Stabilization of the radical cationic state of a donor molecule by 3-D homoconjugation was probed using a substituted carbon-bridged oligophenylenevinylene backbone (COPV, or 5,5-diarylindeno[2,1-a]indenes). For molecules bearing electron-donating groups as the 5,5-aryl moieties, a one-electron oxidation of the COPV backbone results in delocalization of the cationic charge over the whole molecule with
groups that facilitate optical resolution and also serve as a platform for the synthesis of a variety of opticallyactive derivatives, which exhibit circularly polarized photoluminescence with high fluorescence quantum yields, large dissymmetry factors, and high photostability. For example, a bis(phenylethynyl) derivative exhibited a fluorescence quantum yield of 0.99, and a dissymmetry factor in luminescence
A variety of 1H-indenes, dihydro-s-indacenes, and diindenoindacenes, carbon-bridged phenylenevinylene derivatives, can be synthesized,in good to high yields using as a synthetic module a 3-lithioindene compound made available by reductive cyclization of an alkynylbenzene derivative. The planar analogues of oligophenylenevinylene compounds thus synthesized show physical properties beneficial for use as ambipolar organic semiconductor materials.
Air- and Heat-Stable Planar Tri-<i>p</i>-quinodimethane with Distinct Biradical Characteristics
A heptacyclic carbocycle possessing three p-quinodimethane units conjugated in one plane has been synthesized and shown to exhibit distinct biradical characteristics. The molecule has a HOMO/LUMO band gap of ca. 1 eV and a S(0)-T(1) energy gap of 2.12 kcal/mol, and it absorbs and emits near-IR light at room temperature. It is air-stable under ambient light for several months and thermally stable up to 160 degrees C under nitrogen, and it undergoes reversible two-electron oxidation and reduction. The synthetic approach is such that a smaller and larger oligo-p-quinodimethane can be synthesized.
Blue fluorescent dihydro-indenoindene derivatives with unusual low oxidation potentials as multifunctional OLED materials
作者:Yi Wei、Wei-Jyun Wang、Yu-Ting Huang、Bo-Cheng Wang、Wen-Hao Chen、Sang-Hsiu Wu、Chiu-Hui He
DOI:10.1039/c3tc32245a
日期:——
Blue fluorescent bis(diarylamino)dihydro-indenoindene derivatives were synthesised as candidate materials for multifunctional OLEDs.