# Which of the most commonly found elements in organic molecules are suitable for NMR?

Jul 2, 2015

The most common isotopes used for NMR are $\text{^1"H}$ and $\text{^13"C}$.

#### Explanation:

We have to talk about isotopes rather than elements, because an isotope must have a non-zero nuclear spin to be detected by NMR.

That's why $\text{^12"C}$ does not give an NMR signal — its nuclear spin is zero.

Isotopes such as $\text{^14"N}$, $\text{^15"N}$, $\text{^17"O}$, $\text{^19"F}$, $\text{^31"P}$, and $\text{^ 35"Cl}$ are also important in NMR, because these elements are often found in biological and pharmaceutical compounds.

Other nuclei that are used in NMR are $\text{^2"H}$, $\text{^6"Li}$, $\text{^10"B}$, $\text{^11"B}$, $\text{^23"Na}$, $\text{^29"Si}$, $\text{^113"Cd}$, $\text{^129"Xe}$, and $\text{^195"Pt}$.