¹⁴N NMR as a General Tool to Characterize the Nitrogen-Containing Species and Monitor the Nitration Process

Abstract

The usefulness of 14 N NMR spectroscopy was highly underestimated compared with 15 N NMR, which usually required tedious and expensive 15 N-labeling manipulations. It is of great significance to make the 14 N NMR spectroscopy convenient and useful considering 14 N nuclei's high natural abundance of 99.6%. Herein, lots of efforts have been made to generalize routine 14 N NMR to characterize nitrogen-containing species by tuning the balance between the solubility and viscosity of the samples. Satisfactory 14 N NMR spectra of more than 60 nitrogen-containing compounds have been recorded, and the chemical shifts and the peaks' full width at half-maxima of more than 10 nitrogenbased functionalities have been summarized. Successful monitoring of the orthoselective nitration of aniline has been demonstrated using the 14 N NMR protocol developed in this paper, which will help realize the visualization of nitration processes in the industry.

Synthesis and detonation performance of novel tetrazolyl–triazine nitrogen-rich energetic materials

“…The chemical shifts are in agreement with other tetrazole- and/or triazine-based compounds in the literature. 30–34…”

“…The chemical shifts are in agreement with other tetrazole-and/or triazine-based compounds in the literature. [30][31][32][33][34] Compound 2 was initially analyzed through 1 H-NMR spectroscopy (Fig. S8, ESI †) in DMSO-d 6 .…”

Anions Containing Tripoid Conjugated N4− System: Salts of 5-(Substituted Amino)-[1,2,3]triazolo[4,5-c][1,2,5]oxadiazol-5-ium-4-ides, as well as Their Synthesis, Structure, and Thermal Stability

“…In all 14 N NMR [ 23 ] spectra of triazolofurazans 3 – 6 , at least two signals related to the heterocyclic framework are observed. One narrow signal of the N-5 atom is in the range from −30 to −80 ppm (Δν ½ = 60–200 Hz).…”

Parahydrogen‐Induced Polarization of 14N Nuclei

“…The authors have cited additional references within the Supporting Information. [37][38][39][40][41][42][43][44][45][46][47][48]…”