Analytical evaluation of Cu2+ selective behavior of calix[4]arene derivative.

The present article describes the solvatochromic effect including solvent system selection, time study and a detailed complexation study along with exploration of extraction properties of 5,11,17,23-tetrakis[(diethylamino)methyl]-25,26,27,28-tetrahydroxycalix[4]arene (4) that bears nitrogen atom as a donor group available for chelating metal ions. Complexation properties of 4 toward selected transition metal ions have been investigated by UV-visible and fluorescence spectroscopies. The% efficiency of 4 toward selected transition metal ions was found in order Cu(2+)>Ni(2+)>Hg(2+)>Zn(2+)>Co(2+)>Cd(2+)>Pb(2+). It has been noticed that 4 is not only proved to be an efficient Cu(2+) selective chromoionophore but also possesses an effective extraction property for transferring Cu(2+) ions from an aqueous to dichloromethane layer. The FT-IR spectroscopic method has also been applied for further confirmation of the complexation phenomenon of 4 with Cu(2+) ion and found adequate. © Springer Science+Business Media, LLC 2011