Fig. 1: Design and structures of calix[2]azolium[2]benzimidazolones.
From: Calix[2]azolium[2]benzimidazolone hosts for selective binding of neutral substrates in water
a The synthetic route of water-soluble macrocycle calix[2]azolium[2]benzimidazolones. b–e Chemical structures of H1–H4. f–i Side views of the solid-state structures of H1–H4 obtained from single crystal X-ray diffraction analyses. j–m Top views of the solid-state structures of H1–H4 obtained from single crystal X-ray diffraction analyses. Color codes: carbon, gray; nitrogen, blue; oxygen, red; hydrogen, white.
