Redox-active nanoscale racks and nanoladders were prepared as proof of principle in a directional heteroleptic approach towards internally functionalised aggregates. Using the HETTAP concept, zinc(II) phenanthroline terpyridine nanoladder and nanorack structures with internal ferrocene units were prepared. Proximal effects exerted by the ferrocene units in the nanoladders could be read out by comparison of their redox potentials with those of nanorack R1 and of the parent ligand. The increasing compression of the ferrocene units when going from the larger nanoladder L1 to the smaller aggregate L2 manifested itself in an enlarged anodic shift. Thus, the redox potential series (vs. DMFc: E1/2 = 0.462 V for R1, 0.480 V for L1 and 0.491 V for L2) reveals convincingly the supramolecular effect on a redox transition. At cathodic potentials the zinc(II) phenanthroline terpyridine complexes were decomposed due to a reduction of the ligands, as could be detected from an evaluation of the ferrocene redox potential.
我们制备了具有氧化还原活性的纳米级支架和纳米架,作为内部功能化聚合体定向异构方法的原理证明。利用 HE
TTAP 概念,制备了具有内部
二茂铁单元的
锌(II)
菲罗啉萜
吡啶纳米梯架和纳米支架结构。通过比较
二茂铁单元与纳米包 R1 和母体
配体的氧化还原电位,可以读出纳米胶囊中
二茂铁单元产生的近端效应。从较大的纳米载体 L1 到较小的聚合体
L2,
二茂铁单元的压缩程度不断增加,表现为阳极位移的扩大。因此,氧化还原电位系列(对
DMFc:R1 的 E1/2 = 0.462 V,L1 的 E1/2 = 0.480 V,
L2 的 E1/2 = 0.491 V)令人信服地揭示了超分子对氧化还原转变的影响。在阴极电位下,由于
配体的还原,
二茂铁氧化还原电位的评估可以检测到
锌(II)
菲罗啉三
吡啶配合物被分解。