A new series of linearly extended tetrathiafulvalene analogues with thienothiophene and dithienothiophene Ï-conjugating spacers has been synthesized. Electronic absorption spectra present a vibronic fine structure typical for rigid conjugated systems. Investigation of the electrochemical behaviour of the new donors by cyclic voltammetry reveals the successive generation of stable radical cation and dication species. The crystallographic structure of a single crystal of a dication salt of TT-TTF(ClO4)2 has been analysed by X-ray diffraction. The dication presents a syn conformation stabilised by Sâ¯S intramolecular interactions. The quinoid structure expected for the spacer for the +2 oxidation state is clearly revealed by the bond lengths.
合成了一系列具有
噻吩并
噻吩和二
噻吩并
噻吩π-共轭间隔基的线性扩展
四硫富瓦烯类似物。电子吸收光谱呈现出典型的刚性共轭体系的振动精细结构。通过循环伏安法对新供体的电
化学行为进行研究,揭示了稳定自由基阳离子和二阳离子物种的连续生成。通过对
TT-
TTF(
ClO4)2的二阳离子盐单晶进行X射线衍射分析,分析了其晶体结构。二阳离子呈现出通过S⋯S分子内相互作用稳定的顺式构象。在+2氧化态下,间隔基预期的醌型结构通过键长清晰地展现出来。