Abstract
A series of cyclic phospha-crown ethers was synthesized through a cyclisation reaction. These compounds were shown to extract alkali metals, ammonium, strontium and calcium ions from the aqueous phase to the organic one. The selectivity in partitioning varied with the relative fit of the ionic radius of the metal ion with the whole size of the macrocycle. For a typical phospa-crown-metal ion combination, the formation of a 1:1 complex was suggested by UV spectroscopy investigation.
Cuvinte cheie
extraction; transport; ionophores; alkali picrates; phosphacrown ethers
bathochromic