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Synthetic design of new functional molecules remains the main route to obtaining the next generation of sensor materials, and the undesirable consequences of environmental heavy metal burdens call ...

A new phenanthroline derivative, 2-mesityl-1H-imidazo[4,5-f][1,10]phenanthroline (MEIP), was synthesized and characterized by elemental analysis, FT-IR, 1HNMR, and 13CNMR spectra. MEIP was evaluated as corrosion inhibitor for carbon steel in 0.5 M H2SO4 solution using gravimetric and UV−visible spectrophotometric methods at 303−333 K. Results obtained show that MEIP is a good inhibitor for mild steel in H2SO4 solution. The inhibition efficiency was found to increase with increase in MEIP concentration but decreased with temperature, which is suggestive of physical adsorption mechanism. Activation parameters and Gibbs free energy for the adsorption process using Statistical Physics were calculated and discussed. The UV−visible absorption spectra of the solution containing the inhibitor after the immersion of mild steel specimen indicate the formation of a MEIP-Fe complex. The calculations of global reactivity indices of MEIP such as the localization of frontier molecular orbitals, EHOMO, ELUMO, energy gap ...