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. 2019 May 8;141(22):8907–8913. doi: 10.1021/jacs.9b02207

Figure 1.

Figure 1

Ligand and cage synthesis. (a) Preparation of ligands L1 and L2: (i) Mg, THF; (ii) AlCl3, toluene; (iii) KMnO4, pyridine/H2O; (iv) Ac2O; (v) for L1: 3-aminopyridine, 165 °C, 10 min; for L2: 6-aminoquinoline, 165 °C, 10 min. (b) Ligand L1 assembles with PdII cations to cage [Pd2L14]4+ capable of selectively binding C60. (c) 1H NMR spectra (600 MHz, 298 K, CD3CN) of Ligand L1 (2.56 mM), cage [Pd2L14]4+ (0.64 mM), host–guest complex [C60@Pd2L14]4+ (0.64 mM) obtained from mixing free cage [Pd2L14]4+ with pure C60 at 70 °C (from bottom to top).