scholarly journals Three Redox States of a Diradical Acceptor–Donor–Acceptor Triad: Gating the Magnetic Coupling and the Electron Delocalization

2016 ◽  
Vol 7 (12) ◽  
pp. 2234-2239 ◽  
Author(s):  
Manuel Souto ◽  
Vega Lloveras ◽  
Sergi Vela ◽  
Maria Fumanal ◽  
Imma Ratera ◽  
...  
Keyword(s):  
Magnetic Coupling ◽  
Electron Delocalization ◽  
Redox States ◽  
Donor Acceptor

scholarly journals Spectroscopic Insights into the Oxygen-tolerant Membrane-associated [NiFe] Hydrogenase of Ralstonia eutropha H16

2009 ◽  
Vol 284 (24) ◽  
pp. 16264-16276 ◽  
Author(s):  
Miguel Saggu ◽  
Ingo Zebger ◽  
Marcus Ludwig ◽  
Oliver Lenz ◽  
Bärbel Friedrich ◽  
...  
Keyword(s):  
Active Site ◽  
Ralstonia Eutropha ◽  
Large Subunit ◽  
Magnetic Coupling ◽  
Spectroscopic Characterization ◽  
Spectroscopic Properties ◽  
Small Subunit ◽  
Reduced Form ◽  
Strictly Anaerobic ◽  
Redox States

This study provides the first spectroscopic characterization of the membrane-bound oxygen-tolerant [NiFe] hydrogenase (MBH) from Ralstonia eutropha H16 in its natural environment, the cytoplasmic membrane. The H2-converting MBH is composed of a large subunit, harboring the [NiFe] active site, and a small subunit, capable in coordinating one [3Fe4S] and two [4Fe4S] clusters. The hydrogenase dimer is electronically connected to a membrane-integral cytochrome b. EPR and Fourier transform infrared spectroscopy revealed a strong similarity of the MBH active site with known [NiFe] centers from strictly anaerobic hydrogenases. Most redox states characteristic for anaerobic [NiFe] hydrogenases were identified except for one remarkable difference. The formation of the oxygen-inhibited Niu-A state was never observed. Furthermore, EPR data showed the presence of an additional paramagnetic center at high redox potential (+290 mV), which couples magnetically to the [3Fe4S] center and indicates a structural and/or redox modification at or near the proximal [4Fe4S] cluster. Additionally, significant differences regarding the magnetic coupling between the Nia-C state and [4Fe4S] clusters were observed in the reduced form of the MBH. The spectroscopic properties are discussed with regard to the unusual oxygen tolerance of this hydrogenase and in comparison with those of the solubilized, dimeric form of the MBH.

Multiple Redox States and Multielectrochromism of Donor–Acceptor Conjugated Polymers with Aromatic Diimide Pendant Groups

2019 ◽  
Vol 52 (21) ◽  
pp. 8453-8465 ◽  
Author(s):  
Anna Drewniak ◽  
Mateusz D. Tomczyk ◽  
Karol Knop ◽  
Krzysztof Z. Walczak ◽  
Przemyslaw Ledwon
Keyword(s):  
Conjugated Polymers ◽  
Redox States ◽  
Donor Acceptor

Models for Magnetic Coupling in Metallocene Based Donor/Acceptor Complexes

1991 ◽  
pp. 171-190 ◽  
Author(s):  
David A. Dixon ◽  
Andris Suna ◽  
Joel S. Miller ◽  
Arthur J. Epstein
Keyword(s):  
Magnetic Coupling ◽  
Donor Acceptor

Does Electron Delocalization Influence Charge Separation at Donor–Acceptor Interfaces in Organic Photovoltaic Cells?

2018 ◽  
Vol 122 (38) ◽  
pp. 21792-21802 ◽  
Author(s):  
Frank-Julian Kahle ◽  
Christina Saller ◽  
Selina Olthof ◽  
Cheng Li ◽  
Jenny Lebert ◽  
...  
Keyword(s):  
Charge Separation ◽  
Photovoltaic Cells ◽  
Organic Photovoltaic ◽  
Electron Delocalization ◽  
Organic Photovoltaic Cells ◽  
Donor Acceptor

scholarly journals New donor–acceptor conjugates based on a trifluorenylporphyrin linked to a redox–switchable ruthenium unit

2015 ◽  
Vol 44 (20) ◽  
pp. 9470-9485 ◽  
Author(s):  
Areej Merhi ◽  
Xu Zhang ◽  
Dandan Yao ◽  
Samuel Drouet ◽  
Olivier Mongin ◽  
...  
Keyword(s):  
Oxidation Process ◽  
Redox States ◽  
Reduction Processes ◽  
Donor Acceptor

Spectroelectrochemical studies show four accessible redox states on dyad 3 with the first oxidation process taking place at the Ru(ii) centre and the second oxidation and first reduction processes at the porphyrin centre.

scholarly journals Redox tunable viologen-based porous organic polymers

2016 ◽  
Vol 4 (13) ◽  
pp. 2535-2544 ◽  
Author(s):  
Carol Hua ◽  
Bun Chan ◽  
Aditya Rawal ◽  
Floriana Tuna ◽  
David Collison ◽  
...  
Keyword(s):  
Organic Polymers ◽  
Porous Organic Polymers ◽  
Redox States ◽  
Donor Acceptor

The interplay between the electronic, spectral and host–guest properties of a donor–acceptor polymer in its different redox states is demonstrated.

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