Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (09): 1779-1784.doi: 10.3866/PKU.WHXB20090834

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NMR Studies on Interactions between Diperoxovanadate and 1-Ethyl-1H-Imidazole

YU Xian-Yong, PENG Hong-Liang, HUANG Hao-Wen, WANG Zhao-Xu, ZHENG Bai-Shu, LI Xiao-Fang, YI Ping-Gui, CHEN Zhong   

  1. Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education and Hunan Province, 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 of Physical Chemistry of Solid Surface, Fujian Key Laboratory of Plasma and Magnetic Resonance, Department of Physics, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2009-02-10 Revised:2009-04-27 Published:2009-09-03
  • Contact: YI Ping-Gui


To understand the effects of organic ligands on the reaction equilibrium, interactions between a series of diperoxovanadate complexes [OV(O2)2L]- (L=D2O or HOD, the corresponding peroxovanadate species (bpV)) and [OV(O2)2LL']n-{n=1-2; LL'=3-hydroxyl-picolinate (3-OH-pic), 2-(2'-pyridine)-imidazole (py-im), 1,10-phenanthroline (phen), the corresponding peroxovanadate species bpV(3-OH-pic), bpV(py-im), and bpV(phen)}and 1-ethyl-1H-imidazole (N-Et-im) in solution were explored using multinuclear (1H, 13C, and 51V) magnetic resonance, COSY (correlated spectroscopy), HSQC (heteronuclear single quantum coherence) and variable temperature nuclear magnetic responance (NMR) using 0.15 mol·L-1 NaCl ionic medium to mimic physiological conditions. Experimental results indicated that the reactivity of these four complexes with 1-ethyl-1H-imidazole decreased as follows: bpV>bpV(3-OH-pic)>bpV(py-im)>bpV(phen). The coordinating ability, the steric effect, and the molecular weight of these organic ligands affected the reaction equilibrium. A new six-coordinated peroxovanadate species [OV(O2)2(N-Et-im)]- was formed because of competitive coordination.

Key words: NMR, Diperoxovanadate, 1-Ethyl-1H-imidazole, Interactions


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