Oligoaryl Cruciform Structures as Model Compounds for Coordination-Induced Single-Molecule Switches
作者:Sergio Grunder、Roman Huber、Songmei Wu、Christian Schönenberger、Michel Calame、Marcel Mayor
DOI:10.1002/ejoc.200901150
日期:2010.2
perpendicular oligoaryl bars were assembled with a Suzuki reaction using the corresponding boronic acids, which were already fitted with an ethyl-trimethylsilane (ethyl-TMS) sulfanyl group. In a last step, the ethyl-TMS-protected sulfur atoms were transprotected to the thioacetyl units. The cruciform structures 3 and 4 are model compounds to investigate a coordination-induced single-molecule switch exploiting
合成了两个新的十字形结构 3 和 4,包括低聚(亚苯基-亚乙烯基)(OPV)和垂直的低聚芳基棒 - 即低聚亚苯基(OP)(3)和萘基-苯基-萘基系统(4) - 报道. OPV 棒由两个末端吡啶单元组成,而低聚芳基棒带有两个末端乙酰硫基作为受保护的锚定基团。OPV 棒是通过 Horner-Wadsworth-Emmons 反应组装的,这直接导致了所需的 E,E 异构体。使用相应的硼酸通过 Suzuki 反应组装垂直的低聚芳基棒,该硼酸已经配备了乙基-三甲基硅烷 (乙基-TMS) 硫烷基。在最后一步中,乙基-TMS 保护的硫原子被转保护为硫代乙酰基单元。十字形结构 3 和 4 是模型化合物,用于研究配位诱导的单分子开关,利用锚定基团与金的潜在依赖性不同键合强度。金属-分子-金属结是使用机械可控断裂结 (MCBJ) 设置形成的。对分子连接的电流痕迹进行统计分析。对仅由单条组成的模型化合物的进一步