Redox Switching of Conjugation Length Using 9,9,10,10-Tetraaryl-9,10-dihydrophenanthrene as an ON/OFF Unit: Preparation, X-ray Structure, and Redox Properties of Perfluorobiphenyl Derivative and Its S<sub>N</sub>Ar Reactions to π-Extended Analogues
作者:Takanori Suzuki、Hitomi Tamaoki、Ryo Katoono、Kenshu Fujiwara、Junji Ichikawa、Takanori Fukushima
DOI:10.1246/cl.130190
日期:2013.7.5
Octafluorobiphenyl-2,2′-diylbis(diarylmethylium) dye 2a2+ prepared from 1,2-dibromotetrafluorobenzene is interconvertible with colorless dihydrophenanthrene donor 1a. By the SNAr reactions of 1a with acetylides, π-extended analogues 1b and 1c were obtained. Their electrochromic behavior is accompanied by a drastic absorption change not only in the visible but also UV region, because the torsion angle of the biaryl unit is modified upon redox reactions.
由1,2-二溴四氟苯制备的八氟联苯-2,2′-二基双(二芳基甲基)染料2a2+可以与无色的二氢菲供体1a相互转化。通过1a与乙炔的SNAr反应,获得了π扩展的类似物1b和1c。它们的电致变色行为伴随着显著的吸收变化,不仅在可见光区域,还在紫外区域,因为在氧化还原反应中,双芳基单元的扭转角发生了改变。