A reduction series of neodymium supported by pyridine(diimine) ligands

2019 ◽  
Vol 48 (23) ◽  
pp. 8021-8025 ◽  
Author(s):  
Shane S. Galley ◽  
Scott A. Pattenaude ◽  
Robert F. Higgins ◽  
Caleb J. Tatebe ◽  
Dalton A. Stanley ◽  
...  
Keyword(s):  
Diimine Ligands ◽  
Reduction Series ◽  
Electron Sink

A series of reduced PDI neodymium complexes by the PDI ligand acting as an electron sink.

scholarly journals Cyanobakterien als Biokatalysatoren

BIOspektrum ◽  
2021 ◽  
Vol 27 (2) ◽  
pp. 208-210
Author(s):  
Marc M. Nowaczyk ◽  
Hanna C. Grimm ◽  
Leen Assil-Companioni ◽  
Robert Kourist
Keyword(s):  
Natural Process ◽  
Oxygenic Photosynthesis ◽  
Phototrophic Microorganisms ◽  
Electron Sink ◽  
Pcc 6803

AbstractThe highly optimized natural process of oxygenic photosynthesis leads to the formation of redox equivalents, such as NADPH, that can be used to fuel heterologous biotransformations in phototrophic microorganisms. We investigated the reduction of 2-methylmaleimide by the ene-reductase YqjM in the cyanobacterium Synechocystis sp. PCC 6803 and doubled the productivity of the cells by inactivating flavodiironproteins (FDPs) as competing electron sink under self-shading conditions, reaching 18.3 mmol h−1 L−1.

scholarly journals Electron donation of non-oxide supports boosts O2 activation on nano-platinum catalysts

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tao Gan ◽  
Jingxiu Yang ◽  
David Morris ◽  
Xuefeng Chu ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Pt Nanoparticles ◽  
Catalytic Performance ◽  
Nitrogen Vacancy ◽  
Innovative Strategy ◽  
Oxide Supports ◽  
Heterogeneous Catalytic ◽  
Highly Active ◽  
Electron Sink ◽  
Nitrogen Vacancies

AbstractActivation of O2 is a critical step in heterogeneous catalytic oxidation. Here, the concept of increased electron donors induced by nitrogen vacancy is adopted to propose an efficient strategy to develop highly active and stable catalysts for molecular O2 activation. Carbon nitride with nitrogen vacancies is prepared to serve as a support as well as electron sink to construct a synergistic catalyst with Pt nanoparticles. Extensive characterizations combined with the first-principles calculations reveal that nitrogen vacancies with excess electrons could effectively stabilize metallic Pt nanoparticles by strong p-d coupling. The Pt atoms and the dangling carbon atoms surround the vacancy can synergistically donate electrons to the antibonding orbital of the adsorbed O2. This synergistic catalyst shows great enhancement of catalytic performance and durability in toluene oxidation. The introduction of electron-rich non-oxide substrate is an innovative strategy to develop active Pt-based oxidation catalysts, which could be conceivably extended to a variety of metal-based catalysts for catalytic oxidation.

New heptacoordinate tungsten(II) complexes with α-diimine ligands in the catalytic oxidation of multifunctional olefins

2021 ◽  
Vol 519 ◽  
pp. 120263
Author(s):  
Maria Vasconcellos-Dias ◽  
Carla D. Nunes ◽  
Vítor Félix ◽  
Paula Brandão ◽  
Maria José Calhorda
Keyword(s):  
Catalytic Oxidation ◽  
Diimine Ligands

scholarly journals Assessment of Voltage Influence in Carbon Dioxide Fixation Process by a Photo-Bioelectrochemical System under Photoheterotrophy

2021 ◽  
Vol 9 (3) ◽  
pp. 474
Author(s):  
Sara Díaz-Rullo Edreira ◽  
Silvia Barba ◽  
Ioanna A. Vasiliadou ◽  
Raúl Molina ◽  
Juan Antonio Melero ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Source ◽  
Future Development ◽  
Metabolic Pathways ◽  
Co2 Fixation ◽  
Oxygen Demand ◽  
Carbon Uptake ◽  
Bioelectrochemical System ◽  
Electron Sink ◽  
Soluble Carbon

Bioelectrochemical systems are a promising technology capable of reducing CO2 emissions, a renewable carbon source, using electroactive microorganisms for this purpose. Purple Phototrophic Bacteria (PPB) use their versatile metabolism to uptake external electrons from an electrode to fix CO2. In this work, the effect of the voltage (from −0.2 to −0.8 V vs. Ag/AgCl) on the metabolic CO2 fixation of a mixed culture of PPB under photoheterotrophic conditions during the oxidation of a biodegradable carbon source is demonstrated. The minimum voltage to fix CO2 was between −0.2 and −0.4 V. The Calvin–Benson–Bassham (CBB) cycle is the main electron sink at these voltages. However, lower voltages caused the decrease in the current intensity, reaching a minimum at −0.8 V (−4.75 mA). There was also a significant relationship between the soluble carbon uptake in terms of chemical oxygen demand and the electron consumption for the experiments performed at −0.6 and −0.8 V. These results indicate that the CBB cycle is not the only electron sink and some photoheterotrophic metabolic pathways are also being affected under electrochemical conditions. This behavior has not been tested before in photoheterotrophic conditions and paves the way for the future development of photobioelectrochemical systems under heterotrophic conditions.

Dinuclear nitrido-bridged ruthenium complexes bearing diimine ligands

2017 ◽  
Vol 46 (41) ◽  
pp. 14256-14263 ◽  
Author(s):  
Julie Urgiles ◽  
Sarah R. Nathan ◽  
Samantha N. MacMillan ◽  
Justin J. Wilson
Keyword(s):  
Calcium Uptake ◽  
Ruthenium Complexes ◽  
Ligand Substitution ◽  
Mitochondrial Calcium ◽  
Substitution Reactions ◽  
Uptake Inhibition ◽  
Diimine Ligands ◽  
Mitochondrial Calcium Uptake ◽  
Ligand Substitution Reactions

Nitrido-bridged ruthenium complexes are synthesized via ligand substitution reactions and evaluated for mitochondrial calcium uptake inhibition.

scholarly journals An Integrated Proteomics/Transcriptomics Approach Points to Oxygen as the Main Electron Sink for Methanol Metabolism in Methylotenera mobilis

2011 ◽  
Vol 193 (18) ◽  
pp. 4758-4765 ◽  
Author(s):  
D. A. C. Beck ◽  
E. L. Hendrickson ◽  
A. Vorobev ◽  
T. Wang ◽  
S. Lim ◽  
...  
Keyword(s):  
Methanol Metabolism ◽  
Electron Sink

scholarly journals Flavodiiron proteins act as safety valve for electrons in Physcomitrella patens

2016 ◽  
Vol 113 (43) ◽  
pp. 12322-12327 ◽  
Author(s):  
Caterina Gerotto ◽  
Alessandro Alboresi ◽  
Andrea Meneghesso ◽  
Martina Jokel ◽  
Marjaana Suorsa ◽  
...  
Keyword(s):  
Electron Transport ◽  
Photosystem I ◽  
Physcomitrella Patens ◽  
Safety Valve ◽  
Cell Metabolism ◽  
Photosynthetic Apparatus ◽  
Photosynthetic Electron Transport ◽  
Flowering Plants ◽  
Knock Out ◽  
Electron Sink

Photosynthetic organisms support cell metabolism by harvesting sunlight to fuel the photosynthetic electron transport. The flow of excitation energy and electrons in the photosynthetic apparatus needs to be continuously modulated to respond to dynamics of environmental conditions, and Flavodiiron (FLV) proteins are seminal components of this regulatory machinery in cyanobacteria. FLVs were lost during evolution by flowering plants, but are still present in nonvascular plants such as Physcomitrella patens. We generated P. patens mutants depleted in FLV proteins, showing their function as an electron sink downstream of photosystem I for the first seconds after a change in light intensity. flv knock-out plants showed impaired growth and photosystem I photoinhibition when exposed to fluctuating light, demonstrating FLV’s biological role as a safety valve from excess electrons on illumination changes. The lack of FLVs was partially compensated for by an increased cyclic electron transport, suggesting that in flowering plants, the FLV’s role was taken by other alternative electron routes.

High catalytic abilities of binuclear rhenium(i) complexes in the photochemical reduction of CO2 with a ruthenium(ii) photosensitiser

2016 ◽  
Vol 45 (37) ◽  
pp. 14668-14677 ◽  
Author(s):  
Yusuke Tamaki ◽  
Daisuke Imori ◽  
Tatsuki Morimoto ◽  
Kazuhide Koike ◽  
Osamu Ishitani
Keyword(s):  
Photochemical Reduction ◽  
Alkyl Chains ◽  
Diimine Ligands ◽  
Reduction Of Co2

Photocatalytic systems for CO2 reduction using a Ru(ii) photosensitiser and dinuclear Re(i) diimine tricarbonyl complexes (Re(n)Re), in which diimine ligands are connected by alkyl chains of various lengths (–CnH2n–: n = 2, 3, 4, 6, 14), as catalysts were investigated.

Outstanding blue delayed fluorescence and significant processing stability of cuprous complexes with functional pyridine–pyrazolate diimine ligands

2015 ◽  
Vol 44 (15) ◽  
pp. 6706-6710 ◽  
Author(s):  
Qing Zhang ◽  
Jun Chen ◽  
Xiao-Yuan Wu ◽  
Xu-Lin Chen ◽  
Rongmin Yu ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Quantum Yields ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Diimine Ligands ◽  
Processing Stability

Five cuprous complexes display outstanding blue thermally activated delayed fluorescence (TADF) with quantum yields near 1 and significant processing stability from the solid to the solvent states.

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