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. Author manuscript; available in PMC: 2019 Apr 17.

Published in final edited form as: Phys Chem Chem Phys. 2019 Jan 30;21(5):2337–2344. doi: 10.1039/c8cp07737a

Table 4. Enthalpies of formation of the hydrogen cyanide isomers, their cations, and the CN radical at 300 K.

	Δ_fH° / kJ.mol⁻¹	Ref.
HCN	135.1(84)	¹⁹ and ²⁰
	129.283(91)	56
HCN⁺	1448.0(84)	¹⁹, ²⁰, and ¹³
	1442.06(20)	56
HNC	178(10)	⁶³, ¹⁹, and ²⁰
	197(12)	64
	189(3)	this work and ²⁷,⁶¹
	184(3)	this work and ²⁷,⁶⁰
	188(4)	27
	192.40(38)	56
HNC⁺	1348(3)	27,56
	1342(3)	27,60
	1349(4)	27
	1352.9(13)	56

CN	439.7(48)	61,62
	434.5(20)	60
	440.0(1)	56