Electrochemistry of molybdenum(VI)–catecholamide siderophore complexes in aqueous solution
作者:Anne-Kathrin Duhme-Klair、D.Chanaka L de Alwis、Franklin A Schultz
DOI:10.1016/s0020-1693(03)00210-x
日期:2003.7
Complexes of molybdenum(VI) with the catecholamide siderophore ligands aminochelin, azotochelin and protochelin undergo electrochemical reduction by sequential Mo(VI)→Mo(V) and Mo(V)→Mo(III) electron transfers in pH 5.40–6.74 pyridine (py) buffer in a manner closely analogous to the cis-dioxo Mo(VI)–catechol complex, MoO2(cat)2 2−. The pH dependence of the electrode half-reaction potentials for Mo–azotochelin
钼(VI)与儿茶酚酰胺铁载体配体氨基螯合素,偶氮螯合素和原螯合素的络合物通过在pH 5.40–6.74吡啶中依次进行Mo(VI)→Mo(V)和Mo(V)→Mo(III)电子转移进行电化学还原)缓冲液,其方式与顺式-二氧杂Mo(VI)-邻苯二酚络合物MoO 2(cat)2 2-相似。Mo-偶氮螯合素和Mo-氨基螯合素的电极半反应电位的pH依赖性表明,一到两个质子与Mo(VI)结合转移到Mo(V)还原,两到三个质子与Mo结合(V)还原为Mo(III)。看来在Mo V O(OH)中,配位的H 2 O上质子的酸度2)(L)2 -产物是通过在铁载体的配体的取代基酰胺增强。电极电位随着py浓度的增加而向正方向移动,这与一个py与Mo(V)和两个py与Mo(III)的配位相一致。Mo-铁载体的Mo(VI)/ Mo(V)和Mo(V)/ Mo(III)势相对于Ag / AgCl(-0.2)处于-0.45--0