Nitrogen: bond enthalpies in gaseous diatomic species

The bond energy in the gaseous diatomic species NN is 945.33 ±0.59 kJ mol-1.

The following values refer to neutral heterodiatomic molecules in the gas phase. These numbers may well differ considerably from, say, single bond energies in a solid. All values are given in kJ mol-1.

Table of diatomic NX bond enthalpies. All values are quoted in kJ mol-1. Each formula in the table (NO, NF, and so on) is a link - select these to see visual periodicity representations for bond enthalpies involving nitrogen to elements of your choice.

Period 1

NH             NHe
<= 339              

Period 2

NLi NBe NB NC NN NO NF NNe
    389 ±21 754.3 ±10 945.33 ±0.59 630.57 ±0.13 343  

Period 3

NNa NMg NAl NSi NP NS NCl NAr
    297 ±96 470 ±15 617.1 ±20.9 464 ±21 333.9 ±9.6  

Period 4

NK NCa NGa NGe NAs NSe NBr NKr
        489 ±2 370 ±11 276 ±21  

Period 5

NRb NSr NIn NSn NSb NTe NI NXe
        301 ±50   159 ±17 23.0

Period 6

NCs NBa NTl NPb NBi NPo NAt NRn
               

Period 7

NFr NRa            
               

Notes

I am grateful to Professor J.A. Kerr (University of Birmingham, UK) for the provision of the bond strengths of diatomic molecules data.

The values given here are at 298 K. All values are quoted in kJ mol-1. Generally, these data were obtained by spectroscopic or mass spectrometric means. You should consult reference 1 for further details. A note of caution: the strength of, say, the C-H bond in the gaseous diatomic species CH (not an isolable species) is not necessarily, the same as the strength of a C-H bond in, say, methane.

The strongest bond for a diatomic species is that of carbon monoxide, CO (1076.5 ± 0.4 kJ mol-1). The strongest bond for a homonuclear diatomic species is that of dinitrogen, N2 (945.33 ± 0.59 kJ mol-1).

References

  1. J.A. Kerr in CRC Handbook of Chemistry and Physics 1999-2000 : A Ready-Reference Book of Chemical and Physical Data (CRC Handbook of Chemistry and Physics, D.R. Lide, (ed.), CRC Press, Boca Raton, Florida, USA, 81st edition, 2000.

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nitrogen atomic number