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. Author manuscript; available in PMC: 2017 Oct 4.

Published in final edited form as: Angew Chem Int Ed Engl. 2016 Jun 22;55(41):12596–12624. doi: 10.1002/anie.201600547

(A) Schematic representation of the [M₄L₆]¹²⁻ assembly, with one molecule of ligand L^a shown explicitly. (B) A space-filling model of 86a. Crystal structures showing (C) NEt₄⁺, (D) BnNMe₃⁺, and (E) [Cp*₂Co]+ ions encapsulated in Ga₄L^a₆ (86a). Adapted with permission from ref 77. Copyright 2009 American Chemical Society.