Ground-State Kinetics of Bistable Redox-Active Donor–Acceptor Mechanically Interlocked Molecules

2013 ◽  
Vol 47 (2) ◽  
pp. 482-493 ◽  
Author(s):  
Albert C. Fahrenbach ◽  
Carson J. Bruns ◽  
Hao Li ◽  
Ali Trabolsi ◽  
Ali Coskun ◽  
...  
Keyword(s):  
Ground State ◽  
Interlocked Molecules ◽  
Redox Active ◽  
Donor Acceptor ◽  
Kinetics Of ◽  
Active Donor

Ground-State Thermodynamics of Bistable Redox-Active Donor–Acceptor Mechanically Interlocked Molecules

2012 ◽  
Vol 45 (9) ◽  
pp. 1581-1592 ◽  
Author(s):  
Albert C. Fahrenbach ◽  
Carson J. Bruns ◽  
Dennis Cao ◽  
J. Fraser Stoddart
Keyword(s):  
Ground State ◽  
Interlocked Molecules ◽  
Redox Active ◽  
Donor Acceptor ◽  
Active Donor

scholarly journals Preparation and characterization of 3-(4,5-ethylenedithio-1,3-dithiol-2-ylidene)naphthopyranone: a luminescent redox-active donor–acceptor compound

Tetrahedron ◽  
2006 ◽  
Vol 62 (48) ◽  
pp. 11106-11111 ◽  
Author(s):  
Stefan Dolder ◽  
Shi-Xia Liu ◽  
Xavier Guégano ◽  
Mihail Atanasov ◽  
Claude A. Daul ◽  
...  
Keyword(s):  
Redox Active ◽  
Donor Acceptor ◽  
Active Donor

UV to NIR multistate electrochromism and electrofluorochromism in dibenzophenazine-arylamine derivatives

2021 ◽  
Author(s):  
Bahadur Sk ◽  
Madhurima Sarkar ◽  
Kuldeep Singh ◽  
Arunava Sengupta ◽  
Abhijit Patra
Keyword(s):  
Charge Transfer ◽  
Redox Active ◽  
Intervalence Charge Transfer ◽  
Donor Acceptor ◽  
Active Donor ◽  
Tunable Absorption

An intriguing case of intramolecular and intervalence charge transfer-driven multistate electrochromism and electrofluorochromism in dibenzophenazin-(phenyl)methanone and arylamine-based redox-active donor-acceptor-donor molecules was elucidated. Tunable absorption from UV to NIR and on-off...

Synthesis of redox-active donor/acceptor chromophores with a central indenofluorene or indacenodithiophene core

2020 ◽  
Vol 61 (23) ◽  
pp. 151939
Author(s):  
Dianna Andersen ◽  
David Bo Nygaard ◽  
Rasmus Refsgaard Kragh ◽  
Line Broløs ◽  
Mogens Brøndsted Nielsen
Keyword(s):  
Redox Active ◽  
Donor Acceptor ◽  
Active Donor

Solvent-dependent ground-state distributions in a donor-acceptor redox-active bistable [2]catenane

2012 ◽  
Vol 25 (7) ◽  
pp. 544-552 ◽  
Author(s):  
Cheng Wang ◽  
Dennis Cao ◽  
Albert C. Fahrenbach ◽  
Lei Fang ◽  
Mark A. Olson ◽  
...  
Keyword(s):  
Ground State ◽  
Redox Active ◽  
Donor Acceptor

Energetic Control of Redox-Active Polymers Towards Safe Organic Bioelectronic Materials

2019 ◽  
Author(s):  
Alexander Giovannitti ◽  
Reem B. Rashid ◽  
Quentin Thiburce ◽  
Bryan D. Paulsen ◽  
Camila Cendra ◽  
...  
Keyword(s):  
Molecular Oxygen ◽  
Organic Semiconductors ◽  
Side Reaction ◽  
Semiconducting Polymers ◽  
Side Reactions ◽  
Redox Active ◽  
Donor Acceptor ◽  
Electrochemical Devices ◽  
Biological Environment ◽  
Device Operation

