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■ Synthesis, X-Ray Structure and Metal Extracton Abilities of New Diethyl Phosphate Modified Thiacalix[4]arene

Kunda Uma Maheswara Rao, Takashi Kimuro, Manabu Yamada, Yoshihiko Kondo, and Fumio Hamada*

*Department of Applied Chemistry, Akita University, Tegata-gakuenncho 1-1, Akita 010-0852, Japan

Abstract

New lower rim modified phosphorylated thiacalix[4]arene (TC4A) derivatives such as TC4A-phosphate (2a) and de-t-Bu-TC4A-phosphate (2b) were synthesized. IR, 1H & 31P-NMR and mass spectral and elemental analysis characterized the structures of the synthesized compounds. Single crystal X-ray diffraction measurement reveals that, both the compounds (2a & 2b) stabilized in pinched cone conformation. We also investigated the metal extraction ability of the newly synthesized compounds through solvent extraction technique and these compounds selectively extracted Pd (II) ions from automotive catalyst residue solution containing nine metals.