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Partial 1H NMR spectra (CD3COCD3, 295 K, 400 MHz) of bis-ammonium linker 4 (A), and equal molar 4 and 1 at the concentration of 40 mM (B), 30 mM (C), 20 mM (D), 10 mM (E), 5.0 mM (F), 1.0 mM (G), and metallacycle 1 (H). The acetone peaks are marked with asterisks.
