Fig. 3: HRESI mass spectra.

a HRESI mass spectra of Zn4Er6L26 cage in CH3CN. Inset: Observed and simulated mass peaks at m/z = 2576 with isotopic distribution patterns separated by (0.50 ± 0.005) Da. b HRESI mass spectra of Zn2Er8L38 cage in CH3CN/CH2Cl2. Inset: Observed and simulated mass peaks at m/z = 3274 with isotopic distribution patterns separated by (0.50 ± 0.005) Da.