Amidogen, methylene-

Formula: CH₂N
Molecular weight: 28.0333
IUPAC Standard InChI: InChI=1S/CH2N/c1-2/h1H2
IUPAC Standard InChIKey: PZIDJKOIMRBQLL-UHFFFAOYSA-N
CAS Registry Number: 15845-29-1
Chemical structure:
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Gas phase ion energetics data

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Data compiled as indicated in comments:
LL - Sharon G. Lias and Joel F. Liebman
B - John E. Bartmess

View reactions leading to CH₂N⁺ (ion structure unspecified)

Electron affinity determinations

EA (eV)	Method	Reference	Comment
0.5110 ± 0.0080	LPES	Cowles, Travers, et al., 1991	B
0.510 ± 0.069	IMRB	Kass and DePuy, 1985	EA: between O₂ and cyclooctatetraene; B

Ionization energy determinations

IE (eV)	Method	Reference	Comment
9.4 ± 0.1	PI	Nesbitt, Marston, et al., 1991	LL

Vibrational and/or electronic energy levels

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Data compiled by: Marilyn E. Jacox

State: B

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


T_o = 35047	gas	B-X	280	285	Ogilvie and Horne, 1968
					Horne and Norrish, 1970
					Ogilvie, 1974
					Bernard, Strazisar, et al., 1999
					Nizamov and Dagdigian, 2003
					Teslja, Dagdigian, et al., 2006
T_o = 34990 ± 25	Ar	B-X	270	285	Jacox, 1987

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


a₁	1	CH₂ s-stretch	2774 ± 50	T	Ar	AB	Jacox, 1987
	2	CN stretch	1883 ± 50		Ar	AB	Jacox, 1987
	3	CH₂ scissors	1413 ± 50		Ar	AB	Jacox, 1987
b₁	4	OPLA	270	H	gas	CR	Teslja, Dagdigian, et al., 2006
	4	OPLA	223	H	Ar	AB	Jacox, 1987

State: X

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


a₁	1	CH₂ s-stretch	2820	T	gas	PE	Cowles, Travers, et al., 1991
	2	CN stretch	1725.4	w	Ar	IR	Jacox, 1987
	3	CH₂ scissors	1337	T	gas	PE	Cowles, Travers, et al., 1991
	3	CH₂ scissors	1336.6	m	Ar	IR	Jacox, 1987
	3	CH₂ scissors	1332.7		Kr	IR	Pettersson, Lundell, et al., 1998
	3	CH₂ scissors	1328.7		Xe	IR	Pettersson, Lundell, et al., 1998
b₁	4	OPLA	954.1	w m	Ar	IR	Jacox, 1987
	4	OPLA	950.3		Kr	IR	Pettersson, Lundell, et al., 1998
b₂	5	CH₂ a-stretch	3103.2	m	Ar	IR	Jacox, 1987
	6	CH₂ rock	912.8	w	Ar	IR	Jacox, 1987
	6	CH₂ rock	909.0		Kr	IR	Pettersson, Lundell, et al., 1998

Additional references: Jacox, 1994, page 140; Jacox, 2003, page 171; Cochran, Adrian, et al., 1962; Banks and Gordy, 1973; Yamamoto and Saito, 1992

Notes

Weak

Medium

(1/2)(2ν)

Tentative assignment or approximate value

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

References

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Cowles, Travers, et al., 1991
Cowles, D.C.; Travers, M.J.; Frueh, J.L.; Ellison, G.B., Photoelectron Spectroscopy of CH2N-, J. Chem. Phys., 1991, 94, 5, 3517, https://doi.org/10.1063/1.459773 . [all data]

Kass and DePuy, 1985
Kass, S.R.; DePuy, C.H., Gas phase ion chemistry of azides. The generation of CH=N^- and CH₂=NCH₂^-, J. Org. Chem., 1985, 50, 2874. [all data]

Nesbitt, Marston, et al., 1991
Nesbitt, F.L.; Marston, G.; Stief, L.J.; Wickramaaratchi, M.A.; Tao, W.; Klemm, R.B., Measurement of the photoionization spectra and ionization thresholds of the H₂CN and D₂CN radicals, J. Phys. Chem., 1991, 95, 7613. [all data]

Ogilvie and Horne, 1968
Ogilvie, J.F.; Horne, D.G., Electronic Absorption Spectra of Methanal Azine and the Methyleniminyl Free Radical, J. Chem. Phys., 1968, 48, 5, 2248, https://doi.org/10.1063/1.1669419 . [all data]

Horne and Norrish, 1970
Horne, D.G.; Norrish, R.G.W., The Photolysis of Acyclic Azines and the Electronic Spectra of RFormulaRFormulaCNFormula Radicals, Proc. Roy. Soc. (London) A315, 1970, 315, 1522, 301, https://doi.org/10.1098/rspa.1970.0045 . [all data]

Ogilvie, 1974
Ogilvie, J.F., Can. J. Spectrosc., 1974, 19, 89. [all data]

Bernard, Strazisar, et al., 1999
Bernard, E.J.; Strazisar, B.R.; Davis, H.F., Excited state dynamics of H2CN radicals, Chem. Phys. Lett., 1999, 313, 3-4, 461, https://doi.org/10.1016/S0009-2614(99)01062-3 . [all data]

Nizamov and Dagdigian, 2003
Nizamov, B.; Dagdigian, P.J., Spectroscopic and Kinetic Investigation of Methylene Amidogen by Cavity Ring-Down Spectroscopy, J. Phys. Chem. A, 2003, 107, 13, 2256, https://doi.org/10.1021/jp022197i . [all data]

Teslja, Dagdigian, et al., 2006
Teslja, A.; Dagdigian, P.J.; Banck, M.; Eisfeld, W., Experimental and Theoretical Study of the Electronic Spectrum of the Methylene Amidogen Radical (H, J. Phys. Chem. A, 2006, 110, 25, 7826, https://doi.org/10.1021/jp061578j . [all data]

Jacox, 1987
Jacox, M.E., Vibrational and electronic spectra of the hydrogen atom + hydrogen cyanide reaction products trapped in solid argon, J. Phys. Chem., 1987, 91, 27, 6595, https://doi.org/10.1021/j100311a008 . [all data]

Pettersson, Lundell, et al., 1998
Pettersson, M.; Lundell, J.; Khriachtchev, L.; Rasanen, M., Neutral rare-gas containing charge-transfer molecules in solid matrices. III. HXeCN, HXeNC, and HKrCN in Kr and Xe, J. Chem. Phys., 1998, 109, 2, 618, https://doi.org/10.1063/1.476599 . [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, 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]

Cochran, Adrian, et al., 1962
Cochran, E.L.; Adrian, F.J.; Bowers, V.A., ESR Detection of the Cyanogen and Methylene Imino Free Radicals, J. Chem. Phys., 1962, 36, 7, 1938, https://doi.org/10.1063/1.1701294 . [all data]

Banks and Gordy, 1973
Banks, D.; Gordy, W., Electron spin resonance and bond structure of H, Mol. Phys., 1973, 26, 6, 1555, https://doi.org/10.1080/00268977300102721 . [all data]

Yamamoto and Saito, 1992
Yamamoto, S.; Saito, S., The microwave spectrum of the CH2N radical in the X 2B2 ground electronic state, J. Chem. Phys., 1992, 96, 6, 4157, https://doi.org/10.1063/1.461871 . [all data]

Notes

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Symbols used in this document:

EA Electron affinity
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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