162301-46-4

Upstream product

• 161282-95-7 25,27-dimethoxycalix<4>arene-crown-6 
• 125065-61-4 26,28-dimethoxycalix[4]arene-25,27-diol 
• 41024-91-3 penta(ethylene glycol) bis(p-toluenesulfonate) 
• 151990-25-9 26,28-bis(1-methylethoxy)pentacyclo<19.3.1.1^3,7.1^9,13.1^15,19>-octacosa-1(25),3,5,7(28),9,11,13(27),15,17,19(26),21,23-dodecaene-25,27-diol 
• 75-30-9 2-iodo-propane 
• 162209-37-2 25,27-dihydrpoxycalix<4>arene-crown-6 

Downstream Products

• 1389393-10-5 C₄₆H₅₄CsF₆NO₁₂S₂ 

Relevant academic research and scientific papers

Selectivity of calix[4]arene-crown-6 for cesium ion in ISE: Effect of the conformation

A new series of calix-crowns were used in ion-selective electrodes with two solvents (dibutyl sebacate and o-nitrophenyl octyl ether). As ionophores, the 1,3-dimethoxy and the three different conformers of the 1,3-diisopropoxycalix[4]arene-crown-6 (i.e., 1,3-alternate, partial cone, and cone) were considered. Their behavior toward cesium ion was studied in terms of detection limit (DL), sensitivity (S, mV/pCs), and selectivity toward protons, ammonium, alkali, and alkaline earth metal ions. The lowest DL value was obtained for membranes containing the 1,3-diisopropoxy derivative in the 1,3-alternate conformation. To correlate the analytical results with the structural properties of the ligand and with the nature of the polymeric membrane, a multifactor ANOVA with interactions was carried out on selectivities toward univalent and divalent ions. As for the alkali metal ions, a highly significant negative correlation (p CS/Mpot values and the ionic radius was found; in addition, for the smaller ions H+, Li+, and Na+, the four ionophores showed higher differences in selectivity than for the larger ions K+ and Rb+ as well as for alkaline earth metal ions. Better results than those previously reported with other ligands in terms of DL (5 × 10-7 M) and pKCs/Mpot (4.46) were found for the 1,3-diisopropoxycalix-[4]arene-crown-6 in the 1,3-alternate conformation.

Synthesis, complexation, and membrane transport studies of 1,3-alternate calix[4]arene-crown-6 conformers: A new class of cesium selective ionophores

1,3-Dialkoxycalix[4]arene-crown-6 ionophores (4a-d) are obtained in the fixed 1,3-alternate conformation in 63-85% yield by the reaction of the corresponding 1,3-dialkoxycalix[4]arenes 3a-d with pentaethylene glycol ditosylate in CH3CN in the p