SYNTHESIS AND COMPLEXATION STUDIES OFp-TERT-BUTYLCALIX[4]CROWN TELOMERS

Synthesis and binding properties of two polymeric thiacalix[4]arenes

“…By contrast, monomers 1, 2 and 3 are significantly more flexible than are the polymeric ionophores 4a, 4b and 5, and they exhibit poor extraction ability toward metal ions. This is in accordance with our previous works [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48].…”

“…From the results given in Table 1, it has been observed that oligomer 4a shows significant extraction ability toward alkali metal cations, whereas the other compounds (1-3) are ineffective for alkali metal cations in the liquid-liquid extraction systems (Fig. 1), and 4b can be a good adsorbent for alkali metal cations in the solid-liquid batchwise adsorption systems, very likely because of the structural and collective/cooperative behavior of thiacalix [4]arene moieties where the amide bridges and polymeric groups may also play an important role in this situation, which agreed with our previous results [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48]. Table 2 shows that MerrifieldÕs polymer 5 is ineffective for alkali metal cations in the solid-liquid systems.…”

“…As the applications of chemically modified calixarenes/thiacalixarenes, several researchers have attempted to prepare various extractants and chelating adsorbents for alkali/transition metal cations and anions, either by transforming into oligomeric/polymeric structures or by immobilizing them onto solid support materials [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51]. Although quite a number of reports exist on monomeric thiacalixarenes as mentioned above, those on the oligomeric/polymeric thiacalixarenes are very limited.…”

Syntheses and adsorption properties of novel calixarene polymers: Calix[6]-1,4-crown-4-based netty polymers

“…Kim et al [8] observed that the binding abilities of calix [4]crown telomers toward alkali metal and selected transition metal ions are higher than that of monomeric analogue. Yilmaz et al [9][10][11] reported a series of calix [4]crown-based polymers as well as their excellent complexation capabilities. Lately, Chen et al [12] reported the first calix[6]-crown-containing organosilicon resins.…”

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

“…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]. We have also reported the synthesis of calix(aza)crowns and their corresponding oligomers along with their extraction behavior towards toxic metal cations [30].…”