An approach for introducing twists in pyrene-fusedazaacenes is reported. Depending on the volume and the rigidity of the silyl groups, different-sized twist angles, which oscillate between 4 degrees and 24 degrees , are induced along the longitudinal conjugated backbone.
Dimeric Cycloparaphenylenes with a Rigid Aromatic Linker
作者:Ke Li、Zhanqiang Xu、Han Deng、Zhennan Zhou、Yanfeng Dang、Zhe Sun
DOI:10.1002/anie.202016995
日期:2021.3.29
Dimericcycloparaphenylene (CPP) architectures with well‐defined flipping motion are constructed taking advantage of an efficient cyclocondensation reaction. Variable‐temperature nuclear magnetic resonance (VT‐NMR) analyses and theoretical calculations indicate rapid interconversion of cis and trans conformers at room temperature, while energetically favorable trans conformer exists at low temperature