The debenzylation and selective de-tert-butylation of p-tert-calix[4]arene derivatives were studied and 11, 17, 23-tri-tert-butyl-25, 26, 27-tri-O-etherated calix[4] arenes were synthesized by a simultaneous debenzyla...The debenzylation and selective de-tert-butylation of p-tert-calix[4]arene derivatives were studied and 11, 17, 23-tri-tert-butyl-25, 26, 27-tri-O-etherated calix[4] arenes were synthesized by a simultaneous debenzylation and selective de-tert-butylation process.展开更多
Reaction of p-t-butylcalix[6]arene with ethylene oxide gives a water soluble host compound with a hydrophobic cavity and it can include organic molecules and ions in aqueous solution.
Extraction of sulphonated dyes through supramolecular interaction with calix[4]arene derivatives is being presented here. The selectivity of calixarene derivatives namely piperidine derivative of calix[4]arene (calix-...Extraction of sulphonated dyes through supramolecular interaction with calix[4]arene derivatives is being presented here. The selectivity of calixarene derivatives namely piperidine derivative of calix[4]arene (calix-1), 1-methyl piperazine derivative of calix[4]arene (calix-2), and di-methyl amine derivative of calix[4]arene (calix-3) were evaluated initially against reactive red 2 (RR-2), acid black (AB), reactive blue 19 (B-19) and synthetic dye (D-2) by liquid-liquid extraction experiment. The results showed that the above three calixarenes possess excellent complexation abilities toward the selected dyes. The stoichiometric ratio for the calixarene derivatives and dyes was estimated through Job’s plot, whereas Hildebrand-Benesi equation was used to calculate formation constant (K<sub>s</sub>) and molar absorptivity (Δε) of complexes. The binding association (K<sub>a</sub>) and dissociation (K<sub>d</sub>) constants were calculated by Scatchard plot additionally to further support the complexation data obtained from Hildebrand-Benesi equation. Conversely association constants from, both Hildebrand-Benesi equation and Scatchard plot i.e. K<sub>s</sub> and K<sub>a</sub> favor strong binding interaction between calix-1: D-2, calix-2: B-19, and calix-3: AB complexes. Thus present study adeptly supports the complexation of calixarene derivatives for sulfonated dyes.展开更多
基金Project supported by the National Natural Science Foundation of China (No. 29872041) and the Analytical Centre of Nanjing University.
文摘The debenzylation and selective de-tert-butylation of p-tert-calix[4]arene derivatives were studied and 11, 17, 23-tri-tert-butyl-25, 26, 27-tri-O-etherated calix[4] arenes were synthesized by a simultaneous debenzylation and selective de-tert-butylation process.
文摘Reaction of p-t-butylcalix[6]arene with ethylene oxide gives a water soluble host compound with a hydrophobic cavity and it can include organic molecules and ions in aqueous solution.
文摘Extraction of sulphonated dyes through supramolecular interaction with calix[4]arene derivatives is being presented here. The selectivity of calixarene derivatives namely piperidine derivative of calix[4]arene (calix-1), 1-methyl piperazine derivative of calix[4]arene (calix-2), and di-methyl amine derivative of calix[4]arene (calix-3) were evaluated initially against reactive red 2 (RR-2), acid black (AB), reactive blue 19 (B-19) and synthetic dye (D-2) by liquid-liquid extraction experiment. The results showed that the above three calixarenes possess excellent complexation abilities toward the selected dyes. The stoichiometric ratio for the calixarene derivatives and dyes was estimated through Job’s plot, whereas Hildebrand-Benesi equation was used to calculate formation constant (K<sub>s</sub>) and molar absorptivity (Δε) of complexes. The binding association (K<sub>a</sub>) and dissociation (K<sub>d</sub>) constants were calculated by Scatchard plot additionally to further support the complexation data obtained from Hildebrand-Benesi equation. Conversely association constants from, both Hildebrand-Benesi equation and Scatchard plot i.e. K<sub>s</sub> and K<sub>a</sub> favor strong binding interaction between calix-1: D-2, calix-2: B-19, and calix-3: AB complexes. Thus present study adeptly supports the complexation of calixarene derivatives for sulfonated dyes.
