Revealing Internal Heavy Chalcogen Atom Effect on the Photophysics of Dibenzo[a,j]phenazine-Cored Donor–Acceptor–Donor Triad

2021 ◽  
Author(s):  
Shimpei Goto ◽  
Yuya Nitta ◽  
Nicolas Oliveira Decarli ◽  
Leonardo E de Sousa ◽  
Partycja Stachelek ◽  
...  
Keyword(s):  
Electron Acceptor ◽  
Organic Molecule ◽  
Electron Donors ◽  
Chalcogen Atom ◽  
Donor Acceptor ◽  
Atom Effect

A new twisted donor–acceptor–donor (D–A–D) multi-photofunctional organic molecule comprising of phenoselenazine as the electron-donors (Ds) and dibenzo[a,j]phenazine (DBPHZ) as the electron-acceptor (A) has been developed. The developed selenium-incorporated D–A–D compound...

Donor-acceptor based two-dimensional covalent organic frameworks for near-infrared photothermal conversion

2021 ◽  
Author(s):  
Yue Zhang ◽  
Gui-Yuan Wu ◽  
Hui Liu ◽  
Rui Tian ◽  
Yan Li ◽  
...  
Keyword(s):  
Electron Acceptor ◽  
Near Infrared ◽  
Electron Donors ◽  
Two Dimensional ◽  
Covalent Organic Frameworks ◽  
Photothermal Conversion ◽  
Donor Acceptor ◽  
Naphthalene Diimides

Two 2D COFs containing both naphthalene diimides (NDIs) as an electron acceptor (A) and triphenylamine (PT-N-COF) or triphenylbenzene (PT-B-COF) as electron donors (D) were prepared successfully. The in-plane donor and...

Die Bedeutung von Donor-Acceptor-Wechselwirkungen im äußeren Schweratom-Effekt von AgNO3 auf das Lumineszenzverhalten von Aza-aromaten und Carbazolen / The Significance of Donor-Acceptor Interactions in the External Heavy Atom Effect of AgNO3 on the Luminescence Behaviour of Aza-aromatic Systems and Carbazoles

1978 ◽  
Vol 33 (8) ◽  
pp. 998-1000 ◽  
Author(s):  
M. Zander
Keyword(s):  
Aromatic Hydrocarbons ◽  
Transition Probabilities ◽  
Heavy Atom ◽  
Fluorescence Analysis ◽  
Electronic System ◽  
Electron Donors ◽  
Strong Electron ◽  
Donor Acceptor ◽  
Aromatic Systems ◽  
Atom Effect

The transition probabilities of spin-forbidden processes become much more enhanced in the case of aza-aromatic systems than for structurally related aromatic hydrocarbons when AgNO3 is used as an external heavy atom perturber. This is explained with the strong electron donor properties of aza-aromatic systems thus causing strong interaction between the π-electronic system and the perturber. Since carbazoles are weaker electron donors than aza-aromatic systems, the enhancement of the phosphorescence/fluorescence quantum yield ratio by AgNO3 is lower than for aza-aromatic systems. The different behaviour of aza-aromatic systems and aromatic hydrocarbons in the heavy atom experiment with AgNO3 can find applications in fluorescence analysis.

Tuning memory performances from WORM to flash or DRAM by structural tailoring with different donor moieties

2014 ◽  
Vol 2 (36) ◽  
pp. 7674-7680 ◽  
Author(s):  
Feng Zhou ◽  
Jing-Hui He ◽  
Quan Liu ◽  
Pei-Yang Gu ◽  
Hua Li ◽  
...  
Keyword(s):  
Active Layer ◽  
Electron Acceptor ◽  
Nonvolatile Memory ◽  
Organic Molecules ◽  
Electron Donors ◽  
Memory Devices ◽  
Nonvolatile Memory Devices ◽  
Donor Acceptor

Four donor–acceptor organic molecules (HATT, HDTT, HETT and HRTT) consisting of different electron donors (phenol, triphenylamine, benzene and carbazole) and the same electron acceptor (triazole) were used as the active layer in NVM (nonvolatile memory) devices.

Microbial Perchlorate Reduction in Groundwater with Different Electron Donors

2013 ◽  
Vol 295-298 ◽  
pp. 1402-1407
Author(s):  
Rui Wang ◽  
Ming Chen ◽  
Jia Wen Zhang ◽  
Fei Liu ◽  
Hong Han Chen
Keyword(s):  
Removal Efficiency ◽  
Electron Donor ◽  
Electron Acceptor ◽  
Reduction Rate ◽  
Electron Donors ◽  
Monod Equation ◽  
Hydrogen Addition ◽  
Perchlorate Reduction ◽  
Perchlorate Removal

Effects of different electron donors (acetate and hydrogen), acetate and perchlorate concentrations on microbial perchlorate reduction in groundwater were studied. The results showed that acetate and hydrogen addition as an electron donor can significantly improve perchlorate removal efficiency while a longer period was observed for hydrogen (15 d) than for acetate (8 d). The optical ratio of electron donor (acetate)-to-electron acceptor (perchlorate) was approximately 1.65 mg COD mg perchlorate-1. The highest specific reduction rate of perchlorate was achieved at the acetate-to-perchlorate ratio of 3.80 mg COD mg perchlorate-1. The perchlorate reduction rates corresponded well to the theoretical values calculated by the Monod equation and the parameters of Ks and Vm were determined to be 15.6 mg L-1 and 0.26 d-1, respectively.

