Calix[4]arene-like Chiral Co₄ and Zn₄ Metallacycles

We report two pairs of enantiomers of Co(II)- and Zn(II)-based metallacycles constructed by coordination-driven self-assembly between homochiral 1,1′-bi-2-naphthol-derived ligands featuring two kinds of coordination pockets and transition-metal ions. Remarkably, they exhibit calix[4]arene-like topological structures and fascinating chiral cavities, having potential in enantioselective recognition.