Peripheral aryl-substituted pyrrole fluorophores for glassy blue-light-emitting diodes
摘要:
In this work, a series of aryl-substituted pyrrole analogues were synthesized. These pyrrole analogues emit violet to blue light. Fluorescence and amorphous glassy properties of these pyrrole analogues were induced by manipulating the peripheral aryl groups. These crowded peripheral aryl groups would effectively prevent the fluorophores from aggregation, resulting in higher quantum efficiency and a stable emission spectrum in the solid state. One of the aryl-substituted pyrrole analogues, namely NPANPy can be used as hole-transporting material or hole-transporting/emitting material. The devices would emit blue light when the fluorophore NPANPy acts as the hole-transporting/ emitting material. Their CIE coordinate is around (0.16, 0.14), whereas the maximum brightness can reach 4300-5000 cd m(-2). Apart from that, when the fluorophore was used only as the hole-transporting material, better device performances, especially in low current density, were found, as compared with the standard device. (C) 2007 Elsevier Ltd. All rights reserved.
Palladium(II)-Catalyzed [2+2+1] Annulation of Alkynes and Hydroxylamines: A Rodox-Neutral Approach to Fully Substituted Pyrroles
作者:Jiaxing Bai、Nengni Xu、Hui Wang、Xinjun Luan
DOI:10.1021/acs.orglett.2c01925
日期:2022.7.22
A palladium-catalyzed [2+2+1] annulation of alkynes and hydroxylamines has been developed for the rapid construction of fully substituted pyrroles. This transformation involves sequential nucleophilic-addition of hydroxylamine to alkyne, alkyne migratory insertion, and synergistic demetallization cyclization, which provides a redox-neutral annulationapproach to pyrrole derivatives. Moreover, the strategy
Acid-Promoted Cross-Dehydrative Aromatization for the Synthesis of Tetraaryl-Substituted Pyrroles
作者:Xudong Wu、Ke Li、Siyuan Wang、Chao Liu、Aiwen Lei
DOI:10.1021/acs.orglett.5b03240
日期:2016.1.4
Tetraaryl-substituted pyrroles are one important class of luminophores. In this work, an acid-promoted cross-dehydrative aromatization between benzoin and deoxybenzion was developed. This transformation provides an efficient and straightforward path for the synthesis of various aryl group substituted tetraarylpyrroles. Good to excellent yields were obtained through the easy operation with acetic acid and ammonium acetate.
Fehrlin, Chemische Berichte, 1889, vol. 22, p. 555
作者:Fehrlin
DOI:——
日期:——
Boehm, Stanislav; Slavik, Hanus; Kuthan, Josef, Collection of Czechoslovak Chemical Communications, 1989, vol. 54, # 1, p. 200 - 205