Syntheses and Photovoltaic Properties of Narrow Band Gap Donor–Acceptor Copolymers with Carboxylate-Substituted Benzodithiophene as Electron Acceptor Unit

2014 ◽  
Vol 47 (15) ◽  
pp. 4987-4993 ◽  
Author(s):  
Kosuke Shibasaki ◽  
Kenichi Tabata ◽  
Yohei Yamamoto ◽  
Takeshi Yasuda ◽  
Masashi Kijima
Keyword(s):  
Band Gap ◽  
Electron Acceptor ◽  
Narrow Band ◽  
Photovoltaic Properties ◽  
Donor Acceptor

CHARGE TRANSPORT THROUGH CARBON NANOTUBE OR FULLERENE–MOLECULE–SILICON JUNCTIONS

NANO ◽  
2007 ◽  
Vol 02 (05) ◽  
pp. 285-294
Author(s):  
FU-REN F. FAN ◽  
BO CHEN ◽  
AUSTEN K. FLATT ◽  
JAMES M. TOUR ◽  
ALLEN J. BARD
Keyword(s):  
Carbon Nanotube ◽  
Charge Transport ◽  
Electron Acceptor ◽  
Negative Differential Resistance ◽  
Fullerene Molecule ◽  
Differential Resistance ◽  
Electron Donors ◽  
Switching Behavior ◽  
Current Voltage ◽  
Bistable Switching

We report here the current–voltage (i–V) characteristics of several (n++- Si /MNOPE/ C 60/ Pt -tip) or (n++- Si /MNOPE/SWCNT/ Pt -tip) junctions, where MNOPE = 2'-mononitro-4, 4'-bis(phenylethynyl)-1-phenylenediazonium and SWCNT = single wall carbon nanotube. A layer of C 60 or SWCNT-derivatized MNOPE has strong effect on the i–V behavior of the junctions, including rectification, negative differential resistance (NDR) and switching behaviors. The i–V curve of a grafted molecular monolayer (GMM) of MNOPE atop n++- Si shows NDR behavior, whereas those of C 60- and SWCNT-derivatized GMMs of MNOPE on n++- Si show strong rectifying behavior with opposite rectification polarities. With C 60, larger currents were found with negative tip bias, while with SWCNT, the forward top bias was positive. Because C 60 tends to be a good electron acceptor and SWCNTs tend to be good electron donors, they show different i–V behavior, as observed. Some of the (n++- Si /MNOPE/SWCNT/ Pt -tip) junctions also show reversible bistable switching behavior.

scholarly journals Dopamine antagonists for the treatment of drug addiction: PF-4363467 and related compounds

2020 ◽  
Vol 11 (1) ◽  
pp. 84-90 ◽  
Author(s):  
Ana Martinez
Keyword(s):  
Drug Addiction ◽  
Main Idea ◽  
Electron Donors ◽  
Health Concern ◽  
Dopamine Antagonists ◽  
Donor Acceptor ◽  
Homo And Lumo ◽  
Related Compounds ◽  
Receptor Agonists And Antagonists

Drug addiction refers to an out-of-control and compulsive use of substances, which can reach epidemic magnitudes. It is a health concern throughout the world and has major economic impact. Dopamine receptor agonists and antagonists have been cited as molecular targets for the treatment of drug addiction. In this report, the main idea is to analyze the new D3R/D2R ligands that are proposed for the treatment of drug abuse, in terms of their electron donor/acceptor properties. Substances catalogued as agonists represent good electron donors, whereas antagonists represent good electron acceptors. HOMO and LUMO eigenvalues indicate that more energy is necessary to remove an electron from the antagonists, and likewise more energy is gained when antagonists accept an electron. The combination of two molecules (PF-592379 and PNU-177864) produces a new compound (PF-4363467) with properties that are intermediate. Irrespective of the characteristics of the receptor, the classification of ligands is important, in order to further understanding of the reaction mechanism of these compounds. This may help in the design of new molecules for the treatment of drug addiction.

P-doped graphene-C60 nanocomposite: A donor–acceptor complex with a P-C dative bond

2022 ◽  
Author(s):  
Rabindranath Lo ◽  
Debashree Manna ◽  
Pavel Hobza
Keyword(s):  
Electron Acceptor ◽  
The Other ◽  
Acceptor Complex ◽  
Dative Bond ◽  
Other Hand ◽  
Doped Graphene ◽  
Donor Acceptor

Phosphorous-doped graphene can form a covalent dative bond with the electron acceptor, C60 molecule. On the other hand, C60 on graphene and N-doped graphene surfaces can only form vdW complexes....

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