1. Investigation on the complex of diperoxovanadate with 2-(2′-pyridyl)-imidazole
- Author
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Yu, Xian-Yong, Cai, Shu-Hui, and Chen, Zhong
- Subjects
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IMIDAZOLES , *NUCLEAR magnetic resonance , *X-ray diffraction , *SPACE groups , *IONS , *MOLECULES , *HYDROGEN bonding , *GEOMETRY , *LIGANDS (Biochemistry) - Abstract
Abstract: A novel diperoxovanadate complex NH4[OV(O2)2{2-(2′-pyridyl)-imidazole}]·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) Å, β =104.695(5), V =1570.3(8) Å3 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. [Copyright &y& Elsevier]
- Published
- 2005
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