Fig. 3: ESI-TOF-MS spectra of NaOTf ⊂ 6, 6/7 and 9/10.

a Experimental (black) and calculated (red) ESI-TOF-MS spectra of NaOTf ⊂ 6 ([M + NaOTf-2OTf−]2+). b Experimental (black) and calculated (red) ESI-TOF-MS spectra of 7 ([2M-3OTf−]3+). c Experimental (black) and calculated (red) ESI-TOF-MS spectra of 10. For full spectra, see Supplementary Figs. 16, 21 and 26.