Citation:
	            
		            YU  Xian-Yong, PENG  Hong-Liang, HUANG  Hao-Wen, WANG  Zhao-Xu, ZHENG  Bai-Shu, LI  Xiao-Fang, YI  Ping-Gui, CHEN  Zhong. NMR Studies on Interactions between Diperoxovanadate and 1-Ethyl-1H-Imidazole[J]. Acta Physico-Chimica Sinica,
							;2009, 25(09): 1779-1784.
						
							doi:
								10.3866/PKU.WHXB20090834
						
					
				
					
				
	        
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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.
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								Keywords:
								
 - 
												
NMR
, - Diperoxovanadate,
 - 1-Ethyl-1H-imidazole,
 - Interactions
 
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