Other Spin-1/2 Nuclei

Abstract

The series of molecules which has guided us through this book so far was chosen for a good reason: it allowed us to discuss in detail the most important nuclei, the proton and carbon-13, while demonstrating the effect of a very important "heteronucleus", phosphorus-31, on the spectra of the two key nuclei. In addition, we could discuss the NMR investigation of this heteronucleus, which exists in 100% natural abundance and has a spin of ½, and in contrast of oxygen-17, a low-abundance nucleus with a spin greater than ½. Given the large number of elements in the periodic table, we might expect that many other nuclei are NMR-active. This is true, but the number of nuclei Fig. 36 COSY spectrum of acetal 5 obtained in a stopped-flow experiment. Measurement time 11 min 5 Other Spin-½ Nuclei