- Synthesis and characterization of six N-(long-alkyl)-carbaldehyde
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Six carbazole aldehyde compounds were synthesized and characterized by 1H NMR, UV-Vis, and IR spectroscopy. Fluorescence spectroscopy was also discussed, and they all have strong fluorescence. The thermal properties of compounds were studied by TGA-DTA. The compounds are considered to be promising and assistant materials for organic photo-electronic functional materials. Copyright Taylor & Francis Group, LLC.
- Shi, Jian Hui,Yu, Miao,Jian, Wen Ping,Zhang, Yu Jing
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- Synthesis and Physicochemical Properties of New Chalcones Containing a 2-Chloroimidazo[1,2-a]pyridine Fragment
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Abstract: New chalcones containing a 2-chloroimidazo[1,2-a]pyridine fragment have been synthesized, and their optical properties have been studied. The Stokes shifts, forbidden band gap widths, molar absorption coefficients, and fluorescence quantum yields have been determined on the basis of their absorption and emission spectra. Introduction of an additional thiophene fragment into the chalcone molecules produced an increase of the Stokes shift, red shift of the emission maximum, and sharp increase of the quantum yield (up to 22%). The synthesized chalcones showed high thermal stability and good film-forming properties, and films obtained therefrom exhibited an ordered structure.
- Abashev, G. G.,Chukhlantseva, A. N.,Ermolov, D. A.,Lunegov, I. V.,Mokrushin, I. G.,Shklyaeva, E. V.
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p. 1940 - 1947
(2022/01/24)
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- Design, synthesis, and biological evaluation of novel carbazole aminothiazoles as potential DNA-targeting antimicrobial agents
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A series of novel carbazole aminothiazoles as a new type of antimicrobial agents were designed, synthesized and characterized by 1H NMR, 13C NMR, IR, MS and HRMS spectra. Some of the carbazole aminothiazoles exhibited good antimicrobial activities; particularly, heptyl-derived carbazole aminothiazole 4f could effectively inhibit the growth of MRSA with an MIC value of 4 μg mL-1, which was superior to the reference drugs Chloromycin and Norfloxacin. Moreover, cytotoxicity investigation indicated that bioactive compound 4f did not exhibit cytotoxicity to Hep-2 cells within its MIC against MRSA. Preliminary interactive investigation revealed that compound 4f could effectively intercalate into calf thymus DNA to form 4f-DNA complexes which might block DNA replication and thus exert antimicrobial activities. In addition, the binding behavior of compound 4f to DNA revealed that compound 4f could interact with DNA by hydrogen bonds and electrostatic interactions.
- Addla, Dinesh,Wen, Si-Qi,Gao, Wei-Wei,Maddili, Swetha Kameswari,Zhang, Ling,Zhou, Cheng-He
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p. 1988 - 1994
(2016/10/22)
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- A large dipole moment to promote gelation for 4-nitrophenylacrylonitrile derivatives with gelation-induced emission enhancement properties
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A series of 4-nitrophenylacrylonitrile and phenylacrylonitrile derivatives consisting of a carbazole moiety was synthesized. Some of these derivatives with longer alkyl chains and a nitro group could gelatinize some organic solvents, such as ethanol, n-butanol, ethyl acetate, and DMSO. By contrast, phenylacrylonitrile derivatives did not form gels in measured solvents. This result proved that the electron-withdrawing nitro moiety was important for gel formation because it conferred the molecules with large dipole moments, which enhanced the intermolecular interaction. Analyses by UV-vis absorption, X-ray diffraction, and scanning electron microscopy showed that the gelator molecules could self-assemble into one-dimensional nanofibers with layer packing, which further twisted into thicker fibers and formed three-dimensional networks in the gel phase. The single crystal structure of C4CNPA implied that the gelators might adopt an anti-parallel molecular stacking because of their larger ground-state dipole moment. Interestingly, the organogels had enhanced fluorescence relative to solutions at the same concentrations. This journal is the Partner Organisations 2014.
- Xue, Pengchong,Yao, Boqi,Zhang, Yuan,Chen, Peng,Li, Kechang,Liu, Baijun,Lu, Ran
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p. 7110 - 7118
(2014/10/16)
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- Highly Active Multidentate Catalysts for Efficient Alkyne Metathesis
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The invention relates to highly active and selective catalysts for alkyne metathesis. In one aspect, the invention includes a multidentate organic ligand wherein one substrate-binding site of the metal center is blocked. In another aspect, the invention includes N-quaternized or silane-based multidentate organic ligands, capable of binding to metals. In yet another aspect, the invention includes N-quaternized or silane-based multidentate catalysts. The catalysts of the invention show high robustness, strong resistance to small alkyne polymerization and significantly enhanced catalytic activity compared to their corresponding non-quaternized or non-silane-based multidentate catalyst analogues.
