Closed and Open Clamlike Structures Formed by Hydrogen‐Bonded Pairs of Cyclotricatechylene Anions that Contain Cationic “Meat”

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Abstract
Clamming up: The hexaphenolic compound cyclotricatechylene, which has a bowl‐shaped cavity, forms clamlike pairs that encapsulate cations (see picture). Variable hydrogen bonding allows two linked cyclotricatechylene clamshells to be in a closed arrangement when smaller cations such Rb+ or Cs+ provide the clam meat, whereas larger cations such as NMe4+ and NEt4+ cause the clam to be partially opened. magnified image

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