 1985	LBLHLM
CHF₂⁺	13.21	CH₃	EI	Lifshitz and Long, 1965	RDSH
CH₂F⁺	14.66 ± 0.04	CH₂F	PI	Heinis, Bar, et al., 1985	LBLHLM
CH₃⁺	14.25 ± 0.05	CHF₂	PI	Heinis, Bar, et al., 1985	LBLHLM
CH₃⁺	18.6	?	EI	Lifshitz and Long, 1965	RDSH
C₂H₂F⁺	≤14.67 ± 0.06	F^-+H₂	PI	Heinis, Bar, et al., 1985	LBLHLM
C₂H₂F⁺	15.52 ± 0.04	HF+H	PI	Heinis, Bar, et al., 1985	LBLHLM
C₂H₂F₂⁺	16.5	H₂	EI	Lifshitz and Long, 1965	RDSH
C₂H₃⁺	15.07 ± 0.05	F^-+HF	PI	Heinis, Bar, et al., 1985	LBLHLM
C₂H₃⁺	15.73 ± 0.05	F+HF	PI	Heinis, Bar, et al., 1985	LBLHLM
C₂H₃F⁺	13.40 ± 0.05	HF	PI	Heinis, Bar, et al., 1985	LBLHLM
C₂H₃F⁺	14.8	?	EI	Lifshitz and Long, 1965	RDSH
C₂H₃F₂⁺	12.203 ± 0.030	H	PI	Heinis, Bar, et al., 1985	LBLHLM
C₂H₃F₂⁺	12.203 ± 0.024	H	PI	Heinis, Bar, et al., 1984	LBLHLM
C₂H₃F₂⁺	12.18 ± 0.03	H	PI	Williamson, LeBreton, et al., 1976	LLK
C₂H₃F₂⁺	12.33	H	EI	Lifshitz and Long, 1965	RDSH
C₂H₄F⁺	13.6 ± 0.1	F	PI	Heinis, Bar, et al., 1985	LBLHLM
C₂H₄F⁺	11.87 ± 0.06	F^-	PI	Heinis, Bar, et al., 1985	LBLHLM
C₂H₄F⁺	14.8 ± 0.1	F	EI	Simmie and Tschuikow-Roux, 1971	LLK
C₂H₄F⁺	14.9	F	EI	Lifshitz and Long, 1965	RDSH

References

Go To: Top, Gas phase ion energetics data, Notes

Heinis, Bar, et al., 1985
Heinis, T.; Bar, R.; Borlin, K.; Jungen, M., Photoionization mass spectrometry of 1,1-difluoroethane, Chem. Phys., 1985, 94, 235. [all data]

Heinis, Bar, et al., 1984
Heinis, T.; Bar, R.; Borlin, K.; Jungen, M., Photoionization of 1,1-difluoroethane: The structure of the C₂H₃F₂⁺ ions, Chem. Phys. Lett., 1984, 105, 327. [all data]

Lifshitz and Long, 1965
Lifshitz, C.; Long, F.A., Appearance potentials and mass spectra of fluorinated ethylenes. II. Heats offormation of fluorinated species and their positive ions, J. Phys. Chem., 1965, 69, 3731. [all data]

Sauvageau, Doucet, et al., 1974
Sauvageau, P.; Doucet, J.; Gilbert, R.; Sandorfy, C., Vacuum ultraviolet and photoelectron spectra of fluoroethanes, J. Chem. Phys., 1974, 61, 391. [all data]

Williamson, LeBreton, et al., 1976
Williamson, A.D.; LeBreton, P.R.; Beauchamp, J.L., Photoionization mass spectrometry of 2-fluoropropane and 2,2-difluoropropane. A novel determination of the proton affinity of vinyl fluoride and 1,1-difluoroethylene, J. Am. Chem. Soc., 1976, 98, 2705. [all data]

Simmie and Tschuikow-Roux, 1971
Simmie, J.M.; Tschuikow-Roux, E., Mass spectrum, appearance potentials and bond dissociation energies of 1,1,1-trifluoroethane, Int. J. Mass Spectrom. Ion Phys., 1971, 7, 41. [all data]

Notes

Go To: Top, Gas phase ion energetics data, References

Symbols used in this document:

AE Appearance energy

IE (evaluated) Recommended ionization energy
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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AE	Appearance energy
IE (evaluated)	Recommended ionization energy