5,10-Dihydrobenzo[a]indolo[2,3-c]carbazole: A Highly Fluorescent Disk-shaped Electron Donor Exhibiting Dual UV–vis–NIR and Fluorescence Spectral Changes upon Electrolysis
摘要:
通过金(I)催化的级联环化这一关键步骤,制备出了标题电子供体,并通过 X 射线分析证实了其平面几何形状。由于框架中含有 1,4-苯二胺分子,它可以进行可逆的单电子氧化。电解时,它在紫外-可见-近红外区域表现出电致变色反应,同时由于只有中性供体具有高荧光,荧光光谱也发生了急剧变化。
Selective Formation of a Mixed‐Valence State from Linearly Bridged Oligo(aromatic diamines): Drastic Structural Change into a Folded Columnar Stack for Half‐filled Polycations
which enables the selective generation of half‐filled (n/2‐charged) polycations from linearly bridged oligomers with n electron‐donating units. When π‐extended phenylenediamine units are connected by meta‐xylylene‐type spacers, the resulting oligomers adopt non‐folded structures in the neutral state owing to the non‐conjugating and flexible nature of the spacer, whereas the structure shows a drastic change
5,10-Dihydrobenzo[<i>a</i>]indolo[2,3-<i>c</i>]carbazole: A Highly Fluorescent Disk-shaped Electron Donor Exhibiting Dual UV–vis–NIR and Fluorescence Spectral Changes upon Electrolysis
Through gold(I)-catalyzed cascade cyclization as a key step, the title electron donor was prepared, which adopts a planar geometry, as confirmed by an X-ray analysis. Due to 1,4-phenylenediamine moiety incorporated in the framework, it undergoes reversible one-electron oxidation. Upon electrolysis, it exhibited an electrochromic response in the UV–vis–NIR region, which was accompanied by a drastic change in the fluorescence spectrum since only the neutral donor is highly fluorescent.
通过金(I)催化的级联环化这一关键步骤,制备出了标题电子供体,并通过 X 射线分析证实了其平面几何形状。由于框架中含有 1,4-苯二胺分子,它可以进行可逆的单电子氧化。电解时,它在紫外-可见-近红外区域表现出电致变色反应,同时由于只有中性供体具有高荧光,荧光光谱也发生了急剧变化。
Redox-induced Conformational Changes in 1,3-Propylene- and<i>m</i>-Xylylenebis[5-(10-butyl-5,10-dihydrobenzo[<i>a</i>]indolo[2,3-<i>c</i>]carbazole)]: Twin-BIC Donors that Form Sandwich-like Dimeric Cations Exhibiting NIR Absorption
disk-shaped heterocyclic diamine undergo two-stage stepwise one-electron oxidation to the corresponding cationradicals and dication diradicals. They adopt a stacked geometry as in pimers and π-dimers, respectively. In contrast, the third and fourth oxidation processes occur nearly at the same potential, indicating that tricationic/tetracationic species prefer the extended geometry. The similar redox-induced
Wurster’s Blue-type Cation Radicals Framed in a 5,10-Dihydrobenzo[<i>a</i>]indolo[2,3-<i>c</i>]carbazole (BIC) Skeleton: Dual Electrochromism with Drastic Changes in UV/Vis/NIR and Fluorescence
one‐electron oxidation to the corresponding Wurster’s Blue (WB)‐type species that exhibits NIR absorptions up to λ=1200 nm. In the case of the N,N′‐dimethyl derivative, cation radical 1 c+. is stable enough to be isolated as a salt and X‐ray analysis indicated paraquinoid‐type bond alternation in the WB core unit, whereas the bond lengths in the peripheral benzene rings are identical to those in the neutral
通过金(I)催化环化制备了采用平面圆盘形几何形状的供电子二氢苯并吲哚并咔唑(BIC)1 a – c作为关键步骤。由于框架中存在1,4-苯二胺(PD)部分,它们经历了可逆的单电子氧化,变成了相应的Wurster's Blue(WB)型物质,在λ = 1200 nm处显示出NIR吸收。对于N,N'-二甲基衍生物,阳离子自由基为1 c +。X射线分析表明WB核心单元中的对醌型键交替,因此其稳定性足以分离成盐,而X射线分析表明其外围苯环中的键长与中性供体中的键长相同。在电化学互变中,氧化还原对为1 a – c和1 a – c +。表现出在紫外/可见/近红外区域的电致变色反应,这是伴随着在荧光光谱的急剧变化,因为只有中性供体1 - ç是高发射(Φ ˚F:0.7-0.8)。