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Paragraph 0024; 0201
(2013/10/08)
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- Highly active multidentate alkyne metathesis catalysts: Ligand-activity relationship and their applications in efficient synthesis of porphyrin-based aryleneethynylene polymers
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A series of tris(arylmethyl)ammonium-coordinated molybdenum(VI) propylidyne catalysts was synthesized. Such N-quarternized multidentate catalysts showed high robustness, strong resistance to small alkyne polymerization and significantly enhanced catalytic activity compared to their corresponding tris(arylmethyl)amine-based analogues. The high activity of these new catalysts also enabled the efficient synthesis of ethynylene-bridged porphyrin-based arylene ethynylene polymers via alkyne metathesis, which represents a highly efficient, defect-free, viable approach for the synthesis of this class of intriguing polymers. Copyright
- Jyothish, Kuthanapillil,Wang, Qi,Zhang, Wei
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supporting information
p. 2073 - 2078,6
(2020/09/02)
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- Introducing a podand motif to alkyne metathesis catalyst design: A highly active multidentate molybdenum(VI) catalyst that resists alkyne polymerization
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Podand prevents polymers: The molybdenum(VI) propylidyne catalyst 1 with a podand triphenolamine ligand shows high activity in the metathesis of a variety of alkyne substrates, including heterocycles that contain donor moieties. With one substrate-binding site blocked by the multidentate ligand, the undesired polymerization of small alkynes that occurs with non-podand-ligand complex 2 is completely inhibited. Copyright
- Jyothish, Kuthanapillil,Zhang, Wei
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supporting information; scheme or table
p. 3435 - 3438
(2011/05/04)
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- Luminescent organic 1D nanomaterials based on Bis(β-diketone)carbazole derivatives
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A series of new triphenylamine-functionalized bis(β-diketone)s bridged by a carbazole (CnBDKC, n=1, 4, 8, 16) with twisted intramolecular charge-transfer emission in polar solvents has been synthesized. The length of the carbon chains has a significant effect on the self-assembling properties of the compounds. Well-defined 1D nanowires were easily generated from C1BDKC with a methyl group by a reprecipitation approach directed by π-stacking interaction, and the molecules packed into J-aggregates in the nanowires. In addition, 1D nanofibers based on C16BDKC bearing a long hexadecyl chain were prepared through the organogelation process, and H-aggregates were formed driven by the synergistic effect of π-stacking interaction and van der Waals force in the gel phase. C4BDKC and C8BDKC containing butyl and octyl side chains, respectively, cannot arrange into dispersed nanostructures, probably because π-π interaction between conjugated moieties might be disturbed by the interaction between the side chains, which is, however, not strong enough to dominate the self-assembling process. Notably, the nanowires based on C1BDKC and the gel nanofibers from C16BDKC can emit strong green light under irradiation, which suggests that these 1D nanomaterials may have potential applications in emitting materials as well as photonic devices. Given the green light: Well-defined 1D nanowires and nanofibers have been fabricated by reprecipitation and organogelation from triphenylamine-functionalized bis(β-diketone)s bridged by carbazole with alkyl chains of different length (CnBDKC, n=1, 16, respectively; see picture). The nanostructures give strong green fluorescent emission.
- Liu, Xingliang,Xu, Defang,Lu, Ran,Li, Bin,Qian, Chong,Xue, Pengchong,Zhang, Xiaofei,Zhou, Huipeng
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experimental part
p. 1660 - 1669
(2011/03/22)
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- Novel diethynylcarbazole macrocycles: Synthesis and optoelectronic properties
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Diethynylcarbazole macrocycles 1b and 2b have been synthesized by oxidative coupling of appropriate precursors. In particular, macrocycle 2b was prepared by bimolecular Pd-catalyzed oxidative coupling in 35% isolated yield. The spectroscopic properties of these macrocycles and their precursors were measured in detail. The films of these macrocycles by the dipping method and the Langmuir-Blodgett technique were fabricated to study their photoinduced charge-transfer properties. A rapid and steady cathodic photocurrent of these films was produced in a three-electrode cell when irradiated with white light. A possible mechanism of the photoinduced electron-transfer pathway was suggested.
- Zhao, Tianyue,Liu, Zhanxiang,Song, Yabin,Xu, Wei,Zhang, Deqing,Zhu, Daoben
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p. 7422 - 7432
(2007/10/03)
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- Light-Induced Electron Transfer of Porphyrin Triad for Photoelectric Conversion
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Two new triad model compounds of porphyrin-viologen-carbazole (1a and 1b) with different chain length were synthesized to mimic photosynthesis.The absorption and fluorescence spectra in solution, in micelle solution as well as in binary solvent, were inve
- Wang, Xiang Dong,Zhang, Bao Wen,Bai, Jian Wei,Cao, Yi,Xiao, Xu Rui,Xu, Jing Mei
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p. 2886 - 2891
(2007/10/02)
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