Bibliografías temáticas / Diphenyl carbazone

Literatura académica sobre el tema "Diphenyl carbazone"

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Publicado: 18 de mayo de 2024

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Artículos de revistas sobre el tema "Diphenyl carbazone"

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Maniasso, Nelson y Elias A. G. Zagatto. "Flow-injection spectrophotometric catalytic determination of manganese in plants exploiting the aerial oxidation of diphenyl carbazone". Analytica Chimica Acta 366, n.º 1-3 (junio de 1998): 87–92. http://dx.doi.org/10.1016/s0003-2670(97)00682-x.

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Kalogirou, Andreas S. y Panayiotis A. Koutentis. "5,5′-Bis[9-(2-ethylhexyl)-9H-carbazol-3-yl]-4,4′-diphenyl-2,2′-bithiazole". Molbank 2024, n.º 1 (11 de enero de 2024): M1761. http://dx.doi.org/10.3390/m1761.

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Stille coupling between 5,5′-dibromo-4,4′-diphenyl-2,2′-bithiazole and 9-(2-ethylhexyl)-3-(tributylstannyl)-9H-carbazole in the presence of Pd(Ph3P)2Cl2 in toluene, heated at reflux for 2 h, gave 5,5′-bis[9-(2-ethylhexyl)-9H-carbazol-3-yl]-4,4′-diphenyl-2,2′-bithiazole in 85% yield.
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Zhang, Zunting, Yang Kang, Rong Hou, Xiaoyan Min, Tao Wang y Yong Liang. "An Oxidant- and Catalyst-Free Synthesis of Dibenzo[a,c]carbazoles via UV Light Irradiation of 2,3-Diphenyl-1H-indoles". Synthesis 54, n.º 06 (23 de octubre de 2021): 1621–32. http://dx.doi.org/10.1055/a-1677-4881.

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AbstractAn efficient methodology for the synthesis of dibenzo[a,c]carbazoles via annulation of 2,3-diphenyl-1H-indoles in EtOH under UV light irradiation (λ = 365 nm) along with hydrogen evolution is described. This method exhibits the advantages of mild reaction conditions, no requirement of any oxidants and catalysts, and release of hydrogen as the only byproduct. Notably, the mechanism investigation confirms that the trans-4b,8a-dihydro-9H-dibenzo[a,c]carbazole intermediate could convert into cis-4b,8a-dihydro-9H-dibenzo[a,c]carbazole, which relies on the nitrogen atom of the indole ring. This is followed by intramolecular dehydrogenation which yields the dibenzo[a,c]carbazoles.
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Çiçek, Baki, Merve Çağlı, Remziye Tülek y Ali Teke. "Synthesis and optical characterization of bipod carbazole derivatives". Heterocyclic Communications 26, n.º 1 (18 de octubre de 2020): 148–56. http://dx.doi.org/10.1515/hc-2020-0111.

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AbstractIn this study, some new biscarbazole derivatives were synthesized for the purpose of being used in OLED technologies and related areas. The following compounds: {1,2-bis(2-(3,6-diphenyl-9H-carbazole-9-yl) ethoxy)ethane (C-1), bis[2-(2-(3,6- diphenyl-9H-carbazole-9-yl) ethoxy)etyl]ether (C-2), bis[2-(2-(3,6-di(naphthalene-1-yl)-9H-carbazol-9-yl)ethoxy)etyl]ether (C-3) and bis [2-(2-(3,6-di(naphthalene-2-yl)-9H-carbazol-9-yl)ethoxy) ethyl]ether (C-4) were synthesized by Suzuki-Miyaura Cross Coupling reactions. The structural properties of the synthesized compounds were characterized by FT-IR, 1H-NMR, 13C-NMR, and LC-MS. The maximum product yields of 81.6% were obtained for C-4 biscarbazole derivatives. The optical properties were studied using UV-visible and temperature/excitation power density dependent photoluminescence (PL) techniques. The emissions were observed at green and yellow-red color spectral bands. By applying Gaussian fitting to the measured spectra, the superposition of the broad peaks was deconvoluted into two peaks. The origin of emissions was attributed to π- π* transition in aromatic compounds caused by intramolecular charge transfer from host carbazole to these compounds.
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Guo, Huixia, Xiaohua Xi, Renxiang Yan y Xiaoquan Lu. "Theoretical study on the effect of different π-linker on the performance of sensitizer in carbazole-based dyes". Journal of Theoretical and Computational Chemistry 17, n.º 02 (marzo de 2018): 1850019. http://dx.doi.org/10.1142/s0219633618500190.

