(E)-Diazene

Formula: H₂N₂
Molecular weight: 30.0293
IUPAC Standard InChI: InChI=1S/H2N2/c1-2/h1-2H/b2-1+
IUPAC Standard InChIKey: RAABOESOVLLHRU-OWOJBTEDSA-N
CAS Registry Number: 15626-43-4
Chemical structure:
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Gas phase ion energetics data

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Data compiled as indicated in comments:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi

View reactions leading to H₂N₂⁺ (ion structure unspecified)

Ionization energy determinations

IE (eV)	Method	Reference	Comment
9.65 ± 0.08	EI	Foner and Hudson, 1978	LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
HN₂⁺	10.89 ± 0.08	H	EI	Foner and Hudson, 1978, 2	LLK

Vibrational and/or electronic energy levels

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Data compiled by: Marilyn E. Jacox

State: C

Energy (cm^-1)	Med.	Transition	λ_min (nm)	λ_max (nm)	References


T_o = 67894	gas	C-X	135	147	Neudorfl, Back, et al., 1981

Vib. sym.	No.	Approximate type of mode	cm^-1	Med.	Method	References


a_g	2	Bend	1180	gas	AB	Neudorfl, Back, et al., 1981
	3	NN stretch	1849	gas	AB	Neudorfl, Back, et al., 1981

State: B

Energy (cm^-1)	Med.	Transition	λ_min (nm)	λ_max (nm)	References


T_o = 57926.5	gas	B-X	150	175	Trombetti, 1968
					Neudorfl, Back, et al., 1981

Vib. sym.	No.	Approximate type of mode	cm^-1	Med.	Method	References


a_g	1	NH stretch	3092	gas	AB	Neudorfl, Back, et al., 1981
	2	Bend	1180	gas	AB	Trombetti, 1968 Neudorfl, Back, et al., 1981
	3	NN stretch	1875	gas	AB	Trombetti, 1968 Neudorfl, Back, et al., 1981

State: A

Med.	Transition	λ_min (nm)	λ_max (nm)	References


gas	A-X	300	440	Willis and Back, 1973
				Back, Willis, et al., 1974
				Back, Willis, et al., 1978

Vib. sym.	No.	Approximate type of mode	cm^-1	Med.	Method	References


a_g	2	Bend	1215 ± 15	gas	AB	Back, Willis, et al., 1974
	3	NN stretch	1550 ± 20	gas	AB	Back, Willis, et al., 1974

State: X

Vib. sym.	No.	Approximate type of mode	cm^-1	Med.	Method	References


a_g	1	NH stretch	3128	N₂	Ra	Bondybey and Nibler, 1973
	2	NH bend	1583	N₂	Ra	Bondybey and Nibler, 1973
	3	NN stretch	1529	N₂	Ra	Bondybey and Nibler, 1973
a_u	4	Torsion	1288.65	gas	IR	Hallin, Johns, et al., 1981 Hegelund, Burger, et al., 1994 Demaison, Hegelund, et al., 1997
	4	Torsion	1283	Ar	IR	Minkwitz, 1975
	4	Torsion	1286	N₂	IR Ra	Rosengren and Pimentel, 1965 Bondybey and Nibler, 1973 Minkwitz, 1975
b_u	5	NH stretch	3120.29	gas	IR	Trombetti, 1968 Carlotti, Johns, et al., 1974 Hallin, Johns, et al., 1981 Hegelund, Burger, et al., 1994
	5	NH stretch	3118	Ar	IR	Minkwitz, 1975
	5	NH stretch	3137	N₂	IR	Minkwitz, 1975
	6	NH bend	1316.41	gas	IR	Hallin, Johns, et al., 1981 Hegelund, Burger, et al., 1994 Demaison, Hegelund, et al., 1997
	6	NH bend	1313	Ar	IR	Minkwitz, 1975
	6	NH bend	1321	N₂	IR	Bondybey and Nibler, 1973 Minkwitz, 1975

Additional references: Jacox, 1994, page 147; Jacox, 1998, page 227; Jacox, 2003, page 175; Hegelund, Burger, et al., 1996

Notes

Energy separation between the v = 0 levels of the excited and electronic ground states.

