Electrochemical recognition of alkylimidazolium-mediated ultrafast charge transfer on graphene surfaces

2018 ◽  
Vol 54 (6) ◽  
pp. 666-669
Author(s):  
Hucheng Zhang ◽  
Mengmeng Wang ◽  
Jing Zhao ◽  
Shitao Han ◽  
Haixia Cheng ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Electrochemical Method ◽  
Active Sites ◽  
High Sensitivity ◽  
Metal Free ◽  
Sensitivity And Selectivity ◽  
Donor Acceptor ◽  
Ultrafast Charge Transfer ◽  
Electrochemical Recognition

The charge transfer and active sites of metal-free imidazolium-based composites were unveiled by an electrochemical method with high sensitivity and selectivity due to the specific donor–acceptor coupling of imidazolium with NO2−.

Ultrafast Charge Transfer and Relaxation at a Donor–Acceptor Interface

2021 ◽  
Author(s):  
Fernando Rodríguez Díaz ◽  
Hong-Guang Duan ◽  
R. J. Dwayne Miller ◽  
Michael Thorwart
Keyword(s):  
Charge Transfer ◽  
Donor Acceptor ◽  
Ultrafast Charge Transfer

scholarly journals Metal-Free C-Se Cross-Coupling Enabled by Photoinduced Intermolecular Charge Transfer

2021 ◽  
Author(s):  
Chen Zhu ◽  
Serik Zhumagazy ◽  
Huifeng Yue ◽  
Magnus Rueping
Keyword(s):  
Charge Transfer ◽  
Visible Light ◽  
Electron Donor ◽  
Cross Coupling ◽  
Metal Free ◽  
Intermolecular Charge Transfer ◽  
Donor Acceptor

Metal-free C-Se cross-couplings via the formation of electron-donor-acceptor (EDA) complexes have been developed. The visible-light induced reactions can be applied for the synthesis of a series of unsymmetrical diaryl selenides...

scholarly journals Phase Equalization, Charge Transfer, Information Flows and Electron Communications in Donor–Acceptor Systems

2020 ◽  
Vol 10 (10) ◽  
pp. 3615 ◽  
Author(s):  
Roman F. Nalewajski
Keyword(s):  
Charge Transfer ◽  
Active Sites ◽  
Chemical Potential ◽  
Reactive System ◽  
Information Flows ◽  
Partial Charge Transfer ◽  
Electronic Communications ◽  
Phase Current ◽  
Reaction Complex ◽  
Donor Acceptor

Subsystem phases and electronic flows involving the acidic and basic sites of the donor (B) and acceptor (A) substrates of chemical reactions are revisited. The emphasis is placed upon the phase–current relations, a coherence of elementary probability flows in the preferred reaction complex, and on phase-equalization in the equilibrium state of the whole reactive system. The overall and partial charge-transfer (CT) phenomena in alternative coordinations are qualitatively examined and electronic communications in A—B systems are discussed. The internal polarization (P) of reactants is examined, patterns of average electronic flows are explored, and energy changes associated with P/CT displacements are identified using the chemical potential and hardness descriptors of reactants and their active sites. The nonclassical (phase/current) contributions to resultant gradient information are investigated and the preferred current-coherence in such donor–acceptor systems is predicted. It is manifested by the equalization of equilibrium local phases in the entangled subsystems.

scholarly journals A Naphthalimide-Benzothiazole Conjugate as Colorimetric and Fluorescent Sensor for Selective Trinitrophenol Detection

Chemosensors ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 38 ◽  
Author(s):  
Pramod D. Jawale Patil ◽  
Rajita D. Ingle ◽  
Sopan M. Wagalgave ◽  
Rajesh S. Bhosale ◽  
Sidhanath V. Bhosale ◽  
...  
Keyword(s):  
Color Change ◽  
Limit Of Detection ◽  
Fluorescent Sensor ◽  
Uv Light ◽  
High Sensitivity ◽  
Design And Synthesis ◽  
Bonding Interaction ◽  
Sensitivity And Selectivity ◽  
Donor Acceptor ◽  
Aromatic Nitro

Although chemical structural modification of naphthalimides is widely employed for the purpose of sensing explosives, the effects of such modification have been little explored. Herein, we report the design and synthesis of a new naphthalimide-benzothiazole conjugate (1) and its ability to sense various nitrophenols by means of its colorimetric and fluorescent characteristics. Under long-range UV light (365 nm), 1 displayed a color change of its solution from bluish to colorless only upon addition of 2,4,6-trinitrophenol (TNP). Photoluminescence spectroscopy showed quantitative fluorescence quenching by TNP of the emission peaks of 1 at 398 nm and 418 nm due to donor–acceptor electron transfer. The interaction of 1 with TNP was via a cooperative, non-covalent hydrogen-bonding interaction. Receptor 1 exhibited high sensitivity and selectivity towards TNP over various aromatic nitro analytes. The binding constant (K) and Stern–Volmer constant (Ksv) between 1 and TNP were found to be 5.332 × 10−5 M and 2.271 × 106 M−1, respectively. Furthermore, the limit of detection was calculated and found to be as low as 1.613 × 10−10 M.

scholarly journals A general design approach toward covalent organic frameworks for highly efficient electrochemiluminescence

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ya-Jie Li ◽  
Wei-Rong Cui ◽  
Qiao-Qiao Jiang ◽  
Qiong Wu ◽  
Ru-Ping Liang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
High Speed ◽  
Intramolecular Charge Transfer ◽  
High Sensitivity ◽  
Covalent Organic Frameworks ◽  
Transport Networks ◽  
Promising Direction ◽  
Highly Efficient ◽  
Donor And Acceptor ◽  
Donor Acceptor

