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Average NMR proton chemical shifts, δ1H, of the hydroxyl protons for the cationic clusters [HO-(CH2)2-Py+]n (triangles), ([HO-(CH2)2-Py][BF4])n (c–c) (circles) and ([HO-(CH2)2-Py][BF4])n (c–a) (squares) related to the corresponding monomer values calculated at the B3LYP-D3/6–31+G* level of theory.
