A series of pyrroles functionalized in the 3-position with p-dimethoxybenzene via various linkers (CH2, CH2CH2, CH=CH, C≡C) has been synthesized. Their electronic properties have been deduced from 1H NMR, 13C NMR, and UV–vis spectra to detect possible interactions between the two aromatic subunits. The extent of conjugation between the subunits is largely controlled by the nature of the linker, with the largest conjugation found with the trans-ethene linker and the weakest with the aliphatic linkers. DFT calculations revealed substantial changes in the HOMO–LUMO gap that correlated with the extent of conjugation found experimentally. The results of this work are expected to open up for use of the investigated compounds as components of redox-active materials in sustainable, organic electrical energy storage devices.
一系列在3位被p-二甲氧基苯基通过不同的连接基(CH2,CH2CH2,CH=CH,C≡C)官能化的吡咯已被合成。通过1H NMR,13C NMR和UV-vis光谱推断它们的电子性质,以检测两个芳香基团之间可能的相互作用。基团之间的共轭程度在很大程度上由连接基的性质控制,其中使用trans-乙烯基连接基具有最大的共轭,而脂肪族连接基则最弱。DFT计算揭示了与实验发现的共轭程度相关的HOMO-LUMO间隙的显着变化。这项工作的结果预计将为可持续的有机电能存储器材料的组分使用这些研究化合物开辟道路。