Synthesis of a tetrahomodioxacalix[4]arene tetraamide and the crystal structure of its lead ion complex.
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+.
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K H
KH
Department of Chemistry, Sookmyung Women's University, Seoul 140-742, Korea.
Kim
J S
JS
Shon
O J
OJ
Yang
S H
SH
Suh
I H
IH
Kim
J G
JG
Bartsch
R A
RA
Kim
J Y
JY