On the structure and the antisymmetric ν3 IR mode of covalent azide group

Mark Rozenberg*, Francoise Tibika-Apfelbaum

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


A new correlation ν3 = 1997 + 1.17 × 103 Δr between the stretching mode ν3 of the IR band frequency and the bond length asymmetry expressed as Δr ≡ r(N α - Nβ) - r(Nβ - N γ) is established in molecular azides RN αNβNγ with the correlation coefficient R = 0.972. The database represents recent spectral and structural information for more than fifty organic molecules and inorganic metal complexes. Because the absolute term practically coincides with the ν3 frequency value for the free azide group, this correlation shows that the blue shift Δν3 (in cm-1) of the ν3 from the free azide value varies in direct proportion with the N3 group asymmetry Δr (in Å) (Δν3 = 1.17 × 10 3 Δr) at formation of different azide structures.

Original languageAmerican English
Pages (from-to)267-270
Number of pages4
JournalJournal of Molecular Structure
StatePublished - 13 Mar 2013


  • Azides
  • Bond energy
  • Force constant
  • Infrared


Dive into the research topics of 'On the structure and the antisymmetric ν3 IR mode of covalent azide group'. Together they form a unique fingerprint.

Cite this