O=C=C=NOH

Formula: C₂HNO₂
Molecular weight: 71.0348
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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	OH stretch	3583.2	w	Ar	IR	Maier, Reisenauer, et al.
	2	CCO stretch	2074.1	vs	Ar	IR	Maier, Reisenauer, et al.
	4	HON bend	1357.7	w m	Ar	IR	Maier, Reisenauer, et al.
	5	CNO stretch	889.1	w T	Ar	IR	Maier, Reisenauer, et al.
	6	CNO stretch	882.8	m	Ar	IR	Maier, Reisenauer, et al.
a	10	HON deform.	512.5	w	Ar	IR	Maier, Reisenauer, et al.
	11	HON deform.	500.9	w T	Ar	IR	Maier, Reisenauer, et al.

Additional references: Jacox, 1998, page 317

Notes

Weak

Medium

Very strong

Tentative assignment or approximate value

References

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Maier, Reisenauer, et al.
Maier, G.; Reisenauer, H.P.; Rother, B.; Eckwert, J., Liebigs Ann. 1996, 303.. [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]

Notes

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Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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