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Derived from diarylamine sensitizer diphenyl-(7-pyridin-4-yl-9H-carbazol-2-yl)-amine (N13), a series of novel D[Formula: see text]A carbazole-based organic dye sensitizers with different [Formula: see text]-linkers were designed for searching more effective sensitizers in dye-sensitized solar cells (DSSCs) design. Optimized geometries, electronic structure, and other parameters, which can evaluate the performance of DSSCs effectively and intuitively, were theoretically calculated by density functional theory (DFT) and time-dependent DFT methods at the M06/6-31G(d,p) level. The results indicated that the maximum absorption wavelength of designed dye was red-shifted and the molar absorption coefficient ([Formula: see text]) became higher. This phenomenon can be explained by the modification of the [Formula: see text]-bridge. The simulated Ultraviolet–visible spectroscopy (UV-Vis) absorption spectrum showed that the designed N,N-diphenyl-7-(5-(7-(5-(pyridin-4-yl)thiophen-2-yl)benzo[c][1,2,5]thiadiazol-4-yl)thiophen-2-yl)-9H-carbazol-2-amine (N22) dye presents the largest red-shifted absorption band and the designed (E)-N,N-diphenyl-7-(2-(5[Formula: see text]-(pyridin-4-yl)-[2,2[Formula: see text]-bithiophene]-5-yl)vinyl)-9H-carbazol-2-amine (N21) dye showed the largest [Formula: see text], both of them depicted a high short-circuit photocurrent density ([Formula: see text]. Meanwhile, the charge separation hampered by long [Formula: see text]-linkers was also observed. These results are helpful for designing new sensitizers and providing effective guiding to experimental synthesis.
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Xiao, Zhanhai, Yi Di, Zhifang Tan, Xudong Cheng, Bing Chen y Jiwen Feng. "Efficient organic dyes based on perpendicular 6,12-diphenyl substituted indolo[3,2-b]carbazole donor". Photochemical & Photobiological Sciences 15, n.º 12 (2016): 1514–23. http://dx.doi.org/10.1039/c6pp00286b.

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Three novel indolo[3,2-b]carbazole-based dyes have been designed and synthesized using a 6,12-diphenyl substituted indolo[3,2-b]carbazole as a donor, a thiophene cyanoacrylic acid moiety as electron acceptor and anchoring group, together with triphenylamine, 3,4,5-trimethoxybenzene and bromine as a second donor.
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Zhang, Zhaohang, Wei Jiang, Xinxin Ban, Min Yang, Shanghui Ye, Bin Huang y Yueming Sun. "Solution-processed efficient deep-blue fluorescent organic light-emitting diodes based on novel 9,10-diphenyl-anthracene derivatives". RSC Advances 5, n.º 38 (2015): 29708–17. http://dx.doi.org/10.1039/c5ra00627a.

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Mekuskiene, Giedrute, Sigitas Tumkevicius y Povilas Vainilavicius. "5-(4,6-Diphenyl-2-pyrimidinyl)-1,3,4-oxa(thia)diazoles and 1,2,4-triazoles". Journal of Chemical Research 2002, n.º 5 (mayo de 2002): 213–15. http://dx.doi.org/10.3184/030823402103171898.

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Synthesis of 5-(4,6-diphenyl-2-pyrimidinyl)-1,3,4-oxa(thia)diazoles and corresponding 1,2,4-triazoles from 4,6-diphenyl-2-pyrimidinecarboxylic acid hydrazide and 1-(4,6-diphenyl-2-pyrimidinylcarbonyl)-4-phenylthiosemi-carbazide is described.
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Liu, Bei, Zheng Chen, Liming Lin, Yuntao Han, Jinhui Pang y Zhenhua Jiang. "Synthesis and characterization of poly(arylene ether ketone)s with 3,6-diphenyl-9H-carbazole pendants using C–N coupling reaction". High Performance Polymers 29, n.º 5 (29 de junio de 2016): 575–84. http://dx.doi.org/10.1177/0954008316655592.

