Anion Helicates: Double Strand Helical Self-Assembly of Chiral Bicyclic Guanidinium Dimers and Tetramers around Sulfate Templates

摘要

Synthetic molecules possessing helicity .derived from their primary or secondary structures could be related to polypeptides in the α-helix conformation, On the other hand, compounds related to double-helical nucleic acids arise from the spontaneousself-assembly of molecular strands, usually promoted by metal templates (helicates). Double-istranded helicates have been reported with tetrahedral, octahedral, or nondirectional transition metals, whereas triple-stranded helices result from octahedral coordination metals or lanthanides. Here, we describe the first example of a double-helical structure folding around anions.