title: Investigation on the complex of diperoxovanadate with 2-(2'-pyridyl)-imidazole.
abstract: A novel diperoxovanadate complex NH4[OV(O2)2{2-(2'-pyridyl)-imidazole}] x 4H2O was synthesized in aqueous solution under physiological conditions. The solution structure of the complex was characterized by multinuclear (1H, 13C, 14N, and 51V) as well as multi-dimensional (DOSY and C-H COSY) NMR techniques in the interaction system of NH4VO3/H2O2/2-(2'-pyridyl)-imidazole at room temperature. The crystal structure of the complex was determined at 173K by single-crystal X-ray diffraction method. It belongs to the monoclinic space group P21/c with a = 13.048(4), b = 6.984(2), c = 17.814(5) A, beta = 104.695(5), V = 1570.3(8) A3 and Z = 4. The crystal is composed of ammonium ions, {2-(2'-pyridyl)-imidazole}oxodiperoxovanadate(V) ions, and water molecules, which are held together by ionic and hydrogen bond forces. The metal atom in the complex is seven-coordinated with a distorted pentagonal bipyramidal geometry. It is the first mononuclear diperoxovanadate complex with a N, N'-chelating biheteroaromatic ligand and its 51V chemical shift is at the highest field among the known mononuclear diperoxovanadate(V) complexes.
authors.affiliation: Department of Physics, State Key Laboratory of Physical Chemistry of Solid Surface, Xiamen University, Xiamen, Fujian, 361005, PR China.
authors.forename: Xian-Yong
authors.initials: XY
authors.lastname: Yu
authors.forename: Shu-Hui
authors.initials: SH
authors.lastname: Cai
authors.forename: Zhong
authors.initials: Z
authors.lastname: Chen
mesh_terms: D007093:Imidazoles / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D009942:Organometallic Compounds / Q000737:chemistry*; D010545:Peroxides / Q000737:chemistry*; D013696:Temperature; D014638:Vanadates / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D007093:Imidazoles; D009942:Organometallic Compounds; D010545:Peroxides; C505739:ammonium oxodiperoxo(2-(2'-pyridyl)imidazole)vanadate(III); C091767:diperoxovanadate; D014638:Vanadates