Homo- and heteropolynuclear helicates with a ‘2 + 3 + 2’-dentate compartmental ligand
作者:Stephen P. Argent、Harry Adams、Lindsay P. Harding、T. Riis-Johannessen、John C. Jeffery、Michael D. Ward
DOI:10.1039/b502423d
日期:——
An octadentate ligand L has been prepared which contains a sequence of bidentate (pyrazolyl-pyridine), terdentate [bis(pyrazolyl)pyridine] and bidentate (pyrazolyl-pyridine) binding sites separated by p-xylyl spacers. This forms a range of double helical complexes in which the two ligands define 4-, 6-, and 4-coordinate binding sites, and there is substantial π-stacking between overlapping parallel
已经制备了八齿配体L,其包含被对-二甲苯基间隔物分开的二齿(吡唑基-吡啶),三齿[双(吡唑基)吡啶]和二齿(吡唑基-吡啶)结合位点的序列。这形成了一系列双螺旋复合物,其中两个配体限定了4-,6-和4-配位的结合位点,并且在配体的重叠平行区域之间存在大量的π-堆积。在[Cu 3 L 2 ] [PF 6 ] 4中,铜离子的氧化态顺序为+ 1,+ 2,+ 1,其中Cu(I)离子在末端位点为四配位,而Cu(II)位于中央的六坐标站点。在[Cu 3(OAc)2 L 2 ] [PF 6 ] 4所有铜中心的氧化态均为+2,且末端离子具有额外的单齿乙酸酯配体,使它们具有五坐标几何形状。配位数的4 + 6 + 4排列意味着L与Fe( II)和Ag( I)的混合物反应导致形成高产率的[Ag 2 FeL 2 ] [BF 4 ] 4,其中Ag( I)离子占据了末端4坐标位,而Fe( II)占据了中央伪八面体位。L与Ag(