Photoswitchable Norbornadiene–Quadricyclane Interconversion Mediated by Covalently Linked C
<sub>60</sub>
作者:Patrick Lorenz、Andreas Hirsch
DOI:10.1002/chem.201904679
日期:2020.4.21
and properties of various norbornadiene/quadricyclane (NBD/QC) fullerene hybrids are reported. By cyclopropanation of C60 with malonates carrying the NBD scaffold a small library of NBD-fullerene monoadducts and NBD-fullerene hexakisadducts was established. The substitution pattern of the NBD scaffold, as well as the electron affinity of the fullerene core within these hybrid systems, has a pronounced
报道了各种降冰片二烯/四环烷(NBD / QC)富勒烯杂化物的合成和性质。通过用携带NBD支架的丙二酸酯对C60进行环丙烷化,建立了NBD-富勒烯单加合物和NBD-富勒烯六加合物的小文库。在这些杂化系统中,NBD支架的取代方式以及富勒烯核心的电子亲和力,对相应的富能QC衍生物的性能产生了显着影响。基于此,实现了NBD-富勒烯杂化物向其QC衍生物的首次直接光异构化。此外,可以使用QC-富勒烯单加合物的氧化还原活性富勒烯核,以使逆反应形成相应的NBD-富勒烯单加合物。结合这两个过程,只需在310至400 nm之间更改照射波长,即可在NBD和QC之间切换。因此,将此通常的光/热开关变成纯光开关。这不仅简化了对系统内NBD-QC互转换的基础过程的研究,而且使这种混合体对于分子开关等应用很有趣。