Spectroscopic and Potentiometric Characterization of Oxovanadium(IV) Complexes Formed by 3-Hydroxy-4-Pyridinones. Rationalization of the Influence of Basicity and Electronic Structure of the Ligand on the Properties of V<sup>IV</sup>O Species in Aqueous Solution
作者:Maria Rangel、Andreia Leite、M. João Amorim、Eugenio Garribba、Giovanni Micera、Elzbieta Lodyga-Chruscinska
DOI:10.1021/ic0605571
日期:2006.10.1
requirements of the substituent on the carbon atom in position 2 of the pyridinone ring. Four new solid derivatives, [V(IV)O(1,2-diethyl-3-hydroxy-4-pyridinonato)2], [V(IV)O(1-(p-tolyl)-2-ethyl-3-hydroxy-4-pyridinonato)2], [V(IV)O(1-(p-(n-butyl)phenyl)-2-ethyl-3-hydroxy-4-pyridinonato)2], and [V(IV)O(1-(p-(n-hexyl)phenyl)-2-ethyl-3-hydroxy-4-pyridinonato)2], were isolated and characterized; they exhibited a five-coordinate
已经使用EPR和UV / vis光谱技术进行了有关由VIVO离子与11种3-羟基-4-吡啶酮衍生物形成的络合物的鉴定和表征的水溶液研究。对于足以溶于水的三个配体(HL)(1-甲基-3-羟基-4-吡啶酮,1-甲基-2-乙基-3-羟基-4-吡啶酮和1,2-二乙基-3-羟基-4-吡啶酮),进行电位滴定; 结果与[V(IV)OL] +,[V(IV)OL2],[V(IV)OL2H(-1)]-,[(V(IV)O)2L2H(-2)的形成一致)]和[V(IV)L3] +物种。双螯合的复合物的特征在于顺式-反式异构体,就顺式排列而言,反式异构体是非常有利的。在CH3COOH中制备了Tris螯合的非羰基V(IV)物质;它们的光谱特征指向ad(z2)基态,以及介于八面体和三棱柱之间的几何形状,这与吡啶酮环2位碳原子上的取代基的空间要求有关。四种新的固体衍生物,[V(IV)O(1,2-二乙基-3-羟基-4-吡啶酮