Synthesis and binding properties of calix[4]arene 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.…”

“…The solutions were then magnetically stirred in a thermostated water-bath at 25°C for 1 h, and finally left standing for an additional 30 min. The concentration of picrate ion remaining in the aqueous phase was then determined spectrophotometrically as previously described [39][40][41][42]. Blank experiments showed that no picrate extraction occurred in the absence of calixarene.…”

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.…”

“…The solutions were then magnetically stirred in a thermostated water-bath at 25°C for 1 h, and finally left standing for an additional 30 min. The concentration of picrate ion remaining in the aqueous phase was then determined spectrophotometrically as previously described [39][40][41][42]. Blank experiments showed that no picrate extraction occurred in the absence of calixarene.…”

Solvent Extraction of Metal Cations by Chemically Modified Biscalix[4]arenes

“……”

Removal of azo dyes from aqueous solutions using calix[4]arene and β-cyclodextrin

“…These mechanisms are, in general, complicated because they may involve several different interactions [45,48,49]. Some of the reported interactions include: ion-exchange, complexation, coordination/chelation, electrostatic interactions, acidebase interactions, hydrogen bonding, hydrophobic interactions, and physical adsorption.…”

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.…”

“…The solutions were then magnetically stirred in a thermostated water-bath at 25°C for 1 h, and finally left standing for an additional 30 min. The concentration of picrate ion remaining in the aqueous phase was then determined spectrophotometrically as previously described [39][40][41][42]. Blank experiments showed that no picrate extraction occurred in the absence of calixarene.…”

Solvent Extraction of Metal Cations by Chemically Modified Biscalix[4]arenes

“……”

Removal of azo dyes from aqueous solutions using calix[4]arene and β-cyclodextrin

“…These mechanisms are, in general, complicated because they may involve several different interactions [45,48,49]. Some of the reported interactions include: ion-exchange, complexation, coordination/chelation, electrostatic interactions, acidebase interactions, hydrogen bonding, hydrophobic interactions, and physical adsorption.…”

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.…”

“…The solutions were then magnetically stirred in a thermostated water-bath at 25°C for 1 h, and finally left standing for an additional 30 min. The concentration of picrate ion remaining in the aqueous phase was then determined spectrophotometrically as previously described [39][40][41][42]. Blank experiments showed that no picrate extraction occurred in the absence of calixarene.…”

Solvent Extraction of Metal Cations by Chemically Modified Biscalix[4]arenes

“……”

Removal of azo dyes from aqueous solutions using calix[4]arene and β-cyclodextrin

“…These mechanisms are, in general, complicated because they may involve several different interactions [45,48,49]. Some of the reported interactions include: ion-exchange, complexation, coordination/chelation, electrostatic interactions, acidebase interactions, hydrogen bonding, hydrophobic interactions, and physical adsorption.…”