HCNCC

Vibrational and/or electronic energy levels

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


Σ⁺	1	CH stretch	3277	m	Ar	IR	Guennoun, Couturier-Tamburelli, et al., 2003
	2		2102	s	Ar	IR	Guennoun, Couturier-Tamburelli, et al., 2003 Khriachtchev, Lignell, et al., 2006
	2		2098		Kr	IR	Khriachtchev, Lignell, et al., 2006
	2		2096		Xe	IR	Khriachtchev, Lignell, et al., 2006
	3		1920	w	Ar	IR	Guennoun, Couturier-Tamburelli, et al., 2003

Weak

Medium

Strong

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Guennoun, Couturier-Tamburelli, et al., 2003
Guennoun, Z.; Couturier-Tamburelli, I.; Pietri, N.; Aycard, J.P., UV photoisomerisation of cyano and dicyanoacetylene: the first identification of CCNCH and CCCNCN isomers -- matrix isolation, infrared and ab initio study, Chem. Phys. Lett., 2003, 368, 5-6, 574, https://doi.org/10.1016/S0009-2614(02)01898-5 . [all data]

Khriachtchev, Lignell, et al., 2006
Khriachtchev, L.; Lignell, A.; Tanskanen, H.; Lundell, J.; Kiljunen, H.; Rasanen, M., Insertion of Noble Gas Atoms into Cyanoacetylene: An ab Initio and Matrix Isolation Study, J. Phys. Chem. A, 2006, 110, 42, 11876, https://doi.org/10.1021/jp063731f . [all data]

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Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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