55119-09-0Relevant articles and documents
Fixing flexible arms of core-shared ligands to enhance the stability of metal-organic frameworks
Dong, Chen,Bai, Jinquan,Lv, Xiu-Liang,Wu, Wei,Lv, Jie,Li, Jian-Rong
, p. 15909 - 15916 (2019)
In recent years, more and more research on metal-organic frameworks (MOFs) has focused on exploring their practical applications, where the stability is crucial. Besides the metal-ligand coordination bond, the configuration of the ligand also plays an imp
Solid-State Bromination of Poly(1,6-di-N-carbazolyl-2,4-hexadiyne): A 13C CP-MAS NMR Study
Eckert, Hellmut,Yesinowski, James P.,Sandman, Daniel J.,Velazquez, Christopher S.
, p. 761 - 768 (1987)
13C cross-polarization/magic-angle spinning (CP-MAS) NMR experiments at 50.36 MHz reveal that the solid-state reaction of the crystalline polymer poly(N-dicarbazolyl-2,4-hexadiyne) (poly-DCH) with liquid bromine results in the formation of covalent C-Br bonds in the polymer.The presence of bromine in these compounds results in loss of the signals arising from those carbon atoms directly bonded to or adjacent to bromine due broadening effects arising from dipolar coupling to the quadrupolar 79,81Br isotopes.Nevertheless, 13C CP-MAS NMR can identify carbon atoms more than two bonds removed from bromine and allows one to monitor semiquantitatively the course of the bromination.By comparison with model compounds it is shown that bromine effects selective electrophilic aromatic substitution at the 3,6 positions on the aromatic rings of the carbazole moiety, forming a polymer with four Br per repeat unit.At higher bromination levels addition to the multiple bonds in the backbone occurs.For the material of composition poly-DCH(Br6.0), the results indicate extensive conversion of the polydiacetylene structure to a mixed polyacetylene structure.The observation of additional weak absorptions corresponding to butatrienic units suggests that the bromine-backbone interaction leads to localization of conjugation defects.
Low-Cost Carbazole-Based Hole-Transport Material for Highly Efficient Perovskite Solar Cells
Chen, Zhiliang,Li, Hui,Zheng, Xiaolu,Zhang, Qi,Li, Zhanfeng,Hao, Yuying,Fang, Guojia
, p. 3111 - 3117 (2017)
A low-cost carbazole-based small-molecule material, 1,3,6,8-tetra(N,N-p-dimethoxyphenylamino)-9-ethylcarbazole, was designed and synthesized through a facile three-step synthetic route. The material was characterized and applied as a hole-transport materi
Flexible metal-organic frameworks for the wavelength-based luminescence sensing of aqueous pH
Lv, Xiu-Liang,Xie, Lin-Hua,Wang, Bin,Zhao, Minjian,Cui, Yuanjing,Li, Jian-Rong
supporting information, p. 10628 - 10639 (2018/10/24)
Luminescence sensing is commonly based on the change of emission intensity, lifetime, and/or quantum yield of luminescent materials. Wavelength-based luminescence sensing has been comparatively rarely documented. Flexible metal-organic frameworks (MOFs) with rich fluorophores are promising sensory materials due to their unique stimuli-responsive luminescence. However, it is still challenging to construct such materials with high hydrolytic stability, which would allow them to be utilized in water systems. Here, we present two isoreticular flexible MOFs synthesized by carbazole-derived ligands, which show high porosity and excellent stability in aqueous solutions with a wide range of pH values. Interestingly, both MOFs show a structural breathing behavior with variation of the guest molecules inside their pores due to the topologically allowed flexibility. With their frameworks breathing, sensitive fluorescence changes in the wavelength of the maximum emission have been observed. Remarkably, the wavelengths of the maximum emission are well dependent on the pH values (1 to 8) of the aqueous solution in a linear relationship, suggesting a new means of accomplishing pH sensing based on emission wavelength instead of intensity. Wavelength-based fluorescence sensing thus offers an alternative way of achieving pH indication, free from some of the drawbacks associated with intensity-based fluorescence sensing, which should be fundamentally important for the development of new pH sensors in environmental and life sciences.
Butterfly-shaped tetrasubstituted carbazole derivatives as a new class of hosts for highly efficient solution-processable green phosphorescent organic light-emitting diodes
Huang, Hong,Fu, Qiang,Pan, Biao,Zhuang, Shaoqing,Wang, Lei,Chen, Jiangshan,Ma, Dongge,Yang, Chuluo
supporting information, p. 4786 - 4789 (2013/01/15)
A new bromination method, where butterfly-shaped tetrasubstituted carbazole derivatives TSPFCz and TTPhCz have been designed and synthesized, which possess the twist butterfly skeletons and exhibit excellent thermal and morphological stabilities, has been
A new method for bromination of carbazoles, β-carbolines and iminodibenzyls by use of N-bromosuccinimide and silica gel
Smith, Keith,Martin James,Mistry, Anil G.,Bye, Martin R.,John Faulkner
, p. 7479 - 7488 (2007/10/02)
Carbazole, N-ethylcarbazole, iminodibenzyl (10,11-dihydro-5H-dibenz[b,f]azepine), N-ethyliminodibenzyl and imipramine are readily mono-, di- or polybrominated in high yields at ambient temperature in dichloromethane by use of the appropriate quantity of N-bromosuccinimide in the presence of silica gel. By contrast, the brominations of the β-carbolines, harmane and norharman, are less selective and give mixtures of products, some of which have unusual substitution patterns.