title: 4-tert-butylcalix[4]arene having nitrile pendant groups as Hg²⁺ selective receptors.
abstract: We synthesized a series of 4-tert-butylcalix[4]arene nitriles (5-7) by the reaction of 4-tert-butylcalix[4]arene (1) with 4'-(6-bromohexyloxy)biphenyl-4-carbonitrile (2), 4'-(10-bromode-cyloxy)biphenyl-4-carbonitrile (3), and 4'-(12-bromododecyloxy)biphenyl-4-carbonitrile (4) and characterized their structures, respectively. The extraction abilities of newly synthesized 5-7 toward some selected heavy metal cations, such as Co(2+), Cu(2+), Ni(2+), Zn(2+), Cd(2+), and Hg(2+), were first evaluated and compared by the solvent extraction method. The extraction results revealed that 5-7 were efficient and selective cation receptors for Hg(2+) over-selected cations. On the other hand, the complexation behavior of Hg(2+) with 5-7 was also investigated by using NMR, UV-vis, and IR spectroscopic methods.
authors.affiliation: Selcuk University, Department of Chemistry, 42075 Konya, Turkey. btabakci@selcuk.edu.tr
authors.forename: Begum
authors.initials: B
authors.lastname: Tabakci
authors.forename: Onder
authors.initials: O
authors.lastname: Alici
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Karatas
mesh_terms: D002138:Calibration; D047250:Calixarenes / Q000737:chemistry*; D002413:Cations, Divalent; D004785:Environmental Pollutants / Q000302:isolation & purification*; D008628:Mercury / Q000302:isolation & purification*; D009570:Nitriles / Q000737:chemistry*; D062165:Receptors, Artificial / Q000138:chemical synthesis*; D012680:Sensitivity and Specificity; D012996:Solutions; D012997:Solvents; D014867:Water
chemical_list: D002413:Cations, Divalent; D004785:Environmental Pollutants; D009570:Nitriles; D062165:Receptors, Artificial; D012996:Solutions; D012997:Solvents; D014867:Water; D047250:Calixarenes; D008628:Mercury