Synthesis of Poly(2,7‐carbazole)s and Derivatives

Boudreault, Pierre‐Luc; Morin, Jean‐François; Leclerc, Mario

doi:10.1002/9783527629787.ch6

Cited by 13 publications

(10 citation statements)

References 135 publications

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“…However, it is unclear what physical process would cause overproduction of massive stars in the first generation or underproduction in the second, and neither effect is significant enough to solve the mass budget problem. Additionally, observations of young star clusters (e.g., Boudreault & Caballero 2010;Gennaro et al 2010) do not find either of these effects, and present-day globular clusters do not contain unusually large populations of neutron stars or other compact remnants of massive firstgeneration stars relative to the number of low-mass firstgeneration stars still on the main sequence (e.g., Bogdanov et al 2010;Lorimer 2011).…”

Section: Current Models For Globular Cluster Formationmentioning

confidence: 99%

Light‐element abundance variations in globular clusters

Martell

2011

Astron Nachr

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Star-to-star variations in abundances of the light elements carbon, nitrogen, oxygen, and sodium have been observed in stars of all evolutionary phases in all Galactic globular clusters that have been thoroughly studied. The data available for studying this phenomenon, and the hypotheses as to its origin, have both co-evolved with observing technology; once high-resolution spectra were available even for main-sequence stars in globular clusters, scenarios involving multiple closely spaced stellar generations enriched by feedback from moderate- and high-mass stars began to gain traction in the literature. This paper briefly reviews the observational history of globular cluster abundance inhomogeneities, discusses the presently favored models of their origin, and considers several aspects of this problem that require further study.Comment: AN in press, 9 pages, Highlight talk from Astronomische Gesellschaft 2010 annual meetin

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Section: Current Models For Globular Cluster Formationmentioning

confidence: 99%

Light‐element abundance variations in globular clusters

Martell

2011

Astron Nachr

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“…The distinctive electronic environment of carbazoles and their analogues made them widely susceptible key motifs in the development of organic light-emitting materials . These are potential candidates for electronic devices, such as color display, organic semiconductor lasers, solar cells, etc .…”

Section: Introductionmentioning

confidence: 99%

Substrate-Controlled Regio- and Stereoselective Synthesis of (Z)- and (E)-N-Styrylated Carbazoles, Aza-carbazoles, and γ-Carbolines via Hydroamination of Alkynes

2018

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We report herein the substrate-controlled regio- and stereoselective hydroamination of carbazoles, aza-carbazoles, and γ-carbolines with functionalized aromatic as well as aliphatic alkynes in a KOH/DMSO system in good yields. The electronic effect of the substrates governs the stereochemistry of the product. Electron-donating alkynes provided ( Z)-stereoselective products, and electron-withdrawing alkynes provided ( E)-stereoselective products. This approach also provides an easy route for the synthesis of mono- and bis-hydroaminated product. The deuterium-labeling studies were also conducted to support the mechanistic pathway.

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“…Carbazole has fine optical properties, a low redox potential, and high chemical stability, and thereby oligo-/polycarbazoles have been representative benchmark materials in OFETs, OLEDs, and OSCs. − Poly(3,6-carbazole)s and 3,6-functionalized carbazoles have been extensively studied over the past few decades, because carbazole can be easily functionalized by electrophilic substitution at its 3,6-positions ( para positions from the nitrogen atom) with high electron density. The recent development in carbazole chemistry has also established the efficient synthetic pathways to 1,8- and 2,7-functionalized carbazoles, and their peculiar properties which are apparently different from those of 3,6-carbazole derivatives have been disclosed. ,, In this context, carbazole can be regarded as an important scaffold for the construction of π-functional materials due to its rich diversity in structural modification.…”

Section: Introductionmentioning

confidence: 99%

Systematic Structure–Property Investigations on a Series of Alternating Carbazole–Thiophene Oligomers

et al. 2014

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A series of alternating carbazole-thiophene oligomers, namely 2,7-linked carbazole-thiophene oligomers 1, 3, 5, 7, and 9 and 3,6-linked ones 2, 4, 6, 8, and 10, in which the molecular length was systematically elongated, were synthesized by Suzuki-Miyaura coupling reactions. The effects of the conjugation connectivity between the carbazole and thiophene moieties and the molecular length on the electronic, photophysical, and electrochemical properties of 1-10 were comprehensively investigated. In the present oligomer architectures, the connection with thiophene at the 2,7-positions of carbazole ensures π-conjugation to a high extent and high fluorescence quantum yields, while that at the 3,6-positions enhances the donor ability. The increase in the molecular length of the 2,7-linked oligomers effectively extends π-conjugation. The relationship between structural variations and photophysical properties was examined by fluorescence lifetime measurements in detail. The X-ray crystal structure of 6 was also disclosed.

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Synthesis of Poly(2,7‐carbazole)s and Derivatives

Cited by 13 publications

References 135 publications

Light‐element abundance variations in globular clusters

Light‐element abundance variations in globular clusters

Substrate-Controlled Regio- and Stereoselective Synthesis of (Z)- and (E)-N-Styrylated Carbazoles, Aza-carbazoles, and γ-Carbolines via Hydroamination of Alkynes

Systematic Structure–Property Investigations on a Series of Alternating Carbazole–Thiophene Oligomers

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