Structure and electrochemical properties of (μ-O)2Mn2(iii,iii) and (μ-O)2Mn2(iii,iv) complexes supported by pyridine-, quinoline-, isoquinoline- and quinoxaline-based tetranitrogen ligands

2021 ◽  
Vol 50 (12) ◽  
pp. 4133-4144
Author(s):  
Yuji Mikata ◽  
Yasuko Kuroda ◽  
Kyoko Naito ◽  
Kana Murakami ◽  
Chihiro Yamamoto ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Structural Parameters ◽  
Redox Potentials ◽  
Systematic Comparison ◽  
Ligand Effects

A systematic comparison of a total of 14 complexes bearing a (μ-O)2Mn2 core with tetranitrogen ligands reveals small but solid relationships between structural parameters and redox potentials induced by ligand effects.

Mono- and tri-β-substituted unsymmetrical metalloporphyrins: synthesis, structural, spectral and electrochemical properties

RSC Advances ◽  
2015 ◽  
Vol 5 (82) ◽  
pp. 66824-66832 ◽  
Author(s):  
Kamal Prakash ◽  
Ravi Kumar ◽  
Muniappan Sankar
Keyword(s):  
Electrochemical Properties ◽  
Dramatic Reduction ◽  
Redox Potentials ◽  
Electrochemical Redox ◽  
Spectral And Electrochemical Properties ◽  
Homo Lumo

Mono-/tri-β-substituted metalloporphyrins have been synthesized and characterized. Dramatic reduction in the HOMO–LUMO gap with tunable electronic, spectral and electrochemical redox potentials were observed as the number of electron withdrawing groups increased.

scholarly journals Electrochemical behaviours of Eu(III)/E(II) and Ce(IV)/Ce(III) in H3PO4-H2O media : solvation and complexation reactions

2018 ◽  
Vol 149 ◽  
pp. 01092
Author(s):  
B. Belqat ◽  
S. Belcadi
Keyword(s):  
Rare Earth ◽  
Phosphoric Acid ◽  
Rare Earth Elements ◽  
Electrochemical Properties ◽  
Essential Elements ◽  
High Tech ◽  
Electrochemical Studies ◽  
Redox Potentials ◽  
Complexation Reactions ◽  
Phosphoric Acid Concentration

Many kinds of rare earth elements (REE) such as europium and cerium have been make them essential elements in many high-tech components. The electrochemical studies can be presented as an interesting indication for europium and cerium extraction from phosphoric solutions, including solvation and complexation reactions. The normal redox potentials of Eu3+/Eu2+ and Ce4+/Ce3+ systems have been determined in H3PO4-H2O media with various phosphoric acid concentration. The solvation of these elements in phosphoric media is characterized by their transfer activity coefficients "f" calculated from the corresponding normal redox potentials. The corresponding solvation increases with increasing the H3PO4 concentration. For each REE, the electrochemical properties depend on its number of charges and on its basic properties. Results suggest that solvation and complexation of REE phosphates are important in controlling REE concentration.

Ligand effects on the redox potentials of metal carbonyls

Polyhedron ◽  
1983 ◽  
Vol 2 (9) ◽  
pp. 929-934 ◽  
Author(s):  
J.W. Hershberger ◽  
J.K. Kochi
Keyword(s):  
Redox Potentials ◽  
Metal Carbonyls ◽  
Ligand Effects

On the effect of ion pairing of Keggin type polyanions with quaternary ammonium cations on redox potentials in organic solvents

2016 ◽  
Vol 18 (32) ◽  
pp. 22487-22493 ◽  
Author(s):  
Bo Chen ◽  
Ronny Neumann
Keyword(s):  
Electrochemical Properties ◽  
Organic Solvents ◽  
Quaternary Ammonium ◽  
Ion Pairing ◽  
Redox Potentials ◽  
Quaternary Ammonium Cations ◽  
Keggin Type

The electrochemical properties of polyoxometalates in organic solvents show an interrelation between redox potentials, solvents and ion pairing.

