Solvation of Nucleobases in 1,3-Dialkylimidazolium Acetate Ionic Liquids: NMR Spectroscopy Insights into the Dissolution Mechanism Jo˜ao M. M. Ara´ ujo, * Rui Ferreira, Isabel M. Marrucho, * Lu´ ıs P. N. Rebelo Instituto de Tecnologia Qu´ ımica e Biol´ogica, Universidade Nova de Lisboa, Apartado 127, 2780-157 Oeiras, Portugal * Corresponding authors; Telephone: (+351) 214 469 442, Fax: (+351) 214 411 277, E-mail: jmmda@itqb.unl.pt (J.M.M. Ara´ujo); imarrucho@itqb.unl.pt (I.M. Marrucho). 1