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3,6-Diphenyl-9 H-carbazole pendants are grafted herein to poly(arylene ether ketone)s (PAEKs) via the Ullmann C–N coupling reaction. To the best of our knowledge, this is the first time that PAEKs containing a carbazole pendant (Cz) have been synthesized through the Ullmann C–N coupling reaction. The high molecular weights of PAEK-Cz (PAEKs with 3,6-diphenyl-9 H-carbazole pendants) are inherited from their precursors, owing to the high reactivity of their monomers. The obtained PAEK-Cz- x polymers exhibit good solubility in most common organic solvents and excellent thermal stabilities, with the 5% weight loss temperatures for all products being above 598°C under a nitrogen atmosphere. The glass transition temperatures are all above 199°C and can be controlled by adjusting the feed ratio of monomers. The polymer membranes obtained by the casting method are tough and thus have strong potential for practical applications.
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Dhar, Abhishek, Nadavala Siva Kumar, Mohammad Asif y Rohit L. Vekariya. "Fabrication of D–π–A sensitizers based on different donors substituted with a dihydropyrrolo[3,4-c]pyrrole-1,4-dione bridge for DSSCs: influence of the CDCA co-absorbent". New Journal of Chemistry 42, n.º 14 (2018): 12024–31. http://dx.doi.org/10.1039/c8nj00847g.

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The effect of co-absorbance on the performance of DSSC devices with a new design of dimer sensitizers possessing a 2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (DPP) bridge and various donor groups (carbazole, diphenyl amine, indole) are reported in the present work.
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Tesis sobre el tema "Diphenyl carbazone"

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Tollbäck, Petter. "Large Volume Injection and Hyphenated Techniques for Gas Chromatographic Determination of PBDEs and Carbazoles in Air". Doctoral thesis, Stockholm University, Department of Analytical Chemistry, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-367.

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This thesis is based on studies in which the suitability of various gas chromatography (GC) injection techniques was examined for the determination of polybrominated diphenyl ethers (PBDEs) and carbazoles, two groups of compounds that are thermally labile and/or have high boiling-points. For such substances, it is essential to introduce the samples into the GC system in an appropriate way to avoid degradation and other potential problems. In addition, different types of gas chromatographic column system and mass spectrometric detectors were evaluated for the determination of PBDEs.

Conventional injectors, such as splitless, on-column and programmed temperature vaporizing (PTV) injectors were evaluated and optimized for determination of PBDEs. The results show on-column injection to be the best option, providing low discrimination and high precision. The splitless injector is commonly used for “dirty” samples. However, it is not suitable for determination of the high molecular weight congeners, since it tends to discriminate against them and promote their degradation, leading to poor precision and accuracy. The PTV injector appears to be a more suitable alternative. The use of liners reduces problems associated with potential interferents such as polar compounds and lipids and compared to the hot splitless injector, it provides gentler solvent evaporation, due to its temperature programming feature, leading to low discrimination and variance.

Increasing the injection volume from the conventional 1-3 µL to >50 µL offers two main benefits. Firstly, the overall detection and quantification limits are decreased, since the entire sample extract can be injected into the GC system. Secondly, large volume injections enable hyphenation of preceding techniques such as liquid chromatography (LC), solid phase extraction and other kinds of extraction. Large-volume injections were utilized and optimized in the studies included in this thesis.

With a loop-type injector/interface large sample volumes can be injected on-column providing low risk of discrimination against compounds with low volatility. This injector was used for the determination of PBDEs in air and as an interface for the determination of carbazoles by LC-GC. Peak distortion is a frequently encountered problem associated with this type of injector that was addressed and solved during the work underlying this thesis.

The PTV can be used as a large volume injector, in so-called solvent vent mode. This technique was evaluated for the determination of PBDEs and as an interface for coupling dynamic sonication-assisted solvent extraction online to GC. The results show that careful optimization of the injection parameters is required, but also that the PTV is robust and yields reproducible results.

PBDEs are commonly detected using mass spectrometry in electron capture negative ionization (ECNI) mode, monitoring bromine ions (m/z 79 and 81). The mass spectrometric properties of the fully brominated diphenyl ether, BDE-209, have been investigated. A high molecular weight fragment at m/z 486/488 enables the use of 13C-labeled BDE-209 as an internal surrogate standard.

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RAMADAN, DOAA REDA MOHAMED. "PALLADIUM CATALYZED REACTIONS: REDUCTIVE CYCLIZATION OF NITROARENES, AND OXIDATIVE CARBONYLATION OF ANILINE". Doctoral thesis, Università degli Studi di Milano, 2021. http://hdl.handle.net/2434/819652.

