Bis(pentafluorophenyl)-o-carborane and its arylthio derivatives: synthesis, electrochemistry and optical properties

2020 ◽  
Vol 49 (37) ◽  
pp. 12985-12989
Author(s):  
Naoki Shida ◽  
Satoshi Owaki ◽  
Hiroshi Eguchi ◽  
Takanobu Nishikawa ◽  
Ikuyoshi Tomita ◽  
...  
Keyword(s):  
Optical Properties ◽  
Solid State ◽  
Nucleophilic Aromatic Substitution ◽  
Aromatic Substitution ◽  
Aggregation Induced Emission

The synthesis of bis(pentafluorophenyl)-o-carborane is reported, which is further thiolated by nucleophilic aromatic substitution (SNAr) reaction to give emissive materials in the solid state following aggregation-induced emission (AIE) fashion.

Controlling solid-state optical properties of stimuli responsive dimethylamino-substituted dibenzoylmethane materials

2017 ◽  
Vol 1 (9) ◽  
pp. 1804-1817 ◽  
Author(s):  
Tristan Butler ◽  
Fang Wang ◽  
Michal Sabat ◽  
Cassandra L. Fraser
Keyword(s):  
Optical Properties ◽  
Solid State ◽  
Stimuli Responsive ◽  
Aggregation Induced Emission ◽  
Color Range ◽  
Orange Color

Dimethylamino β-diketones with electron donating and withdrawing substituents displayed solvatochromism and aggregation induced emission. In the solid state, a blue to orange color range and thermal and mechanoresponsive properties were achieved.

Zur Reaktion von 2,3-Dihydroimidazol-2-ylidenen mit Pentafluorpyridin: Carbene als Reaktionspartner in der nucleophilen aromatischen Substitution/ On the Reaction of 2,3-Dihydroimidazol-2-ylidenes with Pentafluoropyridine: Carbenes as Reactants in Nucleophilic Aromatic Substitution

1998 ◽  
Vol 53 (8) ◽  
pp. 881-886 ◽  
Author(s):  
Norbert Kuhn ◽  
Joanna Fahl ◽  
Roland Boese ◽  
Gerald Henkel
Keyword(s):  
Solid State ◽  
Nucleophilic Aromatic Substitution ◽  
Aromatic Substitution ◽  
X Ray

Abstract The 2,3-dihydro-1,3,4,5-tetraalkylimidazol-2-ylidenes 3 (R = Me, iso-Pr) react immediately with pentafluoropyridine to form the 2-tetrafluoropyridylimidazolium salts 4 in good yields. In contrast with the tetramethyl derivative 4a, alkyl fluoride is eliminated from the isopropyl salt 4b to give 1 -isopropyl-4,5-dimethyl-2-tetrafluoropyridylimidazole, which dimerises via hydrogen bridges in the solid state (7). The X-ray structures of 1,3-diisopropyl-4,5-dimethyl-2-tetrafluoropyridylimidazolium chloride (5) and 7 are reported.

scholarly journals Aggregation Induced Emission and Nonlinear Optical Properties of an Intramolecular Charge-Transfer Compound

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1909
Author(s):  
Songhua Chen ◽  
Rui Luo ◽  
Xinyue Li ◽  
Meiyun He ◽  
Shanshan Fu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
Solid State ◽  
Nonlinear Optics ◽  
Nonlinear Optical ◽  
High Efficiency ◽  
Intramolecular Charge Transfer ◽  
Dye Sensitized Solar Cells ◽  
Nonlinear Optical Properties ◽  
Aggregation Induced Emission

Intramolecular charge transfer (ICT) compounds have attracted wide attention for their potential applications in optoelectronic materials and devices such as fluorescent sensors, dye-sensitized solar cells, organic light emitting diodes and nonlinear optics. In this work, we have synthesized a new ICT compound, dimethyl-[4-(7-nitro-benzo[1,2,5]thiadiazol-4-yl)-phenyl]-amine (BTN), and have fabricated it into low dimensional micro/nano structures with well-defined morphologies. These self-assembled nanostructures exhibit high efficiency solid state fluorescence via an aggregation induced emission mechanism, which overcomes the defect of fluorescence quenching caused by aggregation in the solid state of traditional luminescent materials. We also explored and studied the nonlinear optical properties of this material through the Z-scan method, and found that this material exhibits large third-order nonlinear absorption and refraction coefficients, which promises applications of the materials in the fields of nonlinear optics and optoelectronics.

