1,8-bis(dimethylaminomethyl)naphthalene (DMAMN), which exhibits the features of a protonsponge, has been synthesized. 1H NMR, infrared and X-ray diffraction studies on protonated DMAMN indicate the formation of intramolecular NHN + hydrogen bonds which are a little weaker than those in protonated1,8-bis(dimethylamino)naphthalene (DMAN). This is particularly apparent in the IR spectra of solid salts