Aggregation induced emission and mechanochromism in pyrenoimidazoles

2015 ◽  
Vol 3 (38) ◽  
pp. 9981-9988 ◽  
Author(s):  
Thaksen Jadhav ◽  
Bhausaheb Dhokale ◽  
Shaikh M. Mobin ◽  
Rajneesh Misra
Keyword(s):  
Solid State ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Color Contrast ◽  
Aggregation Induced Emission ◽  
Cross Coupling Reaction

Pyrene-based solid state emitters 3a and 3b were designed and synthesized by the Pd-catalyzed Suzuki cross-coupling reaction. Pyrenoimidazoles 3a and 3b exhibit strong AIE and reversible mechanochromic behavior with color contrast between blue and green.

T-Shaped donor–acceptor–donor type tetraphenylethylene substituted quinoxaline derivatives: aggregation-induced emission and mechanochromism

2017 ◽  
Vol 41 (17) ◽  
pp. 9346-9353 ◽  
Author(s):  
Anupama Ekbote ◽  
Thaksen Jadhav ◽  
Rajneesh Misra
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Aggregation Induced Emission ◽  
Cross Coupling Reaction ◽  
Quinoxaline Derivatives ◽  
Donor Type ◽  
Donor Acceptor

T-Shaped D–A–D type tetraphenylethylene (TPE) substituted acenapthene-quinoxaline1and TPE substituted phenanthrene quinoxaline2were synthesized by the Suzuki cross-coupling reaction and exhibits highly reversible mechanochromic behavior.

scholarly journals Carbazole- and Triphenylamine-Substituted Pyrimidines: Synthesis and Photophysical Properties

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1742 ◽  
Author(s):  
Sylvain Achelle ◽  
Julián Rodríguez-López ◽  
Massinissa Larbani ◽  
Rodrigo Plaza-Pedroche ◽  
Françoise Robin-le Guen
Keyword(s):  
Solid State ◽  
Blue Light ◽  
Photophysical Properties ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Pyrimidine Derivatives ◽  
Absorption Bands ◽  
Cross Coupling Reaction

A series of pyrimidine derivatives bearing one, two or three triphenylamine/9-ethylcarbazole substituents has been synthesized by Suzuki cross-coupling reaction. All compounds showed absorption bands in the UV region and the emission of violet-blue light upon irradiation. Protonation led to quenching of the fluorescence, although some derivatives remained luminescent with the appearance of a new red-shifted band in the spectra. Accurate control of the amount of acid enabled white photoluminescence to be obtained both in solution and in solid state.

scholarly journals Synthesis and Photophysical Properties of Substituted Pyrimidines

2019 ◽  
Author(s):  
Sylvain Achelle ◽  
Julián Rodríguez-López ◽  
Massinissa Larbani ◽  
Rodrigo Plaza-Pedroche ◽  
Françoise Robin-le Guen
Keyword(s):  
Solid State ◽  
Blue Light ◽  
Photophysical Properties ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Pyrimidine Derivatives ◽  
Absorption Bands ◽  
Cross Coupling Reaction

A series of pyrimidine derivatives bearing one, two or three triphenylamine/9-ethylcarbazole substituents has been synthesized by Suzuki cross-coupling reaction. All compounds showed absorption bands in the UV region and the emission of violet-blue light upon irradiation. Protonation led to quenching of the fluorescence, although some derivatives remained luminescent with the appearance of a new red-shifted band in the spectra. Accurate control of the amount of acid enabled white photoluminescence to be obtained both in solution and in solid state.

Effect of the cyano group on solid state photophysical behavior of tetraphenylethene substituted benzothiadiazoles

2015 ◽  
Vol 3 (35) ◽  
pp. 9063-9068 ◽  
Author(s):  
Thaksen Jadhav ◽  
Bhausaheb Dhokale ◽  
Rajneesh Misra
Keyword(s):  
Solid State ◽  
Cyano Group ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Cross Coupling Reaction ◽  
Donor Acceptor ◽  
Photophysical Behavior

Two unsymmetrical tetraphenylethene (TPE) substituted Donor–Acceptor (D–A) benzothiadiazoles (BTDs) 3a, and 3b were designed and synthesized by the Suzuki cross-coupling reaction.

Ferromagnetic Chain Based on Verdazyl-Nitroxide Diradical

2020 ◽  
Author(s):  
Evgeny Tretyakov ◽  
Svetlana Zhivetyeva ◽  
Pavel Petunin ◽  
Dmitry Gorbunov ◽  
Nina Gritsan ◽  
...  
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Ferromagnetic Coupling ◽  
Nitronyl Nitroxide ◽  
Triplet Ground State ◽  
One Dimensional ◽  
Cross Coupling Reaction ◽  
Palladium Catalyzed ◽  
Ferromagnetic Chain ◽  
High Yields

<p>Verdazyl-nitroxide diradicals were synthesized using the palladium-catalyzed cross-coupling reaction of the corresponding iodoverdazyls with a nitronyl nitroxide-2-ide gold(I) complex with high yields (up to 82%). The synthesized diradicals were found to be highly thermally stable and have a singlet (D<i>E</i><sub>ST</sub> » -64 cm<sup>–1</sup>) or triplet ground state (D<i>E</i><sub>ST</sub> ³ 25 and 100 cm<sup>–1</sup>), depending on which canonical hydrocarbon diradical type they belong to. Upon crystallization, triplet diradicals form unique one-dimensional (1D) spin <i>S</i> = 1 chains of organic diradicals with intrachain ferromagnetic coupling of <i>J</i>′/<i>k</i><sub>B</sub> from 3 to 6 K.</p>

An Iron-Based Catalyst Enables The Enantioconvergent Synthesis of Chiral 1,1-Diarylalkanes Through a Suzuki-Miyaura Cross-Coupling Reaction

2020 ◽  
Author(s):  
Chet Tyrol ◽  
Nang Yone ◽  
Connor Gallin ◽  
Jeffery Byers
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Radical Intermediates ◽  
Cross Coupling Reactions ◽  
Cross Coupling Reaction ◽  
Boronic Esters ◽  
Carbon Centered Radical ◽  
Iron Based ◽  
High Yields

By using an iron-based catalyst, access to enantioenriched 1,1-diarylakanes was enabled through an enantioselective Suzuki-Miyaura crosscoupling reaction. The combination of a chiral cyanobis(oxazoline) ligand framework and 1,3,5-trimethoxybenzene additive were essential to afford high yields and enantioselectivities in cross-coupling reactions between unactivated aryl boronic esters and a variety of benzylic chlorides, including challenging ortho-substituted benzylic chloride substrates. Mechanistic investigations implicate a stereoconvergent pathway involving carbon-centered radical intermediates.

Ni(0)-Catalyzed α-Allylic Alkylation of Regular Ketones with 1,3-Dienes under pH and Redox-neutral Conditions

2019 ◽  
Author(s):  
Tiantian Chen ◽  
Yang Yang ◽  
Liyu Xie ◽  
Haijian Yang ◽  
Guangbin Dong ◽  
...  
Keyword(s):  
Oxidative Addition ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Dual Role ◽  
Allylic Alkylation ◽  
Cross Coupling Reaction ◽  
Neutral Conditions

<p>We report a Ni(0)-catalyzed cross coupling reaction between simple ketones and 1,3-dienes. A variety of a-allylic alkylation products were formed in an 1,2-addition manner with excellent regioselectivity. Water was found to significantly accelerate this transformation. A HO-Ni-H species generated from oxidative addition of Ni(0) to H<sub>2</sub>O is proposed to play a “dual role” in activating both the ketone and the diene substrate.</p>

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