Solvent Control of Ligand-Metal Electron Transfer in Mononuclear Copper Complexes with Redox-Active Bisguanidine Ligands

2018 ◽  
Vol 2018 (32) ◽  
pp. 3660-3667 ◽  
Author(s):  
David F. Schrempp ◽  
Elisabeth Kaifer ◽  
Hans-Jörg Himmel
Keyword(s):  
Electron Transfer ◽  
Copper Complexes ◽  
Redox Active ◽  
Solvent Control ◽  
Metal Electron

scholarly journals Copper catalysis with redox-active ligands

2020 ◽  
Vol 16 ◽  
pp. 858-870 ◽  
Author(s):  
Agnideep Das ◽  
Yufeng Ren ◽  
Cheriehan Hessin ◽  
Marine Desage-El Murr
Keyword(s):  
Electron Transfer ◽  
Coordination Sphere ◽  
Copper Complexes ◽  
Heterocyclic Carbenes ◽  
Metal Center ◽  
Copper Catalysis ◽  
Redox Active Ligands ◽  
Elementary Steps ◽  
Cooperative Catalysis ◽  
Redox Active

Copper catalysis finds applications in various synthetic fields by utilizing the ability of copper to sustain mono- and bielectronic elementary steps. Further to the development of well-defined copper complexes with classical ligands such as phosphines and N-heterocyclic carbenes, a new and fast-expanding area of research is exploring the possibility of a complementing metal-centered reactivity with electronic participation by the coordination sphere. To achieve this electronic flexibility, redox-active ligands can be used to engage in a fruitful “electronic dialogue” with the metal center, and provide additional venues for electron transfer. This review aims to present the latest results in the area of copper-based cooperative catalysis with redox-active ligands.

Inter- and Intramolecular Electron Transfer in Copper Complexes: Electronic Entatic State with Redox-Active Guanidine Ligands

2017 ◽  
Vol 23 (55) ◽  
pp. 13607-13611 ◽  
Author(s):  
David F. Schrempp ◽  
Simone Leingang ◽  
Martin Schnurr ◽  
Elisabeth Kaifer ◽  
Hubert Wadepohl ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Copper Complexes ◽  
Intramolecular Electron Transfer ◽  
Entatic State ◽  
Redox Active

scholarly journals Insight to Microbial Fe(III) Reduction Mediated by Redox-Active Humic Acids with Varied Redox Potentials

2021 ◽  
Vol 18 (13) ◽  
pp. 6807
Author(s):  
Jingtao Duan ◽  
Zhiyuan Xu ◽  
Zhen Yang ◽  
Jie Jiang
Keyword(s):  
Molecular Weight ◽  
Electron Transfer ◽  
Humic Acids ◽  
Weight Fraction ◽  
Electrochemical Analysis ◽  
Microbial Reduction ◽  
Redox Potentials ◽  
Groundwater Environment ◽  
Redox Active ◽  
Different Molecular Weight

Redox-active humic acids (HA) are ubiquitous in terrestrial and aquatic systems and are involved in numerous electron transfer reactions affecting biogeochemical processes and fates of pollutants in soil environments. Redox-active contaminants are trapped in soil micropores (<2 nm) that have limited access to microbes and HA. Therefore, the contaminants whose molecular structure and properties are not damaged accumulate in the soil micropores and become potential pollution sources. Electron transfer capacities (ETC) of HA reflecting redox activities of low molecular weight fraction (LMWF, <2.5) HA can be detected by an electrochemical method, which is related to redox potentials (Eh) in soil and aquatic environments. Nevertheless, electron accepting capacities (EAC) and electron donating capacities (EDC) of these LMWF HA at different Eh are still unknown. EDC and EAC of different molecular weight HA at different Eh were analyzed using electrochemical methods. EAC of LMWF at −0.59 V was 12 times higher than that at −0.49 V, while EAC increased to 2.6 times when the Eh decreased from −0.59 V to −0.69 V. Afterward, LMWF can act as a shuttle to stimulate microbial Fe(III) reduction processes in microbial reduction experiments. Additionally, EAC by electrochemical analysis at a range of −0.49–−0.59 V was comparable to total calculated ETC of different molecular weight fractions of HA by microbial reduction. Therefore, it is indicated that redox-active functional groups that can be reduced at Eh range of −0.49–−0.59 are available to microbial reduction. This finding contributes to a novel perspective in the protection and remediation of the groundwater environment in the biogeochemistry process.

Hydroquinone/quinone electro- and photochemical interconversion in isolable polypyridylruthenium(II) complexes

2021 ◽  
Author(s):  
Dai Oyama ◽  
Takatoshi Kanno ◽  
Tsugiko Takase
Keyword(s):  
Electron Transfer ◽  
Metal Complexes ◽  
Transfer Reactions ◽  
Electron Transfer Reactions ◽  
Fundamental Knowledge ◽  
Redox Active ◽  
Quinone Complexes

Quinone derivatives and their metal complexes are well-known molecules that participate in electron-transfer reactions relevant to diverse fields. However, the fundamental knowledge on the unique reactivity of redox-active quinone complexes...

Sulfur in humin as a redox-active element for extracellular electron transfer

Geoderma ◽  
2022 ◽  
Vol 408 ◽  
pp. 115580
Author(s):  
Duyen Minh Pham ◽  
Hiroshi Oji ◽  
Shinya Yagi ◽  
Satoshi Ogawa ◽  
Arata Katayama
Keyword(s):  
Electron Transfer ◽  
Active Element ◽  
Extracellular Electron Transfer ◽  
Redox Active
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