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A new kind of modified benzotriazole derivative with polyether chain o-phenylenediamine (OPD)/MPEM was synthesized as corrosion inhibition for copper in 3.5 wt.% NaCl solution. The corrosion inhibition efficiency was estimated usingf weight loss measurement, electrochemical methods (Tafel and EIS) and surface analysis scanning electron microscopy. Moreover, corrosion inhibition mechanism was also conducted by the electrochemical determination, the adsorption isotherm as well as the quantum chemical calculation computational methods. All measurements show that OPD/MPEM acts as an efficient corrosion inhibitor and also displays a superior ability to prevent the corrosion of copper in NaCl solution with approximately 88.0% inhibition efficiency at the low level of 60 mg L–1. Computational methods also tell that the inhibitors possess high reactivity and strong interaction on the iron surface. Furthermore, the conclusion is in good agreement with the experimental results. [ABSTRACT FROM AUTHOR]