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Palladium Catalyzed Reactions: Reductive Cyclization of Nitroarenes, and Oxidative Carbonylation of Aniline Abstract: The thesis is divided into two main chapters: reductive cyclization of nitroarenes, and oxidative carbonylation of aniline. The first chapter involves developing a catalytic system for carbazoles synthesis through reductive cyclization of 2-nitrobiphenyls employing phenyl formate as an in-situ source of CO. Thus, the synthetic chemist can avoid handling pressurized CO lines and perform the reaction in a pressure tube, a cheap and readily available tool for any laboratory. Moreover, the developed protocol can tolerate both air and moisture and can be performed using undried and undistilled commercial DMF. Several carbazoles bearing a wide range of substituents were synthesized in good to excellent yields including some with valuable pharmaceutical or thermo/electrical applications. The reaction could be performed on the grams scale affording carbazole in a very good yield (85%) without the need for chromatographic purification, making our synthetic strategy even more attractive and economically advantageous. The second chapter deals with the palladium/iodide couple which is the most investigated catalytic system for the oxidative carbonylation of amines to give ureas or carbamates. In reinvestigating it, we found that the most prominent role of iodide is to etch the stainless steel of the autoclave employed in most of previous works, releasing in solution small amounts of iron salts. The latter are much better promoters than iodide itself. Iron and iodide have a complex interplay and, depending on relative ratios, can even deactivate each other. The presence of a halide is beneficial, but chloride is better than iodide in this respect. The ideal Fe/Pd ratio is around 10, but even an equimolar amount of iron with respect to palladium (0.02 mol% with respect to aniline, corresponding to 12 ppm Fe with respect to the whole solution) is sufficient to boost the activity of the catalytic system. Such small amount may also come from Fe(CO)5 impurities present in the CO gas when stored in steel tanks. The role of the solvent has also been investigated. It was found that the reason for the better selectivity in some cases is at least in part due to a hydrolysis of the solvent itself, which removes the coproduced water.
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Pham, Van Cang Christian. "Etude de la dynamique locale dans les polymeres en masse par l'analyse de la fluorescence de sondes excimeres". Paris 6, 1987. http://www.theses.fr/1987PA066195.

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Les molecules de meso di(n-carbazolyl)-2,4 pentane et oxyde de bis(phenyl-10 anthryl-9 methyl) servent de sondes fluorescentes pour l'analyse de la mobilite des chaines macromoleculaires de: polyoxydes de propene, polysiloxane, polybutadiene, polyisopropene et polyisobutene. Influence de la nature du polymere sur le mouvement de la sonde
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Capítulos de libros sobre el tema "Diphenyl carbazone"

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"Study of Chromium Complexation of Diphenyl Carbazide on Activated Carbon Fiber Surface". En Key Technologies in Polymer Chemistry, 181–88. Apple Academic Press, 2015. http://dx.doi.org/10.1201/b18033-25.

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Actas de conferencias sobre el tema "Diphenyl carbazone"

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Zhang, Chao, Qun Li y Shanfu Zhu. "A green methods to synthesise 4,4′- 2 carbazole diphenyl (CBP)". En GREEN ENERGY AND SUSTAINABLE DEVELOPMENT I: Proceedings of the International Conference on Green Energy and Sustainable Development (GESD 2017). Author(s), 2017. http://dx.doi.org/10.1063/1.4993016.

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Nishino, Junichi, Toshikazu Sekikawa, Haruka Otani, Hironori Ofuchi, Yosuke Taniguchi, Tetsuo Honma y Akio Bando. "Using Fluorescence XANES Measurement to Correct the Content of Hexavalent Chromium in Chromate Conversion Coatings Determined by Diphenyl Carbazide Color Test". En SYNCHROTRON RADIATION INSTRUMENTATION: Ninth International Conference on Synchrotron Radiation Instrumentation. AIP, 2007. http://dx.doi.org/10.1063/1.2436364.

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Furaha, Cyiza, Muhammad Bachri Amran y Maniriho Olivier. "Synthesis and application of amberlite XAD-16 diphenyl carbazide adsorbent chelating resin for solid-phase extraction of Cu (II) and Pb (II) ions from river water". En THE 9TH INTERNATIONAL CONFERENCE OF THE INDONESIAN CHEMICAL SOCIETY ICICS 2021: Toward a Meaningful Society. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0105301.

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