1484-04-4Relevant articles and documents
A short route to heteroarylcarbazoles: Synthesis of new pyrazolylcarbazoles and carbazolylquinolines
Nagarajan, Rajagopal,Perumal, Paramasivan T.
, p. 1269 - 1273 (2004)
A short synthesis of pyrazolylcarbazoles from 9-alkyl-carbazoles in three steps is reported. The acetylcarbazoles prepared by the acetylation of carbazoles with acetic anhydride catalyzed by BiCl3 were converted into chloroaldehydes with Vilsmeier reagent. Condensation of chloroaldehydes with hydrazine followed by cyclization yield the pyrazolylcarbazoles. Carbazolyl chalcones were prepared by the condensation of carbazole-3-aldehyde with o-aminoacetophenone and cyclized to carbazolylquinolone using several catalysts. Cyclization of carbazolyl chalcones with the Vilsmeier reagent yields a mixture of carbazolylquinoline carbaldehydes.
Facile procedure for the synthesis of 3-acetyl-9-ethylcarbazole and corresponding functionalized bis-diketone compounds
Tang, Rui-Ren,Zhang, Wei
, p. 601 - 606 (2010)
Acetylation-substituted N-ethylcarbazole at the 3-position was synthesized in 80% yield using ZnCl2 as catalyst, and its corresponding functionalized bis-diketone compounds 2a and 2b were prepared by Claisen condensation with acceptable yields.
A New and Facile Method for the Synthesis of Nitrocarbazoles by Urea Nitrate
Nagarajan, Rajagopal,Muralidharan,Perumal, Paramasivan T.
, p. 1259 - 1264 (2004)
Urea nitrate in acetic acid is found to be an effective and mild nitrating agent for the preparation of mono nitrocarbazoles.
Pure Organic Room Temperature Phosphorescence from Excited Dimers in Self-Assembled Nanoparticles under Visible and Near-Infrared Irradiation in Water
Wang, Xiao-Fang,Xiao, Hongyan,Chen, Peng-Zhong,Yang, Qing-Zheng,Chen, Bin,Tung, Chen-Ho,Chen, Yu-Zhe,Wu, Li-Zhu
, p. 5045 - 5050 (2019)
Pure organic room temperature phosphorescence (RTP) has unique advantages and various potential applications. However, it is challengeable to achieve organic RTP under visible and near-infrared (NIR)-light excitation, especially in aqueous solution. Herei
A facile method for the synthesis of acetylcarbazoles and carbazole aldehydes
Nagarajan, Rajagopal,Perumal, Paramasivan T.
, p. 2127 - 2133 (2004)
Acetylation of 9-alkylcarbazoles with acetic anhydride catalyzed by PPh3. HClO4 was reported to give acetylcarbazoles. Carbazole aldehydes were easily synthesized by the Vilsmeier reaction of 9-alkylcarbazoles under microwave condition in good yields.
HS? facilitated sulfur pyran realizing hydrogen sulfide detection and imaging in HepG2 cells and chlorella
Chao, Jianbin,Xu, Miao,Zhang, Yongbin,Huo, Fangjun,Liu, Yaoming,Wang, Xiaolu,Yin, Caixia
, p. 227 - 232 (2019)
The new carbazole-based fluorescent probe CA-1 was designed and synthesized for the high selective detection of H2S based on HS? facilitated sulfur pyran resulting in UV–Vis and fluorescent spectra changes. At the same time, the probe showed good sensitivity to the detection of H2S with a low detection limit of 0.16 μM. The detection process can be monitored by naked eye: with the addition of H2S, the probe system changed from yellow to pink. Importantly, the probe could be applied in monitoring H2S in HepG2 cells and Chlorella. These results indicate that CA-1 can be used as a promising fluorescent probe for the detection of H2S in situ.
