Scholl氧化已成为自下而上合成分子纳米石墨烯的一个重要反应。在此,作者描述了由起始衬底(1?a,?b)上的电子效应控制的Scholl反应?。在Scholl条件下,蒽基聚苯导致螺纳米石墨烯。相反,缺电子的anthracene衬底提供了由两个正交dibenzo[fg,ij]phenanthro-[9,10,1,2,3-pqrst]pentaphene (DBPP)和octafluoroanthracene核连接而形成的螺旋排列的分子纳米石墨烯。密度泛函理论(DFT)计算预测,电子效应要么控制螺环的第一次形成和随后的Scholl反应以形成螺环纳米石墨烯2,要么通过预期的脱氢反应仅形成螺旋纳米石墨烯3。用单晶X射线衍射分析了四种新螺环化合物(syn 2, syn 9, anti 9 and syn 10)的晶体结构。新分子纳米石墨烯3的光物理特性显示出显著的双荧光发射。
示意图1 Scholl oxidation of 1 leads to the formation of spironanographene syn 2 or helical nanographene 3 depending on the electronic features of the starting polyphenylene (1?a or 1?b).
示意图2 Synthetic scheme for the synthesis of 1?a and further Scholl reaction.
示意图3 Synthetic scheme for the preparation of nanographene 3
图1 Molecular structure of the compounds solved by single crystal X-ray diffraction, where hydrogen atoms have been omitted for clarity; a)?syn 9, b)?anti 9, c)?syn 10, d)?syn 2.
图2 Intramolecular π-π interactions in syn 2.
图3 Computed reaction profiles for the Scholl and spiro-cyclization reactions involving anthracene derivative 1?a-M.
图4 Normalized absorption (dark green) and emission (clear green) spectra of syn 2 recorded in hexane at room temperature
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来源:Patricia Izquierdo-García, Dr. Jesús M. Fernández-García, Dr. Josefina Perles, Dr. Israel Fernández, Prof.?Dr. Nazario Martín,Electronic Control of the Scholl Reaction: Selective Synthesis of Spiro vs Helical Nanographenes,Angew. Chem. Int. Ed. 2023, 62, e202215655,https://doi.org/10.1002/anie.202215655
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