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(a) Assembly of [Pd2LA3LB] heteroleptic cages: addition of short-armed ligands Lc/Ld (left) or long-armed ligands Le/Lf (right) to c-B leads to the synthesis of cages c-B-Lc-f. (b) 1H NMR spectra (500 MHz, CD3CN, 298 K) of homochiral R-c-B, R-c-B-Ld, and R-c-B-Lf. (c) ESI-MS spectrum of c-B-Lf, with isotope pattern of [Pd2(c-La)3Lf + BF4]3+ shown in the inset. (d) ESI-MS spectrum c-B-Ld, with isotope pattern of [Pd2(c-La)3Lf]4+.
