MACROCYCLIC MONO AND DIPHOSPHA-CROWN ETHERS AND
THEIR COMPLEXING PROPERTIES
A. Hannioui1*, A. El Malki1, N. Knouzi2, M. B. El Malouli3, M. Berrada2
1Université Cadi Ayyad, FST Béni-Mellal, B.P.523 Béni-Mellal. Morocco
2Université Hassan II, Faculté Des Sciences Sidi Othmane, BP6023, Casablanca, Morocco
3Université Hassan II Faculté Des Sciences Ain Chock, Maârif, B.P.5366, Casablanca, Morocco
Université Hassan II, Faculté Des Sciences Sidi Othmane, BP6023, Casablanca, Morocco
* Corresponding author. E-mail : email@example.com
Received : 12 February 2002; revised version accepted : 10 June 2002
A series of cyclic phospha-crown ethers was synthesised 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 hole 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.
Keywords: Extraction; Ionophores; Alkali picrates; bathochromic; Phospha-crown ethers.