title: Hg(II) selective complexation by chromoionophoric calix[4]arene derivative.
abstract: The present article describes an exploration regarding Hg(II) selective complexation behavior of 5,11,17,23-tetrakis[(N,N-dimethylamino)methyl]-25,26,27,28-tetrahydroxycalix[4]arene (4). The binding affinity of 4 toward selected transition metal ions such as Cd(II), Co(II), Cu(II), Hg(II), Ni(II), Pb(II) and Zn(II) have been investigated by UV-visible and fluorescence spectroscopies. From the results it has been noticed that 4 confers a pronounced preference for Hg(II) in complexation phenomenon even in the presence of other metal ions. The results of Job's plot analysis reveal 1:1 host-guest complex formation between Hg(II) and 4. The FT-IR spectroscopy also supports the complexation affinity of 4 for Hg(II).
authors.affiliation: National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan.
authors.forename: Mansoor Ahmed
authors.initials: MA
authors.lastname: Qazi
authors.forename: Imdadullah
authors.initials: I
authors.lastname: Qureshi
authors.forename: Shahabuddin
authors.initials: S
authors.lastname: Memon
mesh_terms: D001665:Binding Sites; D047250:Calixarenes / Q000737:chemistry*; D002412:Cations; D008628:Mercury / Q000737:chemistry*; D008670:Metals; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D028561:Transition Elements
chemical_list: D002412:Cations; D008670:Metals; D028561:Transition Elements; D047250:Calixarenes; D008628:Mercury