Diphosphine

Formula: H₄P₂
Molecular weight: 65.97928
IUPAC Standard InChI: InChI=1S/H4P2/c1-2/h1-2H2
IUPAC Standard InChIKey: VURFVHCLMJOLKN-UHFFFAOYSA-N
CAS Registry Number: 13445-50-6
Chemical structure:
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Information on this page:
Other data available:
- Reaction thermochemistry data
Data at other public NIST sites:
- Gas Phase Kinetics Database
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Gas phase ion energetics data

Data compiled as indicated in comments:
B - John E. Bartmess
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to H₄P₂⁺ (ion structure unspecified)

Ionization energy determinations

IE (eV)	Method	Reference	Comment
8.8	PE	Elbel, Dieck, et al., 1976	LLK
9.17 ± 0.05	EI	Fehlner and Callen, 1968	RDSH
8.7 ± 0.3	EI	Wada and Kiser, 1964	RDSH
10.6 ± 0.3	EI	Saalfeld and Svec, 1963	RDSH
9.69	PE	Elbel, Dieck, et al., 1976	Vertical value; LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
PH⁺	17.4 ± 0.5	?	EI	Fehlner and Callen, 1968	RDSH
P₂H⁺	14.6 ± 0.3	?	EI	Fehlner and Callen, 1968	RDSH
P₂H⁺	13.2	?	EI	Wada and Kiser, 1964	RDSH
P₂H⁺	13.6 ± 0.3	?	EI	Saalfeld and Svec, 1963	RDSH
PH₂⁺	15.3 ± 0.5	?	EI	Fehlner and Callen, 1968	RDSH
PH₂⁺	12.5 ± 0.2	?	EI	Saalfeld and Svec, 1964	RDSH
P₂H₂⁺	11.1 ± 0.2	H₂	EI	Fehlner and Callen, 1968	RDSH
P₂H₂⁺	10.5	H₂	EI	Wada and Kiser, 1964	RDSH
P₂H₂⁺	12.7 ± 0.3	H₂	EI	Saalfeld and Svec, 1963	RDSH
P₂H₃⁺	12.2 ± 0.2	H	EI	Fehlner and Callen, 1968	RDSH
P₂H₃⁺	11.3 ± 0.3	H	EI	Saalfeld and Svec, 1963	RDSH
P⁺	19.4 ± 0.5	?	EI	Fehlner and Callen, 1968	RDSH
P⁺	16.7 ± 0.3	?	EI	Saalfeld and Svec, 1963	RDSH
P₂⁺	13.2 ± 0.2	?	EI	Fehlner and Callen, 1968	RDSH
P₂⁺	12.2	?	EI	Wada and Kiser, 1964	RDSH
P₂⁺	13.7 ± 0.3	?	EI	Saalfeld and Svec, 1963	RDSH

De-protonation reactions

H₃P₂^- + = Diphosphine

By formula: H₃P₂^- + H⁺ = H₄P₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	<1574.9	kJ/mol	Acid	Smyth and Brauman, 1972	gas phase; PH₂^- + PH₃ ->.; B

References

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

Elbel, Dieck, et al., 1976
Elbel, S.; Dieck, H.t.; Becker, G.; Ensslin, W., Photoelectron spectra of group 5 compounds. II. Conformational analysis of diphosphine (P₂H₄), Inorg. Chem., 1976, 15, 1235. [all data]

Fehlner and Callen, 1968
Fehlner, T.P.; Callen, R.B., Mass spectrometry of phosphorus hydrides, Advan. Chem. Ser., 1968, 72, 181. [all data]

Wada and Kiser, 1964
Wada, Y.; Kiser, R.W., Mass spectrometric study of phosphine and diphosphine, Inorg. Chem., 1964, 3, 174. [all data]

Saalfeld and Svec, 1963
Saalfeld, F.E.; Svec, H.J., The mass spectra of volatile hydrides. II. Some higher hydrides of the group IVB and VB elements, Inorg. Chem., 1963, 2, 50. [all data]

Saalfeld and Svec, 1964
Saalfeld, F.E.; Svec, H.J., Mass spectra of volatile hydrides. III. Silylphosphine, Inorg. Chem., 1964, 3, 1442. [all data]

Smyth and Brauman, 1972
Smyth, K.C.; Brauman, J.I., Photodetachment of electrons from phosphide ion the electron affinity of PH₂^-, J. Chem. Phys., 1972, 56, 1132. [all data]

Notes

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

Symbols used in this document:

AE Appearance energy

Δ_rH° Enthalpy of reaction at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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AE	Appearance energy
Δ_rH°	Enthalpy of reaction at standard conditions