Oligo(furan-2,5-diylvinylene)s as π-conjugating spacers in linearly extended hybrid tetrathiafulvalene analogues
作者:El Hadj Elandaloussi、Pierre Frère、Amina Benahmed-Gasmi、Amédée Riou、Alain Gorgues、Jean Roncali
DOI:10.1039/jm9960601859
日期:——
The synthesis of a new series of pushâpush systems based on furan-2,5-diylvinylene oligomers end-capped with l,3-dithiol-2-ylidene electron-releasing groups is described. 1H NMR spectroscopy and X-ray diffraction reveal that the molecules adopt a planar conformation stabilized by strong intramolecular interactions. Electronic absorption spectroscopy indicates that the effective conjugation length increases steadily with the length of the Ï-conjugated system without any evidence of saturation. Analysis of electrochemical behaviour by cyclic voltammetry shows that, whereas all compounds are easily oxidized into stable dications, with extension of the conjugation length the oxidation process progressively evolves from two successive one-electron steps to a single step two-electron transfer.
描述了基于以 1,3-二硫醇-2-亚基电子释放基团封端的呋喃-2,5-二基亚乙烯基低聚物为基础的一系列新的推-推体系的合成。 1H NMR 光谱和 X 射线衍射表明,分子采用强分子内相互作用稳定的平面构象。电子吸收光谱表明,有效共轭长度随着α-共轭体系的长度稳定增加,没有任何饱和的迹象。通过循环伏安法对电化学行为的分析表明,虽然所有化合物都很容易被氧化成稳定的双阳离子,但随着共轭长度的延长,氧化过程逐渐从两个连续的单电子步骤演变为一步的双电子转移。