Chemical polarisation of 13C and 15N nuclei in the thermal decomposition of diazoaminobenzene (1,3-diphenyltriazene)

✍ Scribed by E. Lippmaa; T. Saluvere; T. Pehk; A. Olivson

• Publisher: John Wiley and Sons
• Year: 1973
• Tongue: English
• Weight: 571 KB
• Volume: 5
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.1270050909

✦ Synopsis

Abstract

Chemical polarisation of ^13^C and ^15^N nuclei in the thermal decomposition of diazoaminobenzene has been investigated. Most of the polarised products with the exception of benzene result from cage recombination processes, and both the ^13^C and ^15^N true nuclear polarisation coefficients are rather high, up to 10000 and more. ^13^C CIDNP has been shown to provide a new and useful technique for the measurement of ^13^C spin‐lattice relaxation time T~1~.

Free radical reactions of organic compounds and the corresponding CIDNP mechanisms can be studied very successfully using proton spectra. Since the hyperfine coupling constants with ^13^C and ^15^N nuclei can, however, be considerably larger, the nuclear relaxation times longer and the spectra generally much simpler and easier to interpret in detail, the study of heavier nuclei provides many advantages over ^1^H‐CIDNP, particularly in the case of σ‐radicals.