C1-Symmetric Binap Derivative Featuring Single Diferrocenylphosphino-Donor Moiety

2021 ◽  
Vol 40 (8) ◽  
pp. 1020-1024
Author(s):  
Yuuki Enomoto ◽  
Hiroki Ichiryu ◽  
Hao Hu ◽  
Yasuyuki Ura ◽  
Masamichi Ogasawara
Keyword(s):  
Donor Moiety

scholarly journals Synthesis of a Benzothiadiazole-Based D−A Molecule with Aggregation-Induced Emission and Controlled Assembly Properties

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1094
Author(s):  
Songhua Chen ◽  
Yongqi Liu ◽  
Meiyun He ◽  
Jianhua Huang
Keyword(s):  
Synergistic Effects ◽  
Preparation Methods ◽  
Solvent Vapor ◽  
Aggregation Induced Emission ◽  
Solid States ◽  
Diluted Solution ◽  
Non Covalent Interactions ◽  
Fluorescent Quantum Yield ◽  
Donor Moiety ◽  
Covalent Interactions

An electron-donating−accepting (D−A) molecule, namely, 4-(1-(4-(9H-carbazol-9-yl)phenyl)-1H-1,2,3-triazol-4-yl)benzo[c][1,2,5]thiadiazole (BT-SCC) containing carbazole as the donor moiety and benzothiadiazole as the acceptor moiety is prepared. Single-crystal X-ray structure analysis elucidated the multiple intermolecular interactions, such as hydrogen bonds, CH…π, and π…π interplays. Interestingly, the aggregation-induced emission phenomenon is observed for BT-SCC featured with enhanced fluorescent quantum yield from diluted solution of CH2Cl2 (Φ = ca. 0.1) to CH2Cl2/hexane mixed solutions or solid states (Φ = ca. 0.8). Finally, aggregates of BT-SCC are obtained through precipitating from hot and saturated solutions or solvent-vapor methods and the aggregating morphologies could be easily controlled through different preparation methods. Fabulous cube-like micro-crystals and nanospherical structures are obtained, which is established by the synergistic effects of the multiple non-covalent interactions, endowing potential utility in the field of optoelectronic devices.

Photophysical Properties of Thermally Activated Delayed Fluorescent Materials upon Distortion of Central Axis of Donor Moiety

2018 ◽  
Vol 122 (50) ◽  
pp. 28576-28587 ◽  
Author(s):  
Hyung Suk Kim ◽  
Hansol Park ◽  
So-Ra Park ◽  
Sang Hoon Lee ◽  
Yunho Ahn ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Central Axis ◽  
Thermally Activated ◽  
Fluorescent Materials ◽  
Donor Moiety

scholarly journals Unstable association in vitro between donor and recipient DNA in Bacillus subtilis

1982 ◽  
Vol 152 (1) ◽  
pp. 275-283
Author(s):  
J Van Randen ◽  
K Wiersma ◽  
G Venema
Keyword(s):  
Escherichia Coli ◽  
Bacillus Subtilis ◽  
Gradient Centrifugation ◽  
Cross Linking ◽  
Dna Fragments ◽  
Dna Complexes ◽  
Cscl Gradient ◽  
Donor Moiety

In addition to stable donor-recipient DNA complexes, unstable complexes between donor and recipient DNA were formed in vitro with Bacillus subtilis. Whereas the stable complexes survived CsCl gradient centrifugation at pH 11.2 and phenol plus sodium p-aminosalicylate extraction with 0.17 M NaCl, the unstable complexes dissociated during these manipulations. The donor moiety from the unstable complexes remained associated with the recipient DNA during phenol plus sodium p-aminosalicylate treatment at 0.85 M NaCl. The unstable complexes could be stabilized artificially by cross-linking with 4,5',8-trimethylpsoralen. Dissociation of the complexes during CsCl gradient centrifugation could be prevented by centrifuging at pH 10. Heterologous DNA fragments derived from phage H1 DNA appeared to be unable to form complexes with the recipient B. subtilis DNA. Unstable complexes were also formed with Escherichia coli DNA, although under all conditions tested, more complex was detectable by using homologous B. subtilis DNA.

