New C-pivot lariat 16-crown-5 ethers and two metal–crown ether complexes are synthesized and characterised by single-crystal X-ray diffraction which indicates that both the crown ring and the side arm are involved cooperatively with the cation (Na+ or Pb2+) in three-dimensional complexation.
L. K. Liu, C. Lin, D. Young, W. Shyu and C. Ueng, Chem. Commun., 1996, 1255 DOI: 10.1039/CC9960001255
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