Novel liquid crystal (LC) namely, (E)-N-hexadecyl-4-(((4-iodophenyl)imino)methyl)-N, N-dimethylbenzenaminium bromide (IC16) was prepared and characterized by Fourier transform IR (FT-IR) , 1H NMR spectra , and mass spectrometry.The thermotropic liquid-crystalline (LC) properties were examined by differential scanning calorimetry (DSC).The prepared LC was evaluated as corrosion inhibitor with non-electrochem. and electrochem. methods.Electrochem. methods include potentiodynamic polarization (PP), electrochem. impedance spectroscopy (EIS), electrochem. frequency modulation (EFM).Non electrochem. method measuring with different temperatureThe results showed that the synthesized compound possesses liquid crystal properties and it has a significant efficiency as anticorrosion (91%-97%).The adsorption of IC16 compound on mild steel surface was found to follow the Langmuir isotherm.Which was in good agreement with the theor. calculations?