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Fig. S1 Electronic spectrum of a solution of Ni²⁺ in trifluoroethanol (λ_max = 603 nm), compared with the spectra of solutions of Ni²⁺ together with different amounts of copolymer (0.5, 1, 1.5, 2, 3, 4 mol of repeat unit per mol of Ni²⁺ metal cation) (λ_max = 589 nm). Fig. S2 Electronic spectra of Ni(II) aqueous solutions, together with different hypothetical ligands: (a) 1-methylpyrrolidine, (b) ammonia only (reference spectrum), (c) the polymer, and (d) succinic acid (pH adjustment to 11.0 with 0.1 M aqueous ammonia)