CMPO-calix[4]arenes with spacer containing intramolecular hydrogen bonding: Effect of local rigidification on solvent extraction toward f-block elements

- Three CMPO-calix[4]arenes with spacer containing intramolecular hydrogen bonds were designed and synthesized.
- The influence of local rigidification caused by intramolecular hydrogen bonds upon extraction of f-elements was investigated.
- Selective extraction is realized via tuning local chelating surroundings by aid of intramolecular hydrogen bonds.