The case studies above highlight the power of NMR spectroscopy in revealing the chemistry of carbon dioxide capture. A particular success of the approach has been in studying the adsorption mechanisms that operate and the speciation of CO2 in the captured state. In some cases NMR studies have revealed new adsorption mechanisms in CO2 capture materials that were not readily accessible with other techniques. Moreover, diffusion measurements have been used to probe CO2 transport mechanisms in capture materials.