AbstractElectrochemiluminescence (ECL) plays a key role in analysis and sensing because of its high sensitivity and low background. Its wide applications are however limited by a lack of highly tunable ECL luminophores. Here we develop a scalable method to design ECL emitters of covalent organic frameworks (COFs) in aqueous medium by simultaneously restricting the donor and acceptor to the COFs’ tight electron configurations and constructing high-speed charge transport networks through olefin linkages. This design allows efficient intramolecular charge transfer for strong ECL, and no exogenous poisonous co-reactants are needed. Olefin-linked donor-acceptor conjugated COFs, systematically synthesized by combining non-ECL active monomers with C2v or C3v symmetry, exhibit strong ECL signals, which can be boosted by increasing the chain length and conjugation of monomers. The present concept demonstrates that the highly efficient COF-based ECL luminophores can be precisely designed, providing a promising direction toward COF-based ECL phosphors.

Ultrafast charge transfer in an electron donor–acceptor complex

1994 ◽  
Vol 100 (7) ◽  
pp. 4797-4810 ◽  
Author(s):  
Klaas Wynne ◽  
C. Galli ◽  
R. M. Hochstrasser
Keyword(s):  
Charge Transfer ◽  
Electron Donor ◽  
Acceptor Complex ◽  
Donor Acceptor ◽  
Ultrafast Charge Transfer

scholarly journals Hydrogen Peroxide Detection by Super-Porous Hybrid CuO/Pt NP Platform: Improved Sensitivity and Selectivity

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 2034
Author(s):  
Rakesh Kulkarni ◽  
Sundar Kunwar ◽  
Rutuja Mandavkar ◽  
Jae-Hun Jeong ◽  
Jihoon Lee
Keyword(s):  
Hydrogen Peroxide ◽  
Physical Vapor Deposition ◽  
Active Sites ◽  
Limit Of Detection ◽  
Synergetic Effect ◽  
High Sensitivity ◽  
Detection Range ◽  
Hydrogen Peroxide Detection ◽  
Sensitivity And Selectivity ◽  
Hybrid Platform

A super-porous hybrid platform can offer significantly increased number of reaction sites for the analytes and thus can offer advantages in the biosensor applications. In this work, a significantly improved sensitivity and selectivity of hydrogen peroxide (H2O2) detection is demonstrated by a super-porous hybrid CuO/Pt nanoparticle (NP) platform on Si substrate as the first demonstration. The super-porous hybrid platform is fabricated by a physiochemical approach combining the physical vapor deposition of Pt NPs and electrochemical deposition of super-porous CuO structures by adopting a dynamic hydrogen bubble technique. Under an optimized condition, the hybrid CuO/Pt biosensor demonstrates a very high sensitivity of 2205 µA/mM·cm2 and a low limit of detection (LOD) of 140 nM with a wide detection range of H2O2. This is meaningfully improved performance as compared to the previously reported CuO-based H2O2 sensors as well as to the other metal oxide-based H2O2 sensors. The hybrid CuO/Pt platform exhibits an excellent selectivity against other interfering molecules such as glucose, fructose, dopamine, sodium chloride and ascorbic acid. Due to the synergetic effect of highly porous CuO structures and underlying Pt NPs, the CuO/Pt architecture offers extremely abundant active sites for the H2O2 reduction and electron transfer pathways.

scholarly journals A DFT analysis of the ground and charge-transfer excited states of Sc3N@Ih–C80 fullerene coupled with metal-free and zinc-phthalocyanine

2018 ◽  
Vol 20 (40) ◽  
pp. 25841-25848 ◽  
Author(s):  
Fatemeh Amerikheirabadi ◽  
Carlos Diaz ◽  
Neetha Mohan ◽  
Rajendra R. Zope ◽  
Tunna Baruah
Keyword(s):  
Charge Transfer ◽  
Dft Calculations ◽  
Excited States ◽  
Zinc Phthalocyanine ◽  
Metal Free ◽  
Donor Acceptor

Ground and charge transfer excited states of two co-facial donor–acceptor conjugates formed by noncovalent coupling of Sc3N@–C80 with H2Pc and ZnPc chromophores are investigated using DFT calculations.

scholarly journals Research on Long-Lived Room-Temperature Phosphorescence of Carbazole-Naphthalimide Polylactides

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 790
Author(s):  
Zhiwei Li ◽  
Xingyuan Zhang
Keyword(s):  
Charge Transfer ◽  
Electrochemical Method ◽  
Room Temperature ◽  
Potential Candidate ◽  
Room Temperature Phosphorescence ◽  
Phosphorescence Lifetime ◽  
Donor Acceptor ◽  
Phosphorescence Emission ◽  
Carbazole Group

Two types of naphthalimide derivatives were synthesized by introducing a carbazole group and an n-butyl, respectively, into the naphthalimide system. The electron-donating ability of two kinds of derivatives was investigated by the electrochemical method. These two types of derivatives were used as initiators for the polymerization of d and l-lactide polymerization. Here, the emission and UV-vis absorption serve as the main focus. Compared with solely donor-initiated polylactide (PLA), the PLA with a donor-acceptor structure has a more efficient phosphorescence emission, of which the longest phosphorescence lifetime is up to 407 ms. The experimental results reveal the existence of charge-transfer states in the donor-acceptor-ended polymer. Due to the role of charge-transfer states, a red phosphorescent polymer was developed. Theoretically, these desirable advantages render synthesized PLAs a potential candidate for bioimaging and anti-counterfeiting.

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