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Absorption spectra of aqueous solutions of metal‐free B12 ligands Hby and Hbl and of their NiII‐complexes Niby and Nibl at 298 K. Top: UV/Vis‐absorption spectra of Hby (c=31.5 μm, pH 5, black trace) and Niby (c=34.5 μm, unbuffered, red trace). Bottom: UV/Vis‐absorption of Hbl (pH 5, black trace) and of Nibl (unbuffered, red trace).
