title: Synthesis of a tetrahomodioxacalix[4]arene tetraamide and the crystal structure of its lead ion complex.
abstract: The 1,4-alternate tetrahomodioxacalix[4]arene tetraamide 4 with four p-phenyl groups on its upper rim was synthesized. In two-phase metal picrate extraction, 4 exhibited Pb2+ selectivity with formation of a 1:1 complex in chloroform. In the solid-state structure of the 4*Pb(Pic)2 complex, Pb2+ is bound by the carbonyl oxygens of two adjacent amide groups and an aryl-alkyl ether oxygen atom of one of these amide-containing substituents. The crystal structure and 1H NMR spectrum of the 4*Pb2+ complex reveals pi-metal ion complexation of one aromatic ring in the ligand with Pb2+.
authors.affiliation: Department of Chemistry, Sookmyung Women's University, Seoul 140-742, Korea.
authors.forename: K H
authors.initials: KH
authors.lastname: No
authors.forename: J S
authors.initials: JS
authors.lastname: Kim
authors.forename: O J
authors.initials: OJ
authors.lastname: Shon
authors.forename: S H
authors.initials: SH
authors.lastname: Yang
authors.forename: I H
authors.initials: IH
authors.lastname: Suh
authors.forename: J G
authors.initials: JG
authors.lastname: Kim
authors.forename: R A
authors.initials: RA
authors.lastname: Bartsch
authors.forename: J Y
authors.initials: JY
authors.lastname: Kim