- Proton-Coupled Electron Transfer (PCET) with 1,4-Bisguanidino-Benzene Derivatives: Comparative Study and Use in Acid-Initiated C-H Activation
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Proton-coupled electron transfer (PCET) is of key importance in modern synthetic chemistry. Redox-active guanidines were established by our group as valuable alternatives to toxic high-potential benzoquinones in a variety of different PCET reactions. In t
- Walter, Petra,Hübner, Olaf,Kaifer, Elisabeth,Himmel, Hans-J?rg
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- Charge-transfer complexations of 1,n-di(9-ethylcarbazol-3-yl)alkanes with tetracyanoethylene and tetranitromethane
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1,n-Di(9-ethylcarbazol-3-yl)alkanes, where n = 1-5, as the dichromophoric model compounds of poly-3-vinylcarbazoles were synthesized to examine their complexation behaviors with the electron acceptors tetracyanoethylene (TCNE) and tetranitromethane (TNM). 9,9′-Diethyl-3,3′-dicarbazolyl, di(3-ethylcarbazol-9-yl)methane, and three monomeric analogues were also included for comparison. In dichloromethane solution, the dicarbazoles formed stable 1:1 electron donor-acceptor complexes with TCNE having formation enthalpies around -3.5 kcal/mol. With TNM they formed more weakly bound complexes that showed little dependence on concentration and almost zero dependence on temperature changes having nearly 0 kcal/mol enthalpies of formation. The smaller gap between the two carbazole groups in 1,n-di(9-ethylcarbazol-3-yl)alkanes with n ≤ 2 affected complexation adversely, while such an effect was not observed in the dicarbazoles with n ≥ 3.
- Asker, Erol,Masnovi, John
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- Synthesis and electrochemical properties of N-substituted bicarbazyl derivatives
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N,N′-Diethyl-3,3′-bicarbazyl (DEBC)and N,N′-Diphenyl-3,3′-bicarbazyl (DPBC) was synthesized by the oxidative coupling reaction. The electrochemical properties of DEBC and DPBC were characterized by cyclic voltammetric technique. The oxidation of DEBC occu
- Kim, Yeong Eun,Kwon, Young Soon,Lee, Kwang Soon,Park, Jong Wook,Seo, Hyeon Jin,Kim, Tae Wan
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- Oxidative Coupling of Carbazoles: A Substituent-Governed Regioselectivity Profile
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Oxidative C-C coupling of carbazoles possessing various substituents is demonstrated in the presence of organic (metal-free) recyclable oxidants, such as DDQ or CA/H+, for accessing bicarbazole regioisomers. Differently substituted carbazoles are examined to showcase regioselective discrimination (3,3′-versus 1,3′-bicarbazoles) and preferences based on sterics and electronics in oxidative coupling. Finally, a mechanism that involves the carbazole radical cation has been traced (evidenced) and proposed on the basis of the UV-vis-NIR absorption and EPR spectroscopy results. This study underlines the strategic chemical preparation of a series of bicarbazoles in an efficient manner.
- Mallick, Sudesh,Maddala, Sudhakar,Kollimalayan, Kalidass,Venkatakrishnan, Parthasarathy
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- Bicarbazolyl-containing oxime ester compound and preparation method and application thereof
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The invention provides a bicarbazolyl-containing oxime ester compound as well as a preparation method and application of the bicarbazolyl-containing oxime ester compound. The general formula of the oxime ester compound is shown in the specification, and R
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Paragraph 0109-0113
(2019/08/01)
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- DYE FOR DYE SENSITIZED SOLA CELL COMPRISING BICARBAZOLE DERIVATIVES AND SOLA CELL COMPRISING IT
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The present invention refers to carbazole bicarbonate salts including derivatives (bi-carbazole) and dye compounds for solar cell including dye-sensitized solar cell relates to.
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Paragraph 0052-0056
(2016/10/10)
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- Polymer and organic light emitting device including polymer
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A polymer and an organic light-emitting device including the polymer are provided, wherein the polymer comprises a polymeric unit represented by the Formula: In which variables are as defined herein.
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Page/Page column 29; 30
(2013/11/04)
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- Comparaison des proprietes de conduction du 9,9'-diethyle-3,3'-dicarbazyle et de poly(3,6-N-alkylcarbazolediyl). II. Syntheses et proprietes du dimere
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In order to compare electronic conduction properties of 9,9'-diethyl-3,3'-dicarbazyl (DEDCZ) with those of corresponding polymers, first, we described two convenient synthesis of DEDCZ.Then, we shown that optical spectroscopy allowed to follow chemical doping of both DEDCZ and polymer in dilute solution by ferric salts.The same electronic conductivity level was measured for the two compounds with a given doping substrate.So, we can assume that diade is a determining structural unit in the case of carbazolic compounds for conducting properties.This result seems confirm as electrochemical behaviour of both DEDCZ and polymer is similar in the presence of several supporting electrolytes.
- Kham, K.,Sadki, S.,Chevrot, C.
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p. 823 - 826
(2007/10/02)
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- Homo- et co-polymerisations oxydantes du carbazole et du thiophene substitues
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Chemical oxidation of N-ethylcarbazole by FeCl3 quantitatively yields dimer.Oxidation is the rate-determining step among the three elementary reactions involved in the process.Oxidation of 3-octylthiophene in the same conditions, leads to the formation very rapidly of high molecular weights through the coupling of oligomeric active species.Copolymerization of the monomers by FeCl3 gives rise to materials whose solubility and thermochromism depend on the composition and therefore can be tuned.
- Siove, A.,David, R.,Ades, D.,Roux, C.,Leclerc, M.
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p. 787 - 790
(2007/10/02)
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