Tetrahedron p. 3487 - 3496 (1997)
Update date:2022-08-10
Topics:
Tsukube, Hiroshi
Shinoda, Satoshi
Mizutani, Yoshihisa
Okano, Masateru
Takagi, Kentaro
Hori, Kenzi
A variety of double armed crown ether were prepared in which amine, amide, ester, nitrile and pyridine moieties were attached as cation-ligating sidearms to diaza-12-crown-4 ring. FAB-MS and 7Li/13C/23Na NMR binding and liquid membrane transport studies revealed that mast of them exhibited Li+ cation selectivity, though corresponding single armed lariat ethers showed Na+ cation selectivity. Among them, amine-armed diaza-12-crown-4 derivative offered the highest Li+ ion-selective ionophoric property. its transport efficiency and selectivity were particularly superior to those of commercially available Li+ ion-selective ionophores.
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