A conformationally flexible tetrapyridyl ligand was assembled separately with three cis-blocked 90° Pd acceptors (, , and ) containing different blocking diamines. Surprisingly, different conformations of the donor were arrested by the acceptors depending on the nature of the blocking amine, leading to the formation of isomeric Pd barrels (, , and ). and with larger windows have been used to encapsulate polyaromatic hydrocarbons.
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