The phase behaviour of n-alkylammonium (C6 to C16) nitrates and formates have been characterised by using synchrotron small angle and wide angle X-ray scattering (SAXS/WAXS), differential scanning calorimetry (DSC), cross polarised optical microscopy (CPOM), and Fourier Transform Infrared Spectroscopy (FTIR). The protic salts may exist as crystalline, liquid crystalline and ionic liquid materials depending on the alkyl chain length and temperature. n-alkylammonium nitrates with n ?