AI Article Synopsis
- Two types of porous nanographenes based on fenestrindane were created and analyzed using NMR and mass spectrometry.
- They were synthesized through a series of chemical reactions, including Suzuki-Miyaura cross-couplings and Cyclodehydrogenation, resulting in good yields.
- Their properties were examined with spectroscopy techniques, revealing weak chloride ion binding due to their twisted structure, making them unique in their category.
Article Abstract
Two fenestrindane-based porous nanographenes containing four polyaromatic macrocycles in a highly twisted, basically S-symmetric conformation were synthesized and characterized by NMR spectroscopy and mass spectrometry. Stepwise π-extension at the periphery of the fenestrindane core by a sequence of eightfold Suzuki-Miyaura cross-coupling, fourfold Scholl cyclodehydrogenation and another eightfold Suzuki-Miyaura reaction affords the porous nanographene precursors in good yields. In the last step, fourfold intramolecular Yamamoto coupling generates the porous nanographenes in 17-18 %-yield. Their optical and electronic properties were studied by UV/Vis and fluorescence spectroscopy and cyclic voltammetry. DFT calculations revealed structural details of the macrocycles. The surprisingly weak binding of these porous structures with chloride ions (K≈10 M) is attributed to their highly twisted conformation. The title compounds represent the first porous nanographenes based on the [5.5.5.5]fenestrane motif and, at the same time, they consist of a fenestrane-like polyarylene network.
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