title: Spectroscopic studies on the interactions between a bioactive diperoxovanadate complex and pyridine.
abstract: Interactions between a bioactive diperoxovanadate complex K3[OV(O2)2(C2O4)].H2O and pyridine in solution were studied by 2D NMR diffusion ordered spectroscopy (DOSY) as well as 1D 1H, 13C, 14N, and 51V NMR, variable temperature 1H NMR and spin-lattice relaxation time. Competitive coordination between C2O(4)(2-) and pyridine to [OV(O2)(2)](-) were observed in solution. A new species [OV(O2)2(Py)](-) was formed and its NMR data were reported for the first time. The experimental results indicated that both of the vanadium atom in species [OV(O2)2(C2O4)](3-) and [OV(O2)2(Py)](-) are six coordinated in solution. The conclusion was further supported by the results of ESI-MS. The newly-formed species is stable under the condition of near physiological pH value.
authors.affiliation: Departments of Chemistry and Physics, State Key Laboratory for Physical Chemistry of Solid Surface, Xiamen University, Xiamen 361005, People's Republic of China.
authors.forename: Xianyong
authors.initials: X
authors.lastname: Yu
authors.forename: Shuhui
authors.initials: S
authors.lastname: Cai
authors.forename: Zhong
authors.initials: Z
authors.lastname: Chen
mesh_terms: D002467:Cell Nucleus / Q000378:metabolism; D004058:Diffusion; D000431:Ethanol / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008956:Models, Chemical; D008958:Models, Molecular; D010545:Peroxides / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D013053:Spectrophotometry / Q000379:methods*; D014638:Vanadates / Q000737:chemistry*; D014639:Vanadium / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D010545:Peroxides; D011725:Pyridines; C091767:diperoxovanadate; D014639:Vanadium; D014867:Water; D000431:Ethanol; D014638:Vanadates; C023666:pyridine