title: Mercury ions complexation with a series of heterocyclic derivatives of 3-hydroxychromone: spectral effects and prospects for ultrasensitive Hg2+ probing.
abstract: Complexation of three 3-hydroxychromone derivatives bearing a nitrogen-containing heterocyclic moiety in the position 2 of the chromone bicycle - benzimidazole, quinoline, and 2,5-diphenyloxazole, with mercury(II) ions is reported. Formation of chelate complexes with the metal cations coordinated with the cavity formed by 3-OH and 4-C═O groups was shown, as well as the possibility of side moiety heteroatom participation in binding of metal ions. High sensitivity to mercury of 2,5-diphenyloxazole-substituted 3-hydroxychromone was elucidated, allowing to detect Hg(2+) below the maximum permissible concentration for drinking water. This makes the above-mentioned compound a prospective basis for development of sensors for ultralow mercury concentration detection in water. Unusual fluorescence ignition of 2-(quinolin-2-yl)-3-hydroxychromone at low Hg(2+) concentrations, rarely observed for heavy metals ions complexation with organic fluorescent ligands, was discussed.
authors.affiliation: Institute for Chemistry, Kharkov V N Karazin National University, Kharkov, Ukraine.
authors.forename: Denis
authors.initials: D
authors.lastname: Svechkarev
authors.forename: Bogdan
authors.initials: B
authors.lastname: Dereka
authors.forename: Andrey
authors.initials: A
authors.lastname: Doroshenko
mesh_terms: D002867:Chromones / Q000737:chemistry*; D006571:Heterocyclic Compounds / Q000737:chemistry*; D007477:Ions / Q000032:analysis; D008628:Mercury / Q000032:analysis*; D015394:Molecular Structure; D009941:Organomercury Compounds / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: C479534:3-hydroxychromone; D002867:Chromones; D006571:Heterocyclic Compounds; D007477:Ions; D009941:Organomercury Compounds; D008628:Mercury