1372804-17-5Relevant articles and documents
Synthesis, Characterization, and Properties of Bis-BN Ullazines
Li, Chenglong,Liu, Yuming,Sun, Zhe,Zhang, Jinyun,Liu, Meiyan,Zhang, Chen,Zhang, Qian,Wang, Hongjuan,Liu, Xuguang
, p. 2806 - 2810 (2018)
A series of bis-BN ullazine derivatives, including the parent species, were synthesized in a small number of steps from commercially available materials. X-ray crystallographic analysis revealed that bis-BN ullazines have rigid and planar frameworks. Most of the bis-BN ullazines are stable toward air and moisture. In addition, the absorption and emission bands of these ullazines are blue-shifted, compared to those of their carbonaceous ullazine analogs.
Approaches for Selective Synthesis of Ullazine Donor–Acceptor Systems
Drigo, Nikita A.,Paek, Sanghyun,Huckaba, Aron J.,Schouwink, Pascal A.,Tabet, Nouar,Nazeeruddin, Mohammad K.
, p. 17209 - 17212 (2017)
Methods for effective synthesis for the four possible isomeric 3,9-diphenylullazine carboxaldehydes and reactive halogen intermediates are described. Ullazine donor–acceptor (D–A) dyes were studied using UV/Vis, photoluminescence (PL) spectroscopy and cyclic voltammetry. X-ray single crystal diffraction analysis independently confirmed the structures of two key intermediates. A D–A dye based on ullazine with dihexylmalonate acceptor was tested as a dopant-free hole-transporting material (HTM) in a perovskite solar cell, exhibiting promising power conversion efficiency (PCE) reaching 13.07 %.
Controlling charge-transfer properties through a microwave-assisted mono- or bis-annulation of dialkynyl-: N -(het)arylpyrroles
Pierrat, Philippe,Hesse, Stéphanie,Cebrián, Cristina,Gros, Philippe C.
, p. 8568 - 8575 (2017/10/27)
A selective microwave-assisted mono- and bis-annulation of dialkynyl-N-(het)arylpyrrole derivatives is described. These polycyclic aromatic hydrocarbons (PAHs) have been photophysically and computationally characterized. The mono-annulated systems display interesting charge-transfer properties. By contrast, these properties vanish within the more conjugated bis-annulated compounds.
Effect of π-spacers and anchoring groups on the photovoltaic performances of ullazine-based dyes
Qiao, He,Deng, Yanghua,Peng, Ruipeng,Wang, Guo,Yuan, Jing,Tan, Songting
, p. 70046 - 70055 (2016/08/06)
Three ullazine-based organic sensitizers (QD1, QD2 and QD3) have been designed, synthesized, and characterized for dye-sensitized solar cells (DSSCs). Ullazine possesses some attractive properties, such as a planar π-system to promote intensely the intram
Synthesis of pyrrolo[1,2-a] quinolines and ullazines by visible light mediated one- and twofold annulation of N-arylpyrroles with arylalkynes
Das, Amrita,Ghosh, Indrajit,K?nig, Burkhard
supporting information, p. 8695 - 8698 (2016/07/15)
1-(2-Bromophenyl)-1H-pyrrole and 1-(2,6-dibromophenyl)-1H-pyrrole react in the presence of catalytic amounts of rhodamine 6G (Rh-6G) and N,N-diisopropylethylamine (DIPEA) under blue light irradiation with aromatic alkynes and subsequently cyclize intramol
Palladium-Catalyzed Annulation of Internal Alkynes: Direct Access to π-Conjugated Ullazines
Wan, Danyang,Li, Xiaoyu,Jiang, Ruyong,Feng, Boya,Lan, Jingbo,Wang, Ruilin,You, Jingsong
supporting information, p. 2876 - 2879 (2016/07/06)
A palladium-catalyzed cyclization reaction of 1-(2,6-dibromophenyl)-1H-pyrroles with alkynes has been developed to construct various π-conjugated indolizino[6,5,4,3-ija]quinolones (ullazines) with a reactive functional group tolerance. As illustrative examples, three new ullazine-based sensitizers are synthesized, and the performance of these dyes is examined in DSSC devices, which demonstrates the potential of direct C-H functionalization in the construction of organic optoelectronic materials.
The molecular engineering of organic sensitizers for solar-cell applications
Delcamp, Jared H.,Yella, Aswani,Holcombe, Thomas W.,Nazeeruddin, Mohammad K.,Graetzel, Michael
supporting information, p. 376 - 380 (2013/02/23)
Positive to the core: Ullazine has both strong electron-donating and weak accepting properties. This heterocycle was incorporated into sensitizers for dye-sensitized solar cells (DSCs). One of these sensitizers demonstrated strong light absorption across the UV/Vis region. The corresponding DSC device has a maximum IPCE of 95% at 520 nm, with a power conversion efficiency of 8.4%.