<p>Avoiding faradaic side reactions during the operation of electrochemical devices is important to enhance the device stability, to achieve low power consumption, and to prevent the formation of reactive side‑products. This is particularly important for bioelectronic devices which are designed to operate in biological systems. While redox‑active materials based on conducting and semiconducting polymers represent an exciting class of materials for bioelectronic devices, they are susceptible to electrochemical side‑reactions with molecular oxygen during device operation. We show that this electrochemical side reaction yields hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>), a reactive side‑product, which may be harmful to the local biological environment and may also accelerate device degradation. We report a design strategy for the development of redox-active organic semiconductors based on donor-acceptor copolymers that prevent the formation of H<sub>2</sub>O<sub>2</sub> during device operation. This study elucidates the previously overlooked side-reactions between redox-active conjugated polymers and molecular oxygen in electrochemical devices for bioelectronics, which is critical for the operation of electrolyte‑gated devices in application-relevant environments.</p>

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.

scholarly journals Photosystem II: Thermodynamics and Kinetics of Electron Transport from QA- to QB(QB- ) and Deleterious Effects of Copper(II)

1993 ◽  
Vol 48 (3-4) ◽  
pp. 234-240 ◽  
Author(s):  
G. Renger ◽  
H. M. Gleiter ◽  
E. Haag ◽  
F. Reifarth
Keyword(s):  
Oxygen Evolution ◽  
Manganese Content ◽  
Fluorescence Emission ◽  
Laser Flash ◽  
Fluorescence Induction ◽  
Oxygen Evolving Complex ◽  
Ps Ii ◽  
Thermodynamics And Kinetics ◽  
Redox Active ◽  
Kinetics Of

Studies on thermodynamics and kinetics of electron transfer from QA- to QB(QB-) were performed by monitoring laser flash induced changes of the relative fluorescence emission as a function of temperature (220 K < T < 310 K) in isolated thylakoids and PS II membrane fragments.In addition, effects of bivalent metal ions on PS II were investigated by measuring conventional fluorescence induction curves, oxygen evolution, manganese content and atrazine binding mostly in PS II membrane fragments. It was found: a) the normalized level of the fluorescence remaining 10 s after the actinic flash (Ft/F0) steeply increases at temperatures below -10 to - 20 °C, b) the fast phase of the transient fluorescence change becomes markedly retarded with decreasing temperatures, c) among different cations (Cu2+, Zn2+, Cd2+, Ni2+, Co2+) only Cu2+ exhibits marked effects in the concentration range below 100 μᴍ and d) Cu2+ decreases the normalized variable fluorescence, inhibits oxygen evolution and diminishes the affinity to atrazine binding without affecting the number of binding sites. The content of about four manganeses per functionally competent oxygen evolving complex is not changed by [Cu2+] < 70 μᴍ.Based on these findings it is concluded: i) a temperature dependent equilibrium between an inactive (I) and active (A) state of QA- reoxidation by QB(QB- ) is characterized by standard enthalpies ΔH° of 95 kJ mol-1 and 60 kJ mol-1 and standard entropies ΔS° of 370 kJ K-1 mol-1 and 240 kJ K-1 mol-1 in isolated thylakoids and PS II membrane fragments, respectively, ii) the activation energies of QA- reoxidation by plastoquinone bound to the QB site are about 30 kJ mol-1 (thylakoids) and 40 kJ mol-1 (PS II membrane fragments) in 220 K < T < 300 K, and iii) Cu2+ causes at least a two-fold effect on PS II by modifying the atrazine binding affinity at lower concentrations ( ~ 5 μᴍ) and interference with the redox active tyrosine Yz at slightly higher concentration ( ~ 10 μᴍ) leading to blockage of oxygen evolution.

Sign in / Sign up

Export Citation Format

Share Document