Molecules and assemblies of molecules with well-defined secondary structures have been designed and characterized by controllingnoncovalent interactions. By specifying intermolecular interactions, a class of information-storing molecular duplexes have been successfully developed. These H-bonded molecular duplexes demonstrate programmable, sequence-specificity and predictable, tunable stabilities. Based on these highly specific molecular zippers (or glues), a systematic approach todesigning self-assembled structures is now feasible. .