Influence of thiophene spacer and auxiliary acceptor on the optical properties of 4-(Diethylamino)-2-hydroxybenzaldehyde based D-π-A-π-D Colorants with N-alkyl donors: Experimental, DFT and Z-scan study
Raikwar, Manish M.,Patil, Dinesh S.,Mathew, Elizabeth,Varghese, Manu,Joe, Issac H.,Sekar, Nagaiyan
, p. 45 - 58 (2019)
We report here design and synthesis of four new D-π-A-π-D type dyes (4 and 5) with triphenylamine/N-ethyl carbazole as fixed rotor/donor and N, N-diethyl amine as a secondary donor having dicyanovinylene as a common acceptor. The Influence of π-linker (thiophene) along with an auxillary cyano group on the nonlinear and linear optical properties is investigated. Molecules with thiophene spacer (4b and 5b) exhibit progressive variation in their absorption and emission profiles reflecting the effect of π-linker, compared to those devoid of thiophene spacer (4a and 5a). The dyes display solvent dependent emission [e.g. 4b (toluene = 689 nm) and 5b (DMSO = 795 nm)] suggesting a more polarized photo-excited state arising as a result of enhanced intramolecular charge transfer in the excited state. The solvatochromic nature is supportive of a general solvent effect, which is confirmed by solvent polarity plots (Weller's and Rettig's plot). The trends in the optical properties were also validated by time dependent density functional theory computations which further reveals charge transfer (from secondary donor to acceptor) for the long wavelength absorption. Dye with the highest charge transfer dipole moment relatively has the maximum two-photon absorption cross-section area (4b = 246–399 GM) which was established using theoretical two-level model. Non-linear optical properties were investigated using solvatochromic two-level model and computationally using global and range separated hybrid functionals. The dyes show high first-order hyperpolarizability (β0) in the range of 191–1162 × 10?30 e.s.u. and second-order hyperpolarizability (γ0) in the range of 491–6,704 × 10?36 e.s.u. Z-scan results show 4a (3.79 × 10?13 e.s.u.) possesses a higher value of third order nonlinear susceptibility in DMSO. Thus, the dyes can be considered as promising candidates for NLO application in material science.
A Solid-State Fluorescent Material Based on Carbazole-Containing Difluoroboron β-Diketonate: Multiple Chromisms, the Self-Assembly Behavior, and Optical Waveguides
Chen, Peng-Zhong,Zhang, Han,Niu, Li-Ya,Zhang, Yi,Chen, Yu-Zhe,Fu, Hong-Bing,Yang, Qing-Zheng
, (2017)
A carbazole-containing difluoroboron β-diketonate complex (BCZ), which shows strong fluorescence in both the solid state and in organic solutions, is reported. The crystalline materials of BCZ obtained from different solvents display different emission colors. Single-crystal analysis reveals that the enhanced overlap between adjacent molecules induces increased excited-state delocalization and is responsible for the variation of the emission colors from yellow to red. The emission colors of the materials are effectively tuned by external stimuli such as grinding, heating, and solvent vapor. The powder X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis, and 1H NMR studies on materials of BCZ reveal that the thermochromic properties of BCZ are closely related to the removal of solvent molecules from the crystalline powders upon heating. Moreover, uniform 1D microstructures of BCZ obtained by solvent exchange in solution exhibit optical waveguide property with low optical loss.
Synthesis and application of colorimetric carbazole fluorescent probe for detecting hydrogen sulfide
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Paragraph 0015, (2018/12/13)
The invention belongs to the technical field of a fluorescent probe, and provides synthesis and application of a colorimetric carbazole fluorescent probe for detecting hydrogen sulfide. The fluorescent probe is 5-chlorine-2-cyano-5-[3-(9-ethyl carbazole)] penta-2,4-ethyl dienoate. 3-acetyl-N-ethyl carbazole is synthesized by using N-ethyl carbazole as a raw material; 3-chlorine-3-[3-(9-ethyl carbazole)] acraldehyde is synthesized; and the 3-chlorine-3-[3-(9-ethyl carbazole)] acraldehyde and ethyl cyanoacetate are dissolved into absolute ethyl alcohol, a catalyst piperidine is added to performa reaction and obtain a crude product, and the crude product is dried to recrystallize the absolute ethyl alcohol, thereby obtaining the fluorescent probe. The probe reacts with the hydrogen sulfide to cause changes of a fluorescence signal and a solution color, and naked eye detection on the hydrogen sulfide can be implemented. The probe has excellent selectivity, is high in detection sensitivity, has a detection limit of 0.16 muM, and can be used for detecting the hydrogen sulfide in cells and chlorella by combining a laser confocal scanning microscopical technique.
Fluorescent probe of reversible sulfur dioxide/sulphurous acid (hydrogen) salt
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Paragraph 0025; 0026, (2018/06/16)
The invention provides a fluorescent probe of reversible sulfur dioxide/sulphurous acid (hydrogen) salt, with the chemical name of 7-diethylin-2-(9-ethyl-9H-carbazole-3) benzo iso-pyran oxonium ion. The fluorescent probe can detect sulfur dioxide/sulphurous acid (hydrogen) salt in a solution, cells, tissues or a living body, wherein the living body includes fish, mice, rat, guinea pig and rabbit;and reversibility is realized by formaldehyde. The fluorescent probe is simple in synthesis steps, easily available in material, high in yield and suitable for industrial application.
