title: Thiaoxaaza-macrocyclic chromoionophores as mercury(II) sensors: synthesis and color modulation.
abstract: Azo-coupled macrocyclic chromoionophores incorporating benzene (L(1)) and pyridine (L(2)) subunits were synthesized, respectively. In a cation-induced color change experiment, both receptors showed Hg(2+) selectivity. However, L(1) gave a larger cation-induced hypsochromic shift than L(2), suggesting that the presence of the pyridine unit in L(2) may inhibit the Hg...N-azo interaction. The observed Hg(2+)-selective color changes for L(1) and L(2) were found to be controlled by anion-coordination ability. NMR titration of the proposed receptor ligand with Hg(II) salt was accomplished.
authors.affiliation: Department of Chemistry (BK21) and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, South Korea.
authors.forename: Hayan
authors.initials: H
authors.lastname: Lee
authors.forename: Shim Sung
authors.initials: SS
authors.lastname: Lee
mesh_terms: D001391:Azo Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D001555:Benzene Derivatives / Q000138:chemical synthesis* / Q000737:chemistry; D003124:Colorimetry; D018360:Crystallography, X-Ray; D008024:Ligands; D008628:Mercury / Q000737:chemistry*; D008968:Molecular Conformation; D015394:Molecular Structure; D011725:Pyridines / Q000138:chemical synthesis* / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet
chemical_list: D001391:Azo Compounds; D001555:Benzene Derivatives; D008024:Ligands; D011725:Pyridines; D008628:Mercury