Since the discovery of the DNA double helix,[1] the developments of artificial double helices have attracted significant attention.[2] Nevertheless, double helices with a controlled helix- sense are quite rare,[2–4] whereas a number of single helical oligomers and polymers have been reported.[5] Metal-directed self-assembly is the most widely used approach to construct double-stranded helices, helicates.[2a–c] Hydrogenbonding-driven self- ...