Synthesis of two calix[4]arene diamide derivatives for extraction of chromium(VI)

Coordination chemistry of calix[4]arene derivatives with lower rim functionalisation and their applications

“…91 [184]. They have previously found that amine base derivatives of calix [4]arenes are very effective towards chromate and dichromate anions [185,186].…”

Immobilization of novel the semicarbazone derivatives of calix[4]arene onto magnetite nanoparticles for removal of Cr(VI) ion

“…form and pKa 1 and pKa 2 values of these equations are 0.74 and 6.49, respectively. It is apparent to us that the ligands 4-6 form complex mostly with HCr 2 O 7 - [35,36].…”

“…Thermal properties of APTES-modified It is known that calix [4]arenes with a nitrogen functionality for oxoanions [35][36][37]. For this purpose we have designed receptors having semicarbazone derivatives of calix [4]arene-based magnetic nanoparticles and performed some preliminary evaluations to investigate binding efficiencies of the extractants MN-C1, MN-C2 and MN-C3 for Na 2 Cr 2 O 7 by solid-phase extraction at different pHs.…”

Synthesis and dichromate anion sorption of silica gel-immobilized calix[4]arenes

“…We have previously reported the synthesis of calix [4]arenebased receptors as novel extractants [19,20], sorbents [21] and membrane transport carriers for anions [22] and cations [23,24]. We now report the synthesis and efficiency of new covalently linked calixarene-based polymers with amide functionality as solid phase and column materials for the removal of Cr(VI) from aqueous solutions.…”