hybrid polyphenylenes featuring controlled orientations and dosages of the doping B3N3 rings have been prepared. Detailed photophysical investigations showed that as the doping dosage is increased, the strong luminescent signal is progressively reduced. This suggests that the presence of the B3N3 rings engages additional deactivation pathways, possibly involving excited states with an increasing charge-separated
首次报道了利用乙炔基和乙炔基之间的脱羰[4 + 2] Diels-Alder环加成反应合成两个系列的硼氮杂掺杂聚苯,其中一个或多个芳基单元被硼嗪环取代。四苯基环戊二烯酮衍生物。由于硼嗪核的 N 和 B 原子上的芳基取代基上的不同基团可以对硼嗪核进行功能化,因此我们制备了具有不同掺杂剂量和取向的硼嗪掺杂聚亚苯基。为此,制备了两个分子模块:核心和支化单元。根据中心芳族模块和反应基团的化学性质,模块的每个共价组合产生一种独特的掺杂模式。通过这种方法,已经制备了具有可控取向和剂量的掺杂 B3N3 环的三和六支化杂化聚苯。详细的光物理研究表明,随着掺杂剂量的增加,强发光信号逐渐减弱。这表明 B3N3 环的存在参与了额外的失活途径,可能涉及具有增加的电荷分离特性的激发态,这在全碳类似物中受到限制。值得注意的是,对于那些具有低掺杂剂量的杂化聚苯结构,观察到取向掺杂对荧光量子产率的强烈影响。最后,我们表明
A simple and versatile acetylene equivalent in Diels–Alder reactions
作者:Perumal Raja Kumar
DOI:10.1039/c39890000509
日期:——
Allyl phenyl sulphone and cinnamyl p-tolylsulphone underwent cycloaddition with tetraphenylcyclopentadienone, indanocyclone, 1,3-diphenylisobenzofuran, and tetraphenylcyclopentadiene to give the adducts with elimination of methyl phenyl sulphone and methyl p-tolylsulphone respectively.
Studies on organogermanium heterocycles and related compounds
作者:N.K. Hota、C.J. Willis
DOI:10.1016/s0022-328x(00)86327-5
日期:1968.11
Attempts to synthesize fluorinated heterocycles containing germanium are described. 1,1-Dimethyl-2,3,4,5-tetraphenyl-1-germacyclopentadiene has been prepared, but did not undergo simple Diels-Alder addition to various acetylenes to give isolable germanorbornadienes. The analogous silicon heterocycle underwent ready addition to hexafluoro-2-butyne to give the trifluoromethyl-substituted silanorbornadiene
the synthesis and optical behavior of tetraphenyl benzene and its two derivatives. All the three compounds exhibited aggregation-enhanced emission (AEE) properties at a low concentration. The AEE mechanism was investigated and is due to restricted intramolecular rotation and unique packing structure. Furthermore, this kind of dendritic benzenederivatives exhibited interesting optical properties with
Buchwald ligand-assisted Suzuki cross-coupling of polychlorobenzenes
作者:Andrei A. Vasil’ev、Alexander S. Burukin、Galina M. Zhdankina、Sergei G. Zlotin
DOI:10.1016/j.mencom.2021.04.039
日期:2021.5
Screening of four Buchwald ligands for the cross-coupling of isomeric di-, tri- and tetrachlorobenzenes with arylboronic acids revealed that good yields of exhaustive substitution can be best provided by 2-dicyclohexylphosphino-2′-(dimethylamino) biphenyl (DavePHOS).