Nitrogen oxide bond lengths

Formation of the bicyclic lithiated intermediate 8 is considered to be a two-step process whereby the nitrogen atom of nitric oxide attaches to the Cl atom of propynyllithium. Addition of a second molecule of nitric oxide gives intermediate 8 that on reaction with water produces 5-methyl-l,2,3-oxatriazole 3-oxide 9 (Scheme 1). Calculated, optimized geometry and bond lengths for stmcture 9 together with calculated infrared (IR) and Raman spectra are reported <2005JOC5045>. 

Ingold518 was the first to propose that nitric acid anhydride N205 has an ionic structure N02+N03. This was later confirmed by Wilson and Christe,519 who showed a linear symmetric N02+ with an N—O bond length of about 1.154 A. The structure of reaction products formed between nitrogen oxides and BF3, including N02+BF4 was established by Olah and co-workers520,521 on the basis of Raman, IR, and X-ray diffraction data. 

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