Synthesis and binding properties of polymeric calix[4]arene nitriles

The synthesis and metal cation extraction studies of novel polymer-bound calix(aza)crowns

“…The percent extraction (E%) has been calculated as E% ¼ ðA 0 À AÞ=A 0 Â 100 where A 0 and A are initial and final concentrations of metal picrate before and after the extraction, respectively. The metal picrates were prepared according to previous studies [15][16][17][18].…”

“…The complexation properties of these molecules appear to be highly dependent upon the nature, number of donor groups, and the conformation of the calix [4]arene moiety [11][12][13][14]. The interesting properties shown by these cyclic oligomeric molecules stimulated the exploitation of useful methods towards their incorporation into polymeric matrices, which are interesting for the development of ion selective electrodes and membranes, chemical and biochemical sensors and selective extraction of ions and neutral molecules [15][16][17][18][19]. Previously, to increase the affinity of calixarenes toward metal ions and anions, two main strategies have been followed: first, different ionophoric groups including carbonyl, amide, and nitrile have been incorporated onto the calixplatform; second, the calixarene units have been fixed in a polymeric matrix [20][21][22][23][24][25][26][27][28][29].…”

Pb2+ adsorption behavior of calix[4]arene based Merrifield Resin

“…Due to their enormous applications, they have motivated scientists by synthesizing variety of derivatives; this can be done by incorporating different functionalities either at hydrophilic phenolic group or inserting at hydrophobic site, these molecules possess flexibility, different shapes and conformations [26,27]. Moreover, due to their three dimensional structure and fascinating characteristics they have motivated the development of useful methods resulting in the form of polymeric matrices, membranes, ion selective electrodes, sensors for chemical and biochemical processes and ionophores for selective extraction of toxic heavy metal ions [28][29][30][31][32].…”

Adsorption of amino acid derivatives on calixarene carboxylic acid impregnated resins

“…Consequently, immobilization of calixarene derivatives on polymer matrix has been performed for the recovery of metal ions [17]. Crosslinking of calixarene to polymers has been carried out [18][19][20][21], as well as copolymerization of calixarene with other monomers [22][23][24][25]. Furthermore, impregnation of resins with calixarene derivatives is also one of the recognized methods for immobilization of calixarenes.…”