Layered Thiadiazoloquinoxaline-Containing Long Pyrene-Fused N-Heteroacenes
摘要:
AbstractThree thiadiazoloquinoxaline‐containing long pyrene‐fused N‐heteroacenes with 8, 13, and 18 rings were designed and synthesized. They show high electron affinities (EAs) of approximately 4.1 eV, which were derived from the onset of the reduction peaks in cyclic voltammetry. Crystal structure analysis revealed in‐plane extension through close contacts between thiadiazole units as well as layered packing, enabling in‐plane and interlayer electron transport. Organic field‐effect transistor devices provided electron mobilities, which suggest a potential way to enhance the charge transport in long N‐heteroacenes.
Here, we present our recent progress on the synthesis, crystal structure, physical properties and DFT calculations of a novel large pyrene-fused N-heteroacene (15RINGS) with 15 aromatic six-membered rings linearly fused in one row. The long conjugated backbone (more than 35 Å) of 15RINGS possesses a dual-bending feature (the bending angle is about 13.2°).
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
Synthesis, Full Characterization, and Field Effect Transistor Behavior of a Stable Pyrene-Fused <i>N</i>-Heteroacene with Twelve Linearly Annulated Six-Membered Rings
AbstractA series of pyrene‐fused azaacenes with four and six linearly fused rings that possess LUMO levels between −3.7 and −4.3 eV is reported. These LUMO values are remarkably lower than those typically observed for pyrene‐fused azaacenes, even for systems with sixteen linearly fused rings, and are comparable to those observed for state‐of‐the‐art n‐azaacenes.