Fig. 2: ESI-MS of Cu11 and Cu12 in MeOH.

Mass spectra of Cu11 (a) and Cu12 (b), inset: the measured (black trace) and simulated (red trace) isotopic distribution patterns of the corresponding the molecular ion peaks.

Mass spectra of Cu11 (a) and Cu12 (b), inset: the measured (black trace) and simulated (red trace) isotopic distribution patterns of the corresponding the molecular ion peaks.