Electronic and Photophysical Properties of 9,10‐Anthrylene‐Bridged B‐π‐N Donor‐Acceptor Molecules with Solid‐State Emission in the Yellow to Red Region

ChemPlusChem ◽  
2019 ◽  
Vol 84 (9) ◽  
pp. 1305-1313 ◽  
Author(s):  
Masashi Uebe ◽  
Daisuke Sakamaki ◽  
Akihiro Ito
Keyword(s):  
Solid State ◽  
Photophysical Properties ◽  
Donor Acceptor ◽  
Acceptor Molecules

Photoresponsive triazole-based donor–acceptor molecules: color change and heat/air-stable diradicals

2019 ◽  
Vol 7 (10) ◽  
pp. 3100-3104 ◽  
Author(s):  
Ning-Ning Zhang ◽  
Rong-Jian Sa ◽  
Shan-Shan Sun ◽  
Ming-De Li ◽  
Ming-Sheng Wang ◽  
...  
Keyword(s):  
Solid State ◽  
Charge Separation ◽  
Color Change ◽  
Heat Stable ◽  
Donor Acceptor ◽  
Acceptor Molecules

An unprecedented series of triazole-based donor–acceptor molecules were found to form highly air/heat-stable triplet diradicals in the solid state accompanied by a color change after photoinduced intramolecular charge separation.

scholarly journals Emission solvatochromic, solid-state and aggregation-induced emissive α-pyrones and emission-tuneable 1H-pyridines by Michael addition–cyclocondensation sequences

2019 ◽  
Vol 15 ◽  
pp. 2684-2703 ◽  
Author(s):  
Natascha Breuer ◽  
Irina Gruber ◽  
Christoph Janiak ◽  
Thomas J J Müller
Keyword(s):  
Solid State ◽  
Michael Addition ◽  
Photophysical Properties ◽  
Ethyl Cyanoacetate ◽  
Product Formation ◽  
Quantum Yields ◽  
Substitution Pattern ◽  
Fluorescence Quantum Yields ◽  
Emission Enhancement ◽  
Donor Acceptor

Starting from substituted alkynones, α-pyrones and/or 1H-pyridines were generated in a Michael addition–cyclocondensation with ethyl cyanoacetate. The peculiar product formation depends on the reaction conditions as well as on the electronic substitution pattern of the alkynone. While electron-donating groups furnish α-pyrones as main products, electron-withdrawing groups predominantly give the corresponding 1H-pyridines. Both heterocycle classes fluoresce in solution and in the solid state. In particular, dimethylamino-substituted α-pyrones, as donor–acceptor systems, display remarkable photophysical properties, such as strongly red-shifted absorption and emission maxima with daylight fluorescence and fluorescence quantum yields up to 99% in solution and around 11% in the solid state, as well as pronounced emission solvatochromism. Also a donor-substituted α-pyrone shows pronounced aggregation-induced emission enhancement.

scholarly journals Effects of Substituents on the Blue Luminescence of Disilane-Linked Donor‒Acceptor‒Donor Triads

Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 521 ◽  
Author(s):  
Tsukasa Usuki ◽  
Kenichiro Omoto ◽  
Masaki Shimada ◽  
Yoshinori Yamanoi ◽  
Hidetaka Kasai ◽  
...  
Keyword(s):  
Solid State ◽  
Density Functional ◽  
Photophysical Properties ◽  
Density Functional Theory Calculations ◽  
Molecular Structures ◽  
Optical Measurements ◽  
X Ray Diffraction ◽  
Absolute Quantum Yield ◽  
Donor Acceptor ◽  
Metal Catalyzed

A series of disilane-linked donor‒acceptor‒donor triads (D‒Si‒Si‒A‒Si‒Si‒D) was synthesized to investigate the effects of substituents on the photophysical properties. The triads were prepared by metal-catalyzed diiodosilylation of aryl iodides using a Pd(P(t-Bu)3)2/(i-Pr)2EtN/toluene system that we previously developed. Optical measurements, X-ray diffraction analysis, and density functional theory calculations revealed relationships between the photophysical properties and molecular structures of these triads in solution and in the solid state. The compounds emitted blue to green fluorescence in CH2Cl2 solution and in the solid state. Notably, compound 2 showed fluorescence with an absolute quantum yield of 0.17 in the solid state but showed no fluorescence in CH2Cl2. Our findings confirmed that the substituent adjacent to the disilane moiety affects the conformations and emission efficiencies of compounds in solution and in the solid state.

Tuning the Photophysical Properties of 2-Quinolinone-Based Donor-Acceptor Molecules throughN- versusO-Alkylation: Insights from Experimental and Theoretical Investigations

2013 ◽  
Vol 2014 (4) ◽  
pp. 753-766 ◽  
Author(s):  
Ganesan Paramaguru ◽  
Rajadurai Vijay Solomon ◽  
Sivanadanam Jagadeeswari ◽  
Ponnambalam Venuvanalingam ◽  
Rajalingam Renganathan
Keyword(s):  
Photophysical Properties ◽  
Theoretical Investigations ◽  
Donor Acceptor ◽  
Acceptor Molecules

scholarly journals Fast Delayed Emission in New Pyridazine-Based Compounds

2021 ◽  
Vol 8 ◽  
Author(s):  
Simonas Krotkus ◽  
Tomas Matulaitis ◽  
Stefan Diesing ◽  
Graeme Copley ◽  
Emily Archer ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Delayed Fluorescence ◽  
Intersystem Crossing ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Emission Lifetime ◽  
Donor Acceptor ◽  
Acceptor Moiety ◽  
Triplet Harvesting ◽  
Acceptor Molecules

Three novel donor-acceptor molecules comprising the underexplored pyridazine (Pydz) acceptor moiety have been synthesized and their structural, electrochemical and photophysical properties thoroughly characterized. Combining Pydz with two phenoxazine donor units linked via a phenyl bridge in a meta configuration (dPXZMePydz) leads to high reverse intersystem crossing rate kRISC = 3.9 · 106 s−1 and fast thermally activated delayed fluorescence (TADF) with <500 ns delayed emission lifetime. Efficient triplet harvesting via the TADF mechanism is demonstrated in OLEDs using dPXZMePydz as the emitter but does not occur for compounds bearing weaker donor units.

Carbazole-modified thiazolo[3,2-c][1,3,5,2]oxadiazaborinines exhibiting aggregation-induced emission and mechanofluorochromism

2021 ◽  
Author(s):  
Mykhaylo A. Potopnyk ◽  
Mykola Kravets ◽  
Roman Luboradzki ◽  
Dmytro Volyniuk ◽  
Volodymyr Sashuk ◽  
...  
Keyword(s):  
Solid State ◽  
Fluorescence Properties ◽  
Aggregation Induced Emission ◽  
Donor Acceptor ◽  
Solid State Fluorescence ◽  
Active Donor

Two novel AIE-active donor–acceptor organoboron complexes with a carbazole donor unit are developed and their morphology-dependent solid-state fluorescence properties are established.

Synthesis, photophysical properties, and computational studies of benzothiadiazole and/or phenothiazine based donor/acceptor π-conjugated copolymers

2021 ◽  
Vol 28 (7) ◽  
Author(s):  
Ashraf A. El-Shehawy ◽  
Morad M. El-Hendawy ◽  
Adel M. Attia ◽  
Abdul-Rahman I. A. Abdallah ◽  
Nabiha I. Abdo
Keyword(s):  
Photophysical Properties ◽  
Computational Studies ◽  
Donor Acceptor ◽  
Conjugated Copolymers
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