ONO-NO2 (D)

Formula: N₂O₄
Molecular weight: 92.0110
CAS Registry Number: 15969-55-8
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Vibrational and/or electronic energy levels

State: X

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


a'	1	N=O stretch	1824.9	s	Ne	Ra IR	Bolduan and Jodl, 1982 Beckers, Zeng, et al., 2010
	1	N=O stretch	1828		Ar	IR	Fateley, Bent, et al., 1959 Louis and Crawford, 1965 Bandow, Akimoto, et al., 1984
	1	N=O stretch	1861		N₂	IR	Varetti and Pimentel, 1971
	1	N=O stretch	1829		O₂	IR	Fateley, Bent, et al., 1959 Louis and Crawford, 1965 Smith and Guillory, 1977
	2	NO₂ a-stretch	1656.2		Ne	Ra IR	Bolduan and Jodl, 1982 Beckers, Zeng, et al., 2010
	2	NO₂ a-stretch	1644		Ar	IR	Fateley, Bent, et al., 1959 Louis and Crawford, 1965 Bandow, Akimoto, et al., 1984
	2	NO₂ a-stretch	1646 ± 3		Xe	Ra	Bolduan and Jodl, 1982
	2	NO₂ a-stretch	1628		N₂	IR	Varetti and Pimentel, 1971
	2	NO₂ a-stretch	1645		O₂	IR	Fateley, Bent, et al., 1959 Louis and Crawford, 1965 Smith and Guillory, 1977
	3	NO₂ s-stretch	1293.2	m	Ne	Ra IR	Bolduan and Jodl, 1982 Beckers, Zeng, et al., 2010
	3	NO₂ s-stretch	1290		Ar	IR	Fateley, Bent, et al., 1959 Louis and Crawford, 1965 Bandow, Akimoto, et al., 1984
	3	NO₂ s-stretch	1299 ± 3		Xe	Ra	Bolduan and Jodl, 1982
	3	NO₂ s-stretch	1279		N₂	IR	Varetti and Pimentel, 1971
	3	NO₂ s-stretch	1291		O₂	IR	Fateley, Bent, et al., 1959 Louis and Crawford, 1965 Smith and Guillory, 1977
	4	N-O stretch	903.3	w	Ne	IR	Beckers, Zeng, et al., 2010
	4	N-O stretch	903		Ar	IR	Bandow, Akimoto, et al., 1984
	4	N-O stretch	905		O₂	IR	Louis and Crawford, 1965
	5	NO₂ bend	792.9	m	Ne	Ra IR	Bolduan and Jodl, 1982 Beckers, Zeng, et al., 2010
	5	NO₂ bend	787		Ar	IR	Fateley, Bent, et al., 1959 Louis and Crawford, 1965 Bandow, Akimoto, et al., 1984
	5	NO₂ bend	788 ± 3		Xe	Ra	Bolduan and Jodl, 1982
	5	NO₂ bend	792		N₂	IR	Varetti and Pimentel, 1971
	5	NO₂ bend	783		O₂	IR	Fateley, Bent, et al., 1959 Louis and Crawford, 1965 Smith and Guillory, 1977
	6	O=N-O bend	639.0		Ne	Ra IR	Bolduan and Jodl, 1982 Beckers, Zeng, et al., 2010
	6	O=N-O bend	626 ± 3		Xe	Ra	Bolduan and Jodl, 1982
	6	O=N-O bend	647		N₂	IR	Varetti and Pimentel, 1971
	6	O=N-O bend	642		O₂	IR	Louis and Crawford, 1965 Smith and Guillory, 1977
	7	Deformation	488.2		Ne	IR	Beckers, Zeng, et al., 2010
	7	Deformation	488		O₂	IR	Louis and Crawford, 1965 Smith and Guillory, 1977
	8	O-N stretch	306.0	m	Ne	IR	Beckers, Zeng, et al., 2010
	8	O-N stretch	304		O₂	IR	Smith and Guillory, 1977
a	10	O₂NO umbrella	784.1	w	Ne	IR	Beckers, Zeng, et al., 2010

Additional references: Jacox, 1994, page 351

Notes

Weak

Medium

Strong

References

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Bolduan and Jodl, 1982
Bolduan, F.; Jodl, H.J., Raman spectroscopy on matrix-isolated No+, No-3 and N2O4 in Ne, Chem. Phys. Lett., 1982, 85, 3, 283, https://doi.org/10.1016/0009-2614(82)80294-7 . [all data]

Beckers, Zeng, et al., 2010
Beckers, H.; Zeng, X.; Willner, H., Intermediates Involved in the Oxidation of Nitrogen Monoxide: Photochemistry of the, Chem. Eur. J., 2010, 16, 5, 1506, https://doi.org/10.1002/chem.200902406 . [all data]

Fateley, Bent, et al., 1959
Fateley, W.G.; Bent, H.A.; Crawford, B., Jr., Infrared Spectra of the Frozen Oxides of Nitrogen, J. Chem. Phys., 1959, 31, 1, 204, https://doi.org/10.1063/1.1730296 . [all data]

Louis and Crawford, 1965
Louis, R.V.St.; Crawford, B., Jr., Infrared Spectrum of Matrix-Isolated NO2, J. Chem. Phys., 1965, 42, 3, 857, https://doi.org/10.1063/1.1696071 . [all data]

Bandow, Akimoto, et al., 1984
Bandow, H.; Akimoto, H.; Akiyama, S.; Tezuka, T., Photolysis of asym-N2O4 (ONONO2) isolated in an argon matrix at 11 K, Chem. Phys. Lett., 1984, 111, 4-5, 496, https://doi.org/10.1016/0009-2614(84)85547-5 . [all data]

Varetti and Pimentel, 1971
Varetti, E.L.; Pimentel, G.C., Isomeric Forms of Dinitrogen Trioxide in a Nitrogen Matrix, J. Chem. Phys., 1971, 55, 8, 3813, https://doi.org/10.1063/1.1676666 . [all data]

Smith and Guillory, 1977
Smith, G.R.; Guillory, W.A., Spectroscopy of the thermal oxidation of NO in solid oxygen at cryogenic temperatures, J. Mol. Spectrosc., 1977, 68, 2, 223, https://doi.org/10.1016/0022-2852(77)90438-6 . [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]

Notes

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Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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