Bow-tie metallo-cryptophanes from a carboxylate derived cavitand

摘要

A new carboxylic acid functionalised cavitand forms [Cu_3L_2] metallo-cryptophanes with Cu(OAc)_2 that can be linked together into dimers with the bridging ligand l,2-bis(4-pyridyl)ethylene. Reaction of the cavitand with Co(OAc)_2 gives a metallo-cryptophane with a central Co_7 cluster. Cyclotriveratrylene (CTV) is a macrocyclic host molecule with a shallow molecular cavity and pyramidal shape. Derivatives of CTV and related cryptophanes have emerging applications in a range of areas including sensors and separations. A number of CTV analogues with appended ligand functionality capable of coordinating to transition metals are known, and some of these have been used to generate coordination polymers or discrete metallo-supramolecular assemblies.