By using alternating-current electrochemical synthesis, crystals of the Cu^I π-complexes bis(1-allyl-2-amino­pyridinium) di-μ-chloro-bis­[chloro­copper(I)], (C₈H₁₁N₂)₂[Cu₂Cl₄] or [H₂NC₅H₄NC₃H₅][CuCl₂], and bis(1-allyl-2-amino­pyridinium) di-μ-(chloro/bromo)-bis­[(chloro/bromo)copper(I)], (C₈H₁₁N₂)₂[Cu₂Br_2.2Cl_1.8] or [H₂NC₅H₄NC₃H₅][CuBr_1.10Cl_0.90], have been obtained and structurally investigated. In each of the isostructural (isomorphous) compounds, the distorted tetrahedral Cu environment involves three halide atoms and the C=C bond of the ligand. Both compounds reside on inversion centres, and the dimeric [Cu₂X₄·2H₂NC₅H₄NC₃H₅] units are bonded into a three-dimensional structure by N—HX hydrogen bonds. The Br content in the terminal X1 position is much higher than that in the bridged X2 site.