overcome the proton-transfer energies (see Supp. Info Table -ST5). This therefore, stabilizes the salt structures for the 1:1 adducts. Interesting, for the formic acid…furan adduct, ΔGPT is very high (+177.9 kcal/mol) due to the poor basicity of furan. As a result, increased electrostatic interactions in the salt configuration fail to compensate ΔGPT.