title: On-line preparation of peroxymonocarbonate and its application for the study of energy transfer chemiluminescence to lanthanide inorganic coordinate complexes.
abstract: It has been shown that peroxymonocarbonate ion (HCO(4) (-)) is a potent oxidant. In this study, a flow-injection system was developed in order to prepare on-line HCO(4) (-) ion and the optimum conditions for the on-line preparation of HCO(4) (-) were studied in detail. We used 99% (13)C-enriched NaHCO(3) to examine peroxymonocarbonate by (13)C-NMR at 25 degrees C. An ultra-weak chemiluminescence (CL) was observed after mixing H(2)O(2) and sodium bicarbonate in an organic co-solvent that can accelerate the formation of HCO(4) (-) ion. When lanthanide inorganic coordinate complex, Eu(II)-EDTA, was added into this HCO(4) (-) system, the CL intensity was significantly enhanced. The CL mechanism was investigated by various methods. The experimental results indicate that peroxymonocarbonate oxidizes Eu(II) to Eu(III) and produces singlet oxygen; meanwhile, the energy originating from dimers of singlet oxygen is accepted by the Eu(III)-EDTA(-) complex. The excited Eu(III) ions undergo radiative deactivation and emit CL.
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, PO Box 2871, 100085 Beijing, China.
authors.forename: Meilin
authors.initials: M
authors.lastname: Liu
authors.forename: Xianglei
authors.initials: X
authors.lastname: Cheng
authors.forename: Lixia
authors.initials: L
authors.lastname: Zhao
authors.forename: Jin-Ming
authors.initials: JM
authors.lastname: Lin
mesh_terms: D002254:Carbonates / Q000737:chemistry*; D002412:Cations; D019281:Dimerization; D004492:Edetic Acid / Q000737:chemistry / Q000494:pharmacology; D004735:Energy Transfer; D005063:Europium / Q000737:chemistry / Q000494:pharmacology; D017022:Flow Injection Analysis; D006861:Hydrogen Peroxide / Q000737:chemistry / Q000494:pharmacology; D007700:Kinetics; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D049449:Luminescence; D008163:Luminescent Measurements; D009682:Magnetic Resonance Spectroscopy; D009930:Organic Chemicals / Q000737:chemistry; D026082:Singlet Oxygen / Q000737:chemistry; D017693:Sodium Bicarbonate / Q000737:chemistry / Q000494:pharmacology; D012997:Solvents / Q000737:chemistry
chemical_list: D002254:Carbonates; D002412:Cations; D028581:Lanthanoid Series Elements; D009930:Organic Chemicals; D012997:Solvents; C512862:peroxycarbonic acid; D026082:Singlet Oxygen; D005063:Europium; D017693:Sodium Bicarbonate; D004492:Edetic Acid; D006861:Hydrogen Peroxide