Controlling the exciton lifetime of blue thermally activated delayed fluorescence emitters using a heteroatom-containing pyridoindole donor moiety

2017 ◽  
Vol 4 (4) ◽  
pp. 619-624 ◽  
Author(s):  
Gyeong Heon Kim ◽  
Raju Lampande ◽  
Joon Beom Im ◽  
Jung Min Lee ◽  
Ju Young Lee ◽  
...  
Keyword(s):  
Molecular Design ◽  
Delayed Fluorescence ◽  
Energy Splitting ◽  
Triplet Energy ◽  
High Quantum Efficiency ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Exciton Lifetime ◽  
Low Efficiency ◽  
Donor Moiety

We demonstrate a promising molecular design approach to achieve short exciton lifetime, small singlet and triplet energy splitting and high photoluminescence quantum yield in thermally activated delayed fluorescence emitters for high quantum efficiency and low efficiency roll-off characteristics in OLEDs.

Fast Reverse Intersystem Crossing Over 107 s-1 in Organic Emitters with Inverted Singlet-Triplet Gap via Intramolecular Through Space Charge Transfer

2021 ◽  
Author(s):  
Yafei Wang ◽  
Xinrui Chen ◽  
Robert Pollice ◽  
Bing Li ◽  
Yuanyuan Zhu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Space Charge ◽  
Intersystem Crossing ◽  
Acceptor Group ◽  
Fluorescent Materials ◽  
High Emission ◽  
Bond Charge ◽  
The Relationship ◽  
Donor Moiety ◽  
Insight Into

Controlling excited state properties to achieve fast reverse intersystem crossing rates of over 107 s-1 is still challenging for intramolecular through-space charge transfer (TSCT) based delayed fluorescent materials. To gain further insight into the relationship between through-space and through-bond charge transfer (TSCT/TBCT), herein, three compounds DPS-24Ac, DPS-25Ac and DPS-OAc were prepared and characterized via NMR, MS and single crystal, in which the diphenylsulfone (DPS) is used as the acceptor group and acridine (Ac) as the donor moiety. Intense emissions from blue to yellow with high emission efficiency of 70-100% are detected for all emitters. Both computations and experiments suggest that compounds DPS-24Ac and DPS-25Ac have a clear TSCT effect and also an inverted adiabatic singlet-triplet gap which can be explained by the kinetic exchange mechanism. Notably, compound DPS-24Ac achieves the highest reverse intersystem crossing rate constant (krISC) of over 107 s-1 via manipulation of both TSCT and TBCT effects. The solution-processed devices display maximum external quantum efficiencies of 21.73, 12.14 and 4.96% for DPS-24Ac, DPS-25Ac and DPS-OAc, respectively. Overall, this work provides a novel avenue to achieve highly-efficient OLED materials with fast rISC by controlling both TSCT and TBCT effects.

Theoretical investigation of second-order nonlinear optical response — Hexamolybdate as a superior donor over metal carbonyl complexes in the D–π–A model

2011 ◽  
Vol 89 (1) ◽  
pp. 61-67 ◽  
Author(s):  
Ping Song ◽  
Chunguang Liu ◽  
Wei Guan ◽  
Likai Yan ◽  
Xiaolei Sun ◽  
...  
Keyword(s):  
Density Functional ◽  
Nonlinear Optical ◽  
Metal Carbonyl ◽  
Electron Transition ◽  
Carbonyl Complexes ◽  
Metal Carbonyl Complexes ◽  
Nlo Response ◽  
Nlo Materials ◽  
Transition Channel ◽  
Donor Moiety