Corroles bearing diverse coumarin units — synthesis and optical properties

2011 ◽  
Vol 15 (09n10) ◽  
pp. 1011-1023 ◽  
Author(s):  
Mariusz Tasior ◽  
Roman Voloshchuk ◽  
Yevgen M. Poronik ◽  
Tomasz Rowicki ◽  
Daniel T. Gryko
Keyword(s):  
Optical Properties ◽  
Spectroscopic Properties ◽  
Nucleophilic Aromatic Substitution ◽  
Sonogashira Coupling ◽  
Aromatic Substitution ◽  
Diverse Range ◽  
Efficient Approach ◽  
General Methodology ◽  
Direct Condensation

Two strategies were shown to be efficient in the construction of corroles with appended coumarin units. Direct condensation of formyl-coumarins with dipyrromethanes leads to a diverse range of trans-A2B-corroles in moderate yields. We showed that the strategy consisting of synthesis of various hydroxycoumarins followed by nucleophilic aromatic substitution with pentafluorobenzaldehyde and subsequent condensation of the resulting coumarin-aldehyde with dipyrromethanes is the most general methodology for the preparation of such dyads. The second, more demanding but also more efficient approach is based on Sonogashira coupling of ethynylphenylcorroles with suitably functionalized bromocoumarins. A broad range of structurally diverse coumarins were employed with absorption ranging from 300 to 460 nm. Spectroscopic properties of all eight dyads studied suggest that the linker components are weakly electronically coupled.

scholarly journals Solid state frustrated Lewis pair chemistry

2018 ◽  
Vol 9 (21) ◽  
pp. 4859-4865 ◽  
Author(s):  
Long Wang ◽  
Gerald Kehr ◽  
Constantin G. Daniliuc ◽  
Melanie Brinkkötter ◽  
Thomas Wiegand ◽  
...  
Keyword(s):  
Solid State ◽  
Nucleophilic Aromatic Substitution ◽  
Aromatic Substitution ◽  
Frustrated Lewis Pair

In solution the PCy3/B(C6F5)3 pair is rapidly deactivated by nucleophilic aromatic substitution. In the solid state (or in a fluorous liquid), however, it serves as an active frustrated Lewis pair to effectively split dihydrogen.

Quantum optics with nitrogen-vacancy centres in diamond

2017 ◽  
Author(s):  
Yiwen Chu ◽  
Mikhail D. Lukin
Keyword(s):  
Optical Properties ◽  
Quantum Information ◽  
Solid State ◽  
Quantum Optics ◽  
Quantum States ◽  
Nitrogen Vacancy ◽  
Common Theme ◽  
External Effects ◽  
Promising Candidate ◽  
Optical Photons

A common theme in the implementation of quantum technologies involves addressing the seemingly contradictory needs for controllability and isolation from external effects. Undesirable effects of the environment must be minimized, while at the same time techniques and tools must be developed that enable interaction with the system in a controllable and well-defined manner. This chapter addresses several aspects of this theme with regard to a particularly promising candidate for developing applications in both metrology and quantum information, namely the nitrogen-vacancy (NV) centre in diamond. The chapter describes how the quantum states of NV centres can be manipulated, probed, and efficiently coupled with optical photons. It also discusses ways of tackling the challenges of controlling the optical properties of these emitters inside a complex solid state environment.

scholarly journals Machine learning meets mechanistic modelling for accurate prediction of experimental activation energies

2021 ◽  
Author(s):  
Kjell Jorner ◽  
Tore Brinck ◽  
Per-Ola Norrby ◽  
David Buttar
Keyword(s):  
Machine Learning ◽  
Activation Energies ◽  
Accurate Prediction ◽  
Nucleophilic Aromatic Substitution ◽  
Aromatic Substitution ◽  
Mechanistic Modelling

Hybrid reactivity models, combining mechanistic calculations and machine learning with descriptors, are used to predict barriers for nucleophilic aromatic substitution.

Sign in / Sign up

Export Citation Format

Share Document