Calix[4]arene-based metal-organic frameworks: towards hierarchically porous materials

An upper rim-functionalised calix[4]arene dicarboxylic acid (H2caldc) has been used to prepare four metal–organic frameworks, three of which have been structurally characterised and shown to form two- or three-dimensional network structures. Simulations suggest that such networks are likely to display interesting selectivity to guest molecules.