Inherently Chiral Azonia[6]helicene-Modified β‑Cyclodextrin: Synthesis, Characterization, and Chirality Sensing of Underivatized Amino Acids in Water

The (<i>P</i>)- and (<i>M</i>)-3-azonia­[6]­helicenyl β-cyclodextrins exhibit l/d selectivities of up to 12.4 and <i>P</i>/<i>M</i> preferences of up to 28.2 upon complexation with underivatized proteinogenic amino acids in aqueous solution at pH 7.3