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Citation: YU Xian-Yong, LI Guo-Bin, ZHENG Bai-Shu, HUANG Hao-Wen, YI Ping-Gui, ZENG Yun-Long, CHEN Zhong. NMR Studies on Interactions between Diperoxovanadate and Imidazole-like Ligands[J]. Acta Physico-Chimica Sinica, ;2007, 23(11): 1765-1770. doi: 10.3866/PKU.WHXB20071121 shu

NMR Studies on Interactions between Diperoxovanadate and Imidazole-like Ligands

1.
Hunan Province College Key Laboratory of QSAR/QSPR, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan Province, P. R. China; State Key Laboratory for Physical Chemistry of Solid Surface, Xiamen University, Xiamen 361005, Fujian Province, P. R. China

Received Date: 8 May 2007
Available Online: 6 October 2007

To understand the substituting effects of imidazole ring on the reaction equilibrium, the interactions between diperoxovanadate complex NH4[OV(O2)2{2-(2’-Pyridine)-Imidazole}]·4H2O (abbr. bpV(Imi-Py)) and a series of imidazole-like ligands (imidazole, 2-methyl-imidazole, 4-methyl-imidazole, and histidine) in solution were explored usingmultinuclear (1H, 13C, and 51V)magnetic resonance, diffusionordered spectroscopy (DOSY), and variable temperature NMR in 0.15 mol·L -1 NaCl ionic medium for mimicking the physiological conditions. The experimental results indicatedthat the activities of bpV(Imi-Py) and organic ligandswere as follows: imidazole≈4-methyl-imidazole>2-methyl-imidazole>histidine. The steric effect of the organic ligands affects the reaction equilibrium. At the same time, newsix-coordinated peroxovanadate species [OV(O2)2L]- (L= imidazole-like ligands) were formed due to the competitive coordination between 2-(2’-pyridyl)-imidazole and the imidazole-like ligands. When the ligand was 4-methyl-imidazole or histidine, a pair of isomers was formed.
- Diperoxovanadate complex; Imidazole-like ligands; Interactions; NMR
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