Calix[4]resorcinarene and alkylaminomethylated calix[4]resorcinarene-mediated transport of some metal complexes through chloroform bulky liquid membrane

Spectrophotometry and pH measurements were used to study the non-substitute d and ortho-substituted calix[4]resorcinarene-mediated transport of Cu(II) and Co(Ill) complexes with diamine and amino acids from an aqueous source p hase to an aqueous receiving phase through a bulky chloroformic membrane. T he non-substituted derivative was found to extract complex cations as the a nionic ionophore, exchanging protons for the complex across the phase bound ary. That is why the reextraction is not effective without acidifying of th e receiving phase. The ortho-substituted calix[4]resorcinarenes extract com plexes in the form of ionic pairs, which in turn promote their reextraction . into receiving phase. (C) 2001 Published by Elsevier Science B.V.