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Öğe Removal of heavy metal ions from aqueous solution by azocalix[4]arene(TAYLOR & FRANCIS INC, 2011) Karakus, Ozlem Ozen; Elcin, Serkan; Yilmaz, Mustafa; Deligoz, HasalettinThis study presents the preparation, characterization, and sorption properties of new chromogenic azocalix[4]arene based oligomers (1a, 2a and 3a) towards some selected heavy metal (Ag+, Hg+, Hg2+, Co2+, Ni2+, Cu2+, Cd2+ and Cr3+) cations. These compounds have been synthesized via polycondensation reactions involving 25,27-diethylacetoxy-26,28-dihydroxy-5,17-bis(4-nitrophenylazo)calix[4]arene(1), 25,27-diethyl acetoxy-26,28-dihydroxy-5,17-bis(4-ethylphenylazo)calix[4]arene (2), or 25,27-diethyl acetoxy-26,28-dihydroxy-5,17-bis(4-bromophenylazo)calix[4]arene (3) with 1,4-bisamino methyl benzene. Two-phase sorption properties of azocalixarene oligomers (1a, 2a and 3a) towards the selected metal cations are reported. The binding properties of these oligomers towards the selected metal cations were observed to be higher than those of monomeric analogs. It is suggested that this increased binding ability arises from highly rigid azo (-N=N-) group moiety at the upper rim of calix[4]arene in the oligomeric skeleton.Öğe Synthesis and evaluation of fluorescence properties of Cu2+ selective azocalix[4]arenes and their application in living cell imaging(ELSEVIER SCIENCE SA, 2016) Elcin, Serkan; Deligoz, Hasalettin; Bhatti, Asif Ali; Oguz, Mehmet; Karakurt, Serdar; Yilmaz, MustafaThe present article deals with the detailed complexation study along with exploration of possible utilization of 25,26,27,28-tetra-hydroxy-11,23-di-(tert-butyl)-5,17-di-(2-antracenyl)azocalix[4]arene(7) and 25,26,27,28-tetra-hydroxy-11,23-di-(tert-butyl)-5,17-di-(1-pyreneyl)azocalix[4]arene (8) as bio-imaging fluorescent probe to detect Cu2+ in human colon cell line, SW-620, observed by fluorescence microscopy. Complexation properties of ligands 7 and 8 toward selected transition metal ions have been investigated by UV-vis and fluorescence spectroscopies. It has been noticed that ligands 7 and 8 are not only proved to be an efficient Cu2+ selective chromoionophore but also possess effective fluorescence properties by complexing with Cu2+ ions. The FTIR spectroscopic method has also been applied for further confirmation of the complexation phenomenon of ligands 7 and 8 with metal ion and were found to be adequate. Moreover, fluorescence microscopy studies showed that ligand 7 may be used as fluorescent probe to detect Cu2+ in living cells. (C) 2016 Elsevier B.V. All rights reserved.