The extraction of tetrabutylammonium nitrate into dilute solutions of 1-decanol, ROH, in 1,2-dichloroethane has been studied and the nature of the extracted species has been determined. Over the entire accessible concentration range, the organic-phase species is an ion pair of the tetrabutylammonium cation and the monosolvated nitrate ion, NO 3 −·ROH. These results have been compared to those for tetraheptylammonium fluoride where substantial differences in solvation arise.