Noncovalent Synthesis of Melamine−Cyanuric/Barbituric Acid Derived Nanostructures: Regio- and Stereoselection

The hydrogen bond directed self-assembly of calix[4]arene dimelamines and barbituric or cyanuric acid derivatives gives ready access to organic nanostructures of nanometer dimensions. The synthesis, characterization, and supramolecular chirality of these noncovalent assemblies are discussed in detail, together with means of achieving regio-, diastereo-, and enantioselection. Self-organizing behaviour into higher order aggregates on solid surfaces is also described.