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Herein, the synthesis and investigation of two naphthalene diimide derivatives with the ethylenesulfonic (NDI1) and methylenecarboxylic (NDI2) groups appended to diimide nitrogen atoms in the form of potassium salts are reported. Synthesized compounds are characterized by 1H NMR, 13C NMR, and elemental analysis. Electrochemical performance of the diimides is evaluated in half‐cells with potassium...