Tetranuclear iron(<scp>iii</scp>) complexes of an octadentate pyridine-carboxylate ligand and their catalytic activity in alkane oxidation by hydrogen peroxide
作者:Elena A. Gutkina、Vladimir M. Trukhan、Cortlandt G. Pierpont、Shaen Mkoyan、Vladimir V. Strelets、Ebbe Nordlander、Albert A. Shteinman
DOI:10.1039/b512069a
日期:——
via the two LH/L ligands to give a “dimer of dimers” structure. Complex 1 assumes a helical shape, with protonated carboxylic acid moieties of the two ligands forming a hydrogen-bonded pair at the center of the cation. In complexes 2, 3 and 4, central carboxylates of the two ligands bridge the iron ions in each of the two Fe2O units, with an interdimer iron–iron separation of approximately 10 Å and
八齿配体2,6-双3- [ N,N-二(2-吡啶甲基甲基)氨基]丙氧基}苯甲酸(LH)与Fe(ClO 4)3的反应导致形成四核配合物[Fe 4(µ-O)2(LH)2(ClCH 2 -CO 2)4 ](ClO 4)4 (1),[Fe 2(µ-O)L(R-CO 2)} 2 ](ClO 4)4 (2 R = C 6 H 5-,3 R = CH3-, 4,R = ClCH 2-)。配合物1和2的晶体结构表明,它们由两个Fe III 2(µ-O)(µ-RCO 2) 2核组成,它们通过两个LH / L配体相连,形成“二聚体二聚体”结构。配合物1呈螺旋状,两个配体的质子化的羧酸部分在阳离子中心形成氢键对。在配合物2, 3和4中,两个配位体的中央羧酸盐弥合铁离子分别在两个铁2O单元,二聚体之间的铁-铁间隔约为10Å,二聚体内的间隔约为3.1Å。Fe 2 O单元内的第二个羧酸酯桥由外源苯甲酸酯(2),乙