title: The synthesis and characterization of azocalix[4]arene based chemosensors and investigation of their properties.
abstract: In the present study, azocalix[4]arenes were prepared by linking 4-methoxy, 4-methyl, 4-ethyl, 4-chloro, 4-bromo and 4-nitroaniline to calix[4]arene through a diazo-coupling reaction. A new family of azocalix[4]arene tetraester derivatives, (4a-f), have been prepared with the incorporation of ethyl ester units to azocalix[4]arene. Characterization of the synthesized azocalix[4]arenes was carried using elemental analyses, UV-vis, FT-IR and (1)H NMR spectroscopic techniques. The effect of varying pH levels and solvent types on the absorption ability of azocalix[n]arenes substituted with electron-donating and electron-withdrawing groups was examined. Thermal decomposition of azocalix[4]arene derivatives (4a-f) was investigated by means of thermogravimetry (TG), differential thermogravimetry (DTG) and differential thermal analysis (DTA) analyses. In conclusion of the examination of the extraction we found a selectivity characteristic of these compounds toward Ag(+), Hg(+) and Hg(2+) cations.
authors.affiliation: Department of Chemistry Engineering, Faculty of Engineering, Pamukkale University, 20017 Denizli, Turkey. Electronic address: selcin@pau.edu.tr.
authors.forename: Serkan
authors.initials: S
authors.lastname: Elçin
authors.affiliation: Materials Science and Engineering Department Technology Faculty, Pamukkale University, 20017 Denizli, Turkey.
authors.forename: Gülbanu Koyundereli
authors.initials: GK
authors.lastname: Çılgı
authors.affiliation: Department of Physics, Faculty of Science, Pamukkale University, 20017 Denizli, Turkey.
authors.forename: Alpaslan
authors.initials: A
authors.lastname: Bayrakdar
authors.affiliation: Department of Chemistry Engineering, Faculty of Engineering, Pamukkale University, 20017 Denizli, Turkey.
authors.forename: Hasalettin
authors.initials: H
authors.lastname: Deligöz
mesh_terms: D001391:Azo Compounds / Q000138:chemical synthesis / Q000737:chemistry; D047250:Calixarenes / Q000138:chemical synthesis / Q000737:chemistry*; D002412:Cations / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy; D008628:Mercury / Q000032:analysis*; D008958:Models, Molecular; D010636:Phenols / Q000138:chemical synthesis / Q000737:chemistry*; D012834:Silver / Q000032:analysis*; D012997:Solvents; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry
chemical_list: D001391:Azo Compounds; D002412:Cations; D010636:Phenols; D012997:Solvents; C121325:calix(4)arene; D047250:Calixarenes; D012834:Silver; D008628:Mercury
keywords: Calix[n]arene; Optimized structure; Solvent extraction; TG/DTA; Tetraester