References

Go To: Top, Gas phase ion energetics data, Vibrational and/or electronic energy levels, NIST Free Links, Notes

Foner and Hudson, 1978
Foner, S.N.; Hudson, R.L., On the heat of formation of diimide, J. Chem. Phys., 1978, 68, 3162. [all data]

Foner and Hudson, 1978, 2
Foner, S.N.; Hudson, R.L., Determination of the proton affinity of N₂ from ionization data on trans-diimide, J. Chem. Phys., 1978, 68, 3169. [all data]

Neudorfl, Back, et al., 1981
Neudorfl, P.S.; Back, R.A.; Douglas, A.E., The absorption spectrum of, Can. J. Chem., 1981, 59, 3, 506, https://doi.org/10.1139/v81-071 . [all data]

Trombetti, 1968
Trombetti, A., The infrared and ultraviolet absorption spectra of diimide (N, Can. J. Phys., 1968, 46, 8, 1005, https://doi.org/10.1139/p68-127 . [all data]

Willis and Back, 1973
Willis, C.; Back, R.A., Di-imide: Some Physical and Chemical Properties, and the Kinetics and Stoichiometry of the Gas-phase Decomposition, Can. J. Chem., 1973, 51, 21, 3605, https://doi.org/10.1139/v73-536 . [all data]

Back, Willis, et al., 1974
Back, R.A.; Willis, C.; Ramsay, D.A., The Near-ultraviolet Absorption Spectrum of Diimide Vapor, Can. J. Chem., 1974, 52, 6, 1006, https://doi.org/10.1139/v74-160 . [all data]

Back, Willis, et al., 1978
Back, R.A.; Willis, C.; Ramsay, D.A., The near-ultraviolet absorption spectrum of diimide: a re-examination, Can. J. Chem., 1978, 56, 11, 1575, https://doi.org/10.1139/v78-255 . [all data]

Bondybey and Nibler, 1973
Bondybey, V.E.; Nibler, J.W., Infrared and Raman spectra of solid and matrix isolated diimide, HNNH, J. Chem. Phys., 1973, 58, 5, 2125, https://doi.org/10.1063/1.1679478 . [all data]

Hallin, Johns, et al., 1981
Hallin, K.-E.J.; Johns, J.W.C.; Trombetti, A., Can. J. Phys., 1981, 59, 663. [all data]

Hegelund, Burger, et al., 1994
Hegelund, F.; Burger, H.; Polanz, O., The High-Resolution Infrared Spectrum of the ν4, ν5, and ν6 Bands of trans-Di-imide Revisited, J. Mol. Spectrosc., 1994, 167, 1, 1, https://doi.org/10.1006/jmsp.1994.1214 . [all data]

Demaison, Hegelund, et al., 1997
Demaison, J.; Hegelund, F.; Burger, H., Experimental and ab initio equilibrium structure of trans-diazene HNNH, J. Mol. Struct., 1997, 413/414, 447, https://doi.org/10.1016/S0022-2860(97)00019-7 . [all data]

Minkwitz, 1975
Minkwitz, R., IR-spektroskopische Untersuchungen an festem Diimin und matrixisoli ertem Diimin, Mono- und Dideutero-diimin, Z. Anorg. Allg. Chem., 1975, 411, 1, 1, https://doi.org/10.1002/zaac.19754110102 . [all data]

Rosengren and Pimentel, 1965
Rosengren, K.; Pimentel, G.C., Infrared Detection of Diimide, N2H2, and Imidogen, NH, by the Matrix Isolation Method, J. Chem. Phys., 1965, 43, 2, 507, https://doi.org/10.1063/1.1696773 . [all data]

Carlotti, Johns, et al., 1974
Carlotti, M.; Johns, J.W.C.; Trombetti, A., Can. J. Phys., 1974, 52, 340. [all data]

Jacox, 1994
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]

Jacox, 1998
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement A, J. Phys. Chem. Ref. Data, 1998, 27, 2, 115-393, https://doi.org/10.1063/1.556017 . [all data]

Jacox, 2003
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement B, J. Phys. Chem. Ref. Data, 2003, 32, 1, 1-441, https://doi.org/10.1063/1.1497629 . [all data]

Hegelund, Burger, et al., 1996
Hegelund, F.; Burger, H.; Polanz, O., High-Resolution Infrared Study of the ν4, ν5, and ν6Bands oftrans-Dideutero-di-imide, DNND, J. Mol. Spectrosc., 1996, 179, 1, 142, https://doi.org/10.1006/jmsp.1996.0192 . [all data]

Notes

Go To: Top, Gas phase ion energetics data, Vibrational and/or electronic energy levels, NIST Free Links, References

Symbols used in this document:

AE Appearance energy
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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