“…In the absence of chemical problems such as fast exchange on the NMR timescale, all the I = 1/2 nuclei can be observed relatively easily (all have a greater receptivity than 13 C, although 29 Si and 119 Sn have long T 1 's which can be problematic). The quadrupolar nuclei are a more mixed batch, 9 Be and 11 B have small Q's and are easily observed, 27 Al and 71 Ga can be observed if the electric field gradient is sufficiently small, whereas in practice 115 In is only seen in close to cubic symmetry environments. 25 Mg, 67 Zn and 73 Ge all have unfavourable properties: in addition to being quadrupolar, they have low absolute frequencies and poor natural abundance, and although all have been observed in certain high symmetry cases, they are generally not likely to be useful.…”