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. Author manuscript; available in PMC: 2020 Nov 6.
Published in final edited form as: J Am Chem Soc. 2019 Oct 28;141(44):17909–17917. doi: 10.1021/jacs.9b09671

Figure 3.

Figure 3.

Partial 1H NMR spectra (CD3CN/CD2Cl2, 1/1, v/v, 295 K, 500 MHz) of (a) 4a, (j) 5 and (b-i) 6a (or 1:1 mixture of 4a and 5) at the concentration of B21C7 unit of (b) 1 mM (c) 5 mM (d) 10 mM (e) 20 mM (f) 30 mM (g) 40 mM (h) 50 mM (i) 60 mM.