Binding properties of p-tert-butyldihomooxacalix[4]arene tetra(2-pyridylmethoxy) derivative towards alkali, alkaline earth, transition and heavy metal cations

Complexation and DFT studies of lower rim hexahomotrioxacalix[3]arene derivatives bearing pyridyl groups with transition and heavy metal cations. Cone versus partial cone conformation

“…Thus, the ionophoric properties of derivatives 1b towards those cations were investigated by the standard picrate extraction method . The results, expressed as a percentage of cation extracted (% E ), are collected in Table , as well as our previous results obtained with derivative analogues 2b and 3b …”

“…Extraction experiments with some alkali and alkaline earth metal cations and tripyridyl derivatives 1b were also performed to compare with the results obtained for the analogues 2b and 3b (Table ) under the same neutral conditions (neutral aqueous picrate solutions) . The extraction of alkali metal cations by 1b had already been carried out, but from alkaline aqueous picrate solutions to CH 2 Cl 2 …”

“…UV absorption spectrophotometry was used to study the interactions between both 1b derivatives and representative transition and heavy metal cations. The results were compared with those obtained for the analogous derivatives 2b and 3b (Table ) …”

“…Following our previous studies on the binding properties of dihomooxacalix[4]arenes bearing pyridyl pendant groups at the lower rim toward a large variety of cations, we have recently extended our research into the study of hexahomotrioxacalix[3]arene derivatives binding affinities towards the same cations. We synthesised the tri(2‐pyridylmethoxy) derivative 1b [20] from p‐tert ‐butylhexahomotrioxacalix[3]arene ( 1a ), in both cone and partial cone conformations.…”

Selective and efficient tripodal receptors for competitive solvent extraction and bulk liquid membrane transport of Hg2+

“…Toxic heavy metals such as mercury, chromium, lead, nickel and cadmium can cause serious problems to the aqueous environment as well as to animals and humans [1][2][3][4][5][6][7][8][9][10][11][12][13]. Therefore, treatment of waste water prior to discharge is essential.…”