Density functional theory (DFT) calculations were carried out to investigate the nonlinear optical (NLO) response for the donor-conjugated bridge-accepter (D–π–A) model of p-nitroaniline (PNA) – hexamolybdate derivatives and PNA–metal–carbonyl complexes. The bond length alternation (BLA) values decrease with lengthening of the π-conjugated bridge, especially for PNA–hexamolybdate derivatives, which dramatically enhances the NLO response. In addition, the introduction of Mo≡N in PNA–hexamolybdate derivatives is expected to provide a better electron transition channel, consequently generating lower BLA values and an outstanding NLO response compared with PNA–metal–carbonyl complexes. It is shown that the hexamolybdate acts as an electron donor when incorporating metal–carbonyl complexes into one molecule. All these behaviors reflect the superiority of hexamolybdate as a donor moiety in the D–π–A model for the design of potential NLO materials.

An organic dye using N-dodecyl-3-(3,6-di-tert-butylcarbazol-N-yl)carbazol-6-yl as a donor moiety for efficient dye-sensitized solar cells

2013 ◽  
Vol 54 (36) ◽  
pp. 4903-4907 ◽  
Author(s):  
Taweesak Sudyoadsuk ◽  
Janeeya Khunchalee ◽  
Sakrawee Pansay ◽  
Pongsathorn Tongkasee ◽  
Somphob Morada ◽  
...  
Keyword(s):  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Organic Dye ◽  
Dye Sensitized ◽  
Sensitized Solar Cells ◽  
Donor Moiety

2,4-Bis[4-(dihexadecylamino)-2-hydroxyphenyl]-squaraine: Second-Harmonic Generation from Langmuir - Blodgett Monolayers of a Centro-symmetric Dye in which the Chromophores are Isolated from the Substrate

1999 ◽  
Vol 52 (1) ◽  
pp. 37 ◽  
Author(s):  
Geoffrey J. Ashwell ◽  
Patricia C. Williamson ◽  
Gurmit S. Bahra ◽  
Christopher R. Brown
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Blodgett Film ◽  
Langmuir Blodgett ◽  
Hydrophobic Barrier ◽  
Hemicyanine Dye ◽  
Donor Acceptor ◽  
The Mean ◽  
Donor Moiety

2,4-Bis[4-(dihexadecylamino)-2-hydroxyphenyl]squaraine is vertically oriented in the Langmuir–Blodgett film and the chromophore layer is separated from the glass substrate by the hydrophobic dihexadecylamino groups. The Langmuir–Blodgett monolayer exhibits moderately strong second-harmonic generation (SHG) with an effective susceptibility of c. 10 pm V-1 at 1064 nm and an intensity, relative to the mean SHG from films of the extensively studied hemicyanine dye (E)-4-[2-(4-dimethylaminophenyl)ethenyl]-N-docosylpyridinium bromide, of c. 0·3. The SHG cannot arise from the polarization of the dye by the underlying substrate because the conjugated donor-(acceptor)-donor moiety is separated by a 2 nm thick hydrophobic barrier. Instead, the non-linear optical behaviour is attributed to a non-centrosymmetric aggregate structure.

Effect of donor modification on the photo-physical and photo-voltaic properties of N-alkyl/aryl amine based chromophores

2019 ◽  
Vol 43 (23) ◽  
pp. 8970-8981 ◽  
Author(s):  
Manoj Jadhav ◽  
Jayraj V. Vaghasiya ◽  
Dinesh Patil ◽  
Saurabh S. Soni ◽  
Nagaiyan Sekar
Keyword(s):  
Acetic Acid ◽  
Conversion Efficiency ◽  
Alkyl Aryl ◽  
Emission Properties ◽  
Aryl Amine ◽  
Photo Voltaic ◽  
Electron Withdrawing Group ◽  
Donor Moiety

Six push–pull sensitizers (MD1 to MD6) having rhodanine-3-acetic acid acting as an electron withdrawing group and N-alkyl/aryl amine as a donor moiety were planned and prepared to rationalize the influence of donor alteration on absorption/emission properties and photon to current conversion efficiency (η).

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