Sayin, SerkanYilmaz, MustafaTavasli, Mustafa2020-03-262020-03-2620110040-4020https://dx.doi.org/10.1016/j.tet.2011.03.012https://hdl.handle.net/20.500.12395/26859The synthesis of two new calixarene derivatives 4 and 5, functionalized at the lower rim with 4-amino-1-benzylpiperidine to give diamide and diamine derivatives of p-tert-butylcalix[4]arene, is described. They were obtained by the reaction of both the diester derivative of p-tert-butylcalix[4]arene (2) and the dialkyl bromide derivative of p-tert-butylcalix[4]arene (3) with 4-amino-1-benzylpiperidine. The (1)H NMR spectra of calixarene derivatives show that 4 and 5 exist in the cone conformation. Moreover, these diamide and diamine derivatives of p-tert-butylcalix[4]arene (4 and 5) have been immobilized onto 13-(2,3-epoxypropoxy)-Propyl]-trimethoxysilane-modified Fe(3)O(4) magnetite nanoparticles to obtain calixarene-based magnetic nanoparticles M-DADBP-Calix (6) and M-DABP-Calix (7). The calix[4]arene immobilized materials were characterized by a combination of Fourier Transform Infrared Spectroscopy (FTIR), Transmission Electron Microscopy (TEM) and Thermogravimetric Analyses (TGA) and elemental analysis. Additionally, the studies regarding the removal of As(V)/Cr(VI) ions as well as U(VI) ion from aqueous solutions were also carried out by using these compounds in liquid liquid/solid liquid extraction experiments. (C) 2011 Elsevier Ltd. All rights reserved.en10.1016/j.tet.2011.03.012info:eu-repo/semantics/closedAccessCalix[4]areneMagnetite nanoparticlesExtractionArsenate/dichromateUranylArticle672037433753Q2WOS:000290889600019Q2