Host molecules containing electroactive cavities obtained by the molecular assembly of redox-active ligands and metal ions

1995 ◽  
pp. 1643-1644 ◽  
Author(s):  
María José L. Tendero ◽  
Angel Benito ◽  
Juan Cano ◽  
Jose Manuel Lloris ◽  
Ramón Martínez-Máñez ◽  
...  
Keyword(s):  
Metal Ions ◽  
Molecular Assembly ◽  
Redox Active Ligands ◽  
Host Molecules ◽  
Redox Active

scholarly journals Annulation of a 1,3-dithiole ring to a sterically hindered o-quinone core. Novel ditopic redox-active ligands

2021 ◽  
Vol 17 ◽  
pp. 273-282 ◽  
Author(s):  
Sergey V Norkov ◽  
Anton V Cherkasov ◽  
Andrey S Shavyrin ◽  
Maxim V Arsenyev ◽  
Viacheslav A Kuropatov ◽  
...  
Keyword(s):  
Metal Ions ◽  
Spin Density ◽  
Functional Groups ◽  
Quinone Methide ◽  
Redox Activity ◽  
The Novel ◽  
Redox Active Ligands ◽  
Redox Active ◽  
Sterically Hindered ◽  
Quinone Derivative

The fused 1,3-dithiole spacer seems to be very suitable for the functionalization of sterically hindered o-quinones with additional groups capable of coordination of metal ions and/or possessing a redox activity. An effective method for the synthesis of sterically hindered o-quinones containing 1,3-diketonate, dinitrile and p-quinone-methide functional groups at the periphery of the ligand has been developed. The novel compounds have rigid and conjugated structures and exhibit properties typical of o-quinones. A study of their monoreduced semiquinone derivatives reveal that the spin density is delocalized across the whole molecule, including peripheral fragments. The first stable o-quinone derivative bearing an annulated thiete heterocycle has been isolated and characterized.

scholarly journals Small Molecule-Induced Intramolecular Electron “Pitch and Catch” in a RhodiumIComplex with Substitutionally Inert Redox-Active Ligands.

1999 ◽  
Vol 38 (18) ◽  
pp. 4176-4176
Author(s):  
Igor V. Kourkine ◽  
Caroline S. Slone ◽  
Chad A. Mirkin ◽  
Louise M. Liable-Sands ◽  
Arnold L. Rheingold
Keyword(s):  
Small Molecule ◽  
Redox Active Ligands ◽  
Redox Active

scholarly journals Anodic Stripping Voltammetry with the Hanging Mercury Drop Electrode for Trace Metal Detection in Soil Samples

Chemosensors ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 107
Author(s):  
Kequan Xu ◽  
Clara Pérez-Ràfols ◽  
Amine Marchoud ◽  
María Cuartero ◽  
Gastón A. Crespo
Keyword(s):  
Metal Ions ◽  
Limit Of Detection ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Hanging Mercury Drop Electrode ◽  
Mercury Drop Electrode ◽  
Redox Active ◽  
Active Metal ◽  
Metal Detection ◽  
Trace Metal Detection

The widely spread use of the hanging mercury drop electrode (HMDE) for multi-ion analysis is primarily ascribed to the following reasons: (i) excellent reproducibility owing to the easy renewal of the electrode surface avoiding any hysteresis effect (i.e., a new identical drop is generated for each measurement to be accomplished); (ii) a wide cathodic potential window originating from the passive hydrogen evolution and solvent electrolysis; (iii) the ability to form amalgams with many redox-active metal ions; and (iv) the achievement of (sub)nanomolar limits of detection. On the other hand, the main controversy of the HMDE usage is the high toxicity level of mercury, which has motivated the scientific community to question whether the HMDE deserves to continue being used despite its unique capability for multi-metal detection. In this work, the simultaneous determination of Zn2+, Cd2+, Pb2+, and Cu2+ using the HMDE is investigated as a model system to evaluate the main features of the technique. The analytical benefits of the HMDE in terms of linear range of response, reproducibility, limit of detection, proximity to ideal redox behavior of metal ions and analysis time are herein demonstrated and compared to other electrodes proposed in the literature as less-toxic alternatives to the HMDE. The results have revealed that the HMDE is largely superior to other reported methods in several aspects and, moreover, it displays excellent accuracy when simultaneously analyzing Zn2+, Cd2+, Pb2+, and Cu2+ in such a complex matrix as digested soils. Yet, more efforts are required towards the definitive replacement of the HMDE in the electroanalysis field, despite the elegant approaches already reported in the literature.

Metal-Metal Interactions in Heterobimetallic Complexes with Dinucleating Redox-Active Ligands

2016 ◽  
Vol 128 (7) ◽  
pp. 2452-2456 ◽  
Author(s):  
Daniël L. J. Broere ◽  
Dieuwertje K. Modder ◽  
Eva Blokker ◽  
Maxime A. Siegler ◽  
Jarl Ivar van der Vlugt
Keyword(s):  
Redox Active Ligands ◽  
Metal Interactions ◽  
Heterobimetallic Complexes ◽  
Redox Active ◽  
Metal Metal

Synthesis of fluorescent molecular switches based on porphyrinoids covalently linked with redox active ligands

2022 ◽  
Vol 1247 ◽  
pp. 131407
Author(s):  
Kharu Nisa ◽  
Gaurav Kumar Mishra ◽  
M. Thirumal ◽  
Shive M.S. Chauhan
Keyword(s):  
Molecular Switches ◽  
Redox Active Ligands ◽  
Redox Active ◽  
Covalently Linked

Electrochemical characterization of Cu(II) complexes of brain-related tau peptides

2021 ◽  
Vol 99 (7) ◽  
pp. 628-636
Author(s):  
Camilla Golec ◽  
Jose O. Esteves-Villanueva ◽  
Sanela Martic
Keyword(s):  
Metal Ions ◽  
Tau Protein ◽  
Metal Ion ◽  
Differential Pulse ◽  
Redox Couple ◽  
Peptide Sequence ◽  
Binding Studies ◽  
Biologically Relevant ◽  
Redox Active ◽  
Competition Binding

Metal ion dyshomeostasis plays an important role in diseases, including neurodegeneration. Tau protein is a known neurodegeneration biomarker, but its interactions with biologically relevant metal ions, such as Cu(II), are not fully understood. Herein, the Cu(II) complexes of four tau R peptides, based on the tau repeat domains, R1, R2, R3, and R4, were characterized by electrochemical methods, including cyclic voltammetry, square-wave voltammetry, and differential pulse voltammetry in solution under aerobic conditions. The current and potential associated with Cu(II)/(I) redox couple was modulated as a function of R peptide sequence and concentration. All R peptides coordinated Cu(II) resulting in a dramatic decrease in the current associated with free Cu(II), and the appearance of a new redox couple due to metallo–peptide complex. The metallo–peptide complexes were characterized by the irreversible redox couple at more positive potentials and slower electron-transfer rates compared with the free Cu(II). The competition binding studies between R peptides with Cu(II) indicated that the strongest binding affinity was observed for the R3 peptide, which contained 2 His and 1 Cys residues. The formation of complexes was also evaluated as a function of peptide concentration and in the presence of competing Zn(II) ions. Data indicate that all metallo–peptides remain redox active pointing to the potential importance of the interactions between tau protein with metal ions in a biological setting.

scholarly journals Circumventing Intrinsic Metal Reactivity: Radical Generation with Redox-Active Ligands

2017 ◽  
Vol 23 (60) ◽  
pp. 15030-15034 ◽  
Author(s):  
Jérémy Jacquet ◽  
Khaled Cheaib ◽  
Yufeng Ren ◽  
Hervé Vezin ◽  
Maylis Orio ◽  
...  
Keyword(s):  
Redox Active Ligands ◽  
Redox Active ◽  
Radical Generation
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