Azacalixarenes: Synthesis, complexation, and structures

Azacalixarenes, which have various N-bound side arms, were synthesized in a one-pot manner in satisfactory yields. Their structures in the solid and solution were elucidated by the NMR spectroscopic method and X-ray crystallographic analyses. Some of them complexed with metal ions (alkali metal, lanthanide, and uranyl ions) under neutral conditions. By the functionalization of the side arms, a wide variety of applications is expected.