Why is $^{13} C NMR$ $""^13 "C NMR"$ less sensitive?

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Answer 1 · 2015-10-08T01:12:53

There are two main reasons why $^{13} C$ $""^13"C"$ NMR is less sensitive than $^{1} H$ $""^1"H"$ NMR.

A $^{13} C$ $""^13"C"$ nucleus has about $1/400$ $"1/400"$ the sensitivity of a $^{1} H$ $""^1"H"$ nucleus to the NMR phenomenon.
Only about $1.1 %$ $1.1 %$ of all carbon atoms are $^{13} C$ $""^13"C"$ .

Why is ""^13 "C NMR"13C NMR""^13 "C NMR" less sensitive?