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Chiral nanosized confinements play a major role for enantioselective recognition and reaction control in biological systems. Supramolecular self‐assembly gives access to artificial mimics with tunable sizes and properties. Herein, a new family of [Pd 2 L 4 ] coordination cages based on a chiral [6]helicene backbone is introduced. A racemic mixture of the bis‐monodentate pyridyl ligand  L 1   selectively assembles with Pd II  cations under chiral self‐discrimination to an achiral  meso  cage,  cis ‐[Pd 2  L 1 P    2  L 1 M    2 ]. Enantiopure  L 1   forms homochiral cages [Pd 2  L 1 P / M    4 ]. A longer derivative  L 2   forms chiral cages [Pd 2  L 2 P / M    4 ] with larger cavities, which bind optical isomers of chiral guests with different affinities. Owing to its distinct chiroptical properties, this cage can distinguish non‐chiral guests of different lengths, as they were found to squeeze or elongate the cavity under modulation of the helical pitch of the helicenes. The CD spectroscopic results were supported by ion mobility mass spectrometry.

Chiral Self‐Discrimination and Guest Recognition in Helicene‐Based Coordination Cages