Structural, Spectroscopic, and Electrochemical Studies of Binuclear Manganese(II) Complexes of Bis(pentadentate) Ligands Derived from Bis(1,4,7-triazacyclononane) Macrocycles

2000 ◽  
Vol 39 (5) ◽  
pp. 881-892 ◽  
Author(s):  
Suzanne J. Brudenell ◽  
Leone Spiccia ◽  
Alan M. Bond ◽  
Gary D. Fallon ◽  
David C. R. Hockless ◽  
...  
Keyword(s):  
Electrochemical Studies ◽  
Pentadentate Ligands

Electrochemical studies of manganese(II) complexes containing pentadentate ligands with O2N3, O3N2, and O2SN2 donor sets

1981 ◽  
Vol 20 (3) ◽  
pp. 700-706 ◽  
Author(s):  
W. M. Coleman ◽  
R. K. Boggess ◽  
J. W. Hughes ◽  
L. T. Taylor
Keyword(s):  
Electrochemical Studies ◽  
Pentadentate Ligands

ChemInform Abstract: ELECTROCHEMICAL STUDIES ON A SERIES OF MANGANESE(III) COMPLEXES CONTAINING SYMMETRICAL PENTADENTATE LIGANDS

1979 ◽  
Vol 10 (31) ◽  
Author(s):  
W. M. COLEMAN ◽  
R. R. GOEHRING ◽  
L. T. TAYLOR ◽  
J. G. MASON ◽  
R. K. BOGGESS
Keyword(s):  
Electrochemical Studies ◽  
Pentadentate Ligands

Electrochemical studies on a series of manganese(III) complexes containing symmetrical pentadentate ligands

1979 ◽  
Vol 101 (9) ◽  
pp. 2311-2315 ◽  
Author(s):  
W. M. Coleman ◽  
R. R. Goehring ◽  
L. T. Taylor ◽  
J. G. Mason ◽  
R. K. Boggess
Keyword(s):  
Electrochemical Studies ◽  
Pentadentate Ligands

Structural, EPR, and Electrochemical Studies of Binuclear Copper(II) Complexes of Bis(pentadentate) Ligands Derived from Bis(1,4,7-triazacyclonane) Macrocycles

1998 ◽  
Vol 37 (15) ◽  
pp. 3705-3713 ◽  
Author(s):  
Suzanne J. Brudenell ◽  
Leone Spiccia ◽  
Alan M. Bond ◽  
Peter Comba ◽  
David C. R. Hockless
Keyword(s):  
Electrochemical Studies ◽  
Binuclear Copper ◽  
Pentadentate Ligands

A Pyridinic Fe-N4 Macrocycle Effectively Models the Active Sites in Fe/N-Doped Carbon Electrocatalysts

2020 ◽  
Author(s):  
Travis Marshall-Roth ◽  
Nicole J. Libretto ◽  
Alexandra T. Wrobel ◽  
Kevin Anderton ◽  
Nathan D. Ricke ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Active Sites ◽  
Catalytic Properties ◽  
Reduction Reaction ◽  
Iron Phthalocyanine ◽  
Electrochemical Studies ◽  
Onset Potential ◽  
Nitrogen Doped Carbon ◽  
Iron Active Sites

Iron- and nitrogen-doped carbon (Fe-N-C) materials are leading candidates to replace platinum in fuel cells, but their active site structures are poorly understood. A leading postulate is that iron active sites in this class of materials exist in an Fe-N<sub>4</sub> pyridinic ligation environment. Yet, molecular Fe-based catalysts for the oxygen reduction reaction (ORR) generally feature pyrrolic coordination and pyridinic Fe-N<sub>4</sub> catalysts are, to the best of our knowledge, non-existent. We report the synthesis and characterization of a molecular pyridinic hexaazacyclophane macrocycle, (phen<sub>2</sub>N<sub>2</sub>)Fe, and compare its spectroscopic, electrochemical, and catalytic properties for oxygen reduction to a prototypical Fe-N-C material, as well as iