Coordination-driven assembly of a supramolecular square and oxidation to a tetra-ligand radical species

2019 ◽  
Vol 55 (43) ◽  
pp. 6082-6085 ◽  
Author(s):  
Khrystyna Herasymchuk ◽  
Jessica J. Miller ◽  
Gregory A. MacNeil ◽  
Ania S. Sergeenko ◽  
Declan McKearney ◽  
...  
Keyword(s):  
Radical Species ◽  
Design And Synthesis ◽  
Redox Active

The design and synthesis of a supramolecular square was achieved by coordination-driven assembly of redox-active nickel(ii) salen linkers and (ethylenediamine)palladium(ii) nodes.

Dioxygen-derived radicals in biological systems

1985 ◽  
Vol 311 (1152) ◽  
pp. 605-615 ◽  
Keyword(s):  
Respiratory Burst ◽  
Electrochemical Method ◽  
Culture Medium ◽  
Biological Systems ◽  
Cellular Systems ◽  
Superoxide Ion ◽  
Radical Species ◽  
Redox Active ◽  
Active Metal ◽  
Redox Active Metal

Three instances of the involvement of dioxygen-derived radicals in biological systems are considered. The first concerns the formation of radicals in the haemolytic reactions induced by treatment of erythrocytes by phenylhydrazine, as an example of the so-called ‘oxidant drugs’. The evidence for the formation of phenyl radicals is considered and their origin in the oxidation of phenylhydrazine by a ferryl derivative of haemoglobin postulated. The relevance to the formation of phenylated iron and porphyrin species is described. It is suspected that many instances of oxidative damage to cellular systems result from the coincidence of unsequestered redox-active metal ions (particularly those of iron and copper), reductants, and dioxygen. As an example, the damage to hepatocytes, grown in a culture medium containing cysteine, is described. The formation of radical species derived from dioxygen during the respiratory burst associated with phagocytosis is discussed. A new electrochemical method of detecting the superoxide ion produced during the respiratory burst is described. Particular emphasis is placed on the relation between the production of radical species such as the hydroxyl radical and the superoxide ion, and the extent of phagocytosis.

scholarly journals Structural and spectroscopic investigations of nine-coordinate redox active lanthanide complexes with a pincer O,N,O ligand

2020 ◽  
Vol 49 (24) ◽  
pp. 8238-8246 ◽  
Author(s):  
D. Mouchel Dit Leguerrier ◽  
R. Barré ◽  
M. Bryden ◽  
D. Imbert ◽  
C. Philouze ◽  
...  
Keyword(s):  
Lanthanide Complexes ◽  
Radical Species ◽  
Spectroscopic Investigations ◽  
Redox Active

Three ligand molecules coordinate under their anionic diamagnetic form; the complexes (Gd, Eu, Yb, Lu) can undergo reversible oxidations, affording radical species, as demonstrated by spectro-electrochemistry.

scholarly journals Generation of Bis(ferrocenyl)silylenes from Siliranes

Molecules ◽  
2020 ◽  
Vol 25 (24) ◽  
pp. 5917
Author(s):  
Yang Pan ◽  
Shogo Morisako ◽  
Shinobu Aoyagi ◽  
Takahiro Sasamori
Keyword(s):  
Transition Metal ◽  
Building Block ◽  
Building Blocks ◽  
Redox Behavior ◽  
Organosilicon Compounds ◽  
Design And Synthesis ◽  
Mild Conditions ◽  
Redox Active ◽  
Electronic Perturbation ◽  
Active Transition

Divalent silicon species, the so-called silylenes, represent attractive organosilicon building blocks. Isolable stable silylenes remain scarce, and in most hitherto reported examples, the silicon center is stabilized by electron-donating substituents (e.g., heteroatoms such as nitrogen), which results in electronic perturbation. In order to avoid such electronic perturbation, we have been interested in the chemistry of reactive silylenes with carbon-based substituents such as ferrocenyl groups. Due to the presence of a divalent silicon center and the redox-active transition metal iron, ferrocenylsilylenes can be expected to exhibit interesting redox behavior. Herein, we report the design and synthesis of a bis(ferrocenyl)silirane as a precursor for a bis(ferrocenyl)silylene, which could potentially be used as a building block for redox-active organosilicon compounds. It was found that the isolated bis(ferrocenyl)siliranes could be a bottleable precursor for the bis(ferrocenyl)silylene under mild conditions.

Seven-coordinate lanthanide complexes with a tripodal redox active ligand: structural, electrochemical and spectroscopic investigations

2018 ◽  
Vol 47 (31) ◽  
pp. 10742-10751 ◽  
Author(s):  
Jennifer K. Molloy ◽  
Christian Philouze ◽  
Lionel Fedele ◽  
Daniel Imbert ◽  
Olivier Jarjayes ◽  
...  
Keyword(s):  
Lanthanide Complexes ◽  
Phenoxyl Radical ◽  
Radical Formation ◽  
Radical Species ◽  
Spectroscopic Investigations ◽  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active

One-electron oxidation of the lanthanide complexes affords phenoxyl radical species. Radical formation is accompanied by a quenching of the metal-based luminescence.

Using Redox-Active Ligands to Generate Actinide Ligand Radical Species

2021 ◽  
Author(s):  
Shane S. Galley ◽  
Scott A. Pattenaude ◽  
Debmalya Ray ◽  
Carlo Alberto Gaggioli ◽  
Megan A. Whitefoot ◽  
...  
Keyword(s):  
Radical Species ◽  
Redox Active Ligands ◽  
Redox Active

Hybrid Organic Electrodes: The Rational Design and Synthesis of High-Energy Redox-Active Pendant Functionalized Polypyrroles for Electrochemical Energy Storage

2017 ◽  
Vol 164 (9) ◽  
pp. A1946-A1951 ◽  
Author(s):  
Luxi Shen ◽  
Masato Mizutani ◽  
Gabriel G. Rodríguez-Calero ◽  
Kenneth Hernández-Burgos ◽  
Thanh-Tam Truong ◽  
...  
Keyword(s):  
Energy Storage ◽  
Rational Design ◽  
High Energy ◽  
Electrochemical Energy Storage ◽  
Design And Synthesis ◽  
Redox Active ◽  
Electrochemical Energy ◽  
Organic Electrodes

Synthesis and electrochemical properties of ferrocene dimers and trimers bridged by an oligothiophene spacer

2012 ◽  
Vol 85 (4) ◽  
pp. 777-784 ◽  
Author(s):  
Hiroki Muraoka ◽  
Satoshi Ogawa
Keyword(s):  
Electron Transfer ◽  
Cyclic Voltammetry ◽  
Electrochemical Properties ◽  
Redox Reactions ◽  
Redox Potentials ◽  
Design And Synthesis ◽  
Transfer Processes ◽  
Redox Active ◽  
Hybrid Molecules ◽  
Electron Transfer Processes

We describe the design and synthesis of ferrocene dimers and trimers bridged by an oligothiophene spacer as both cathodic and anodic multiple redox-active organic–organometallic hybrid molecules. The electrochemical properties of all compounds were examined by cyclic voltammetry (CV). The voltammograms showed different multi-step, multi-electron redox reactions derived from multi-ferrocene fragments and the organic spacer. The results indicate that a number of thiophene rings in the spacer can be attuned to the redox potentials and the electron-transfer processes.

Elucidation of Thorium Redox-Active Ligand Complexes: Evidence for a Thorium-Tri(radical) Species

2021 ◽  
Author(s):  
D. M. Ramitha Y. P. Rupasinghe ◽  
Himanshu Gupta ◽  
Makayla R. Baxter ◽  
Robert F. Higgins ◽  
Matthias Zeller ◽  
...  
Keyword(s):  
Radical Species ◽  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active

Design and synthesis of a redox-active tc-99m radiopharmaceutical with ferrocenedithiocarboxylate [FcCS = Fe(C5H4CS2)(C5H5)−]

1999 ◽  
Vol 26 (1) ◽  
pp. 63-67 ◽  
Author(s):  
Licia Uccelli ◽  
Cristina Bolzati ◽  
Alessandra Boschi ◽  
Adriano Duatti ◽  
Christophe Morin ◽  
...  
Keyword(s):  
Design And Synthesis ◽  
Redox Active
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