Syntheses, electrochemistry and photophysical properties of a series ofmeso-pyridylpentafluorophenylporphyrins

2010 ◽  
Vol 14 (11) ◽  
pp. 975-984 ◽  
Author(s):  
Emmanuel Z. Moreira ◽  
Alba D.Q. Ferreira ◽  
Cláudio Roberto Neri ◽  
Sumitra Mukhopadhyay ◽  
Sérgio Dovidauskas ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Photophysical Properties ◽  
Synthesis And Characterization ◽  
Redox Potentials ◽  
Trans Isomers ◽  
X Ray ◽  
X Ray Crystallography ◽  
Cis And Trans Isomers ◽  
Cis And Trans

This work presents the synthesis and characterization of a series of substituted pyridylpentafluroporphyrins, including the separation of the cis- and trans-isomers, the latter being characterized by X-ray crystallography. The spectroscopic and electrochemical properties of the series are dependent on the number of electron withdrawing pentafluorophenyl substituent, but they do not depend on the symmetry of the molecule. Ongoing from the monosubstituted to the more substituted pentafluorophenyl porphyrin H2(MPyTFPP) derivative, the Soret bands are slightly red-shifted and their quantum fluorescence yields range from 0.035 to 0.046, consistent with the value of 0.045 for the fully substituted 5,10,15,20-tetrapentafluorophenylporphyrin (dichloromethane solutions). The redox potentials of the reductive processes of monoanion and dianion formation are also sensitive to the number of pentafluoro substituents, shifting 180 mV to more positive values for the P0/P-1process ongoing from the monopentafluoro to the tris-pentafluorophenyl substituted derivative.

The Phthalocyanines — Molecules of Enduring Value; a Two-dimensional Analysis of Redox Potentials

1999 ◽  
Vol 03 (06) ◽  
pp. 488-499 ◽  
Author(s):  
A. B. P. LEVER
Keyword(s):  
Electrochemical Properties ◽  
Preliminary Test ◽  
Two Dimensional ◽  
Redox Potentials ◽  
Dimensional Approach ◽  
Sensor Applications ◽  
Electrochemical Parameters ◽  
Substituent Constants ◽  
Design Requirements ◽  
Hammett Parameters

The sensor applications of MPc derivatives on carbon-type electrodes are briefly reviewed. The electrochemical properties of metallophthalocyanines in solution and on a surface are reviewed with emphasis on predicting redox potentials using Hammett substituent constants and using ligand electrochemical parameters. Design requirements for a two-electron redox process at a metallophthalocyanine center are discussed. A two-dimensional approach using both Hammett parameters and ligand electrochemical parameters is introduced. Some preliminary test examples are presented.

Synthesis and electrochemical properties of bis(octacyanophthalocyaninato)neodymium(III) complex

2005 ◽  
Vol 09 (01) ◽  
pp. 54-58 ◽  
Author(s):  
Tatsuya Yonekura ◽  
Takeo Ohsaka ◽  
Fusao Kitamura ◽  
Koichi Tokuda
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Properties ◽  
Electrochemical Behavior ◽  
Redox Reactions ◽  
Square Wave Voltammetry ◽  
Cyano Group ◽  
Cyclic Voltammogram ◽  
Redox Potentials ◽  
Strong Electron ◽  
Wave Voltammetry

The bis(octacyanophthalocyaninato)neodymium(III) was synthesized and its electrochemical behavior in N,N-dimethylformamide ( DMF ) was investigated by cyclic voltammetry (CV) and square wave voltammetry (SWV). Multiple redox reactions were observed on the cyclic voltammogram, although the voltammetric feature was complicated due to aggregation. With the aid of SWV, it was concluded that the redox potentials of the complex positively shifted by about 700 mV compared with potentials of the unsubstituted complex, which was ascribed to the strong electron-withdrawn effect of the substituted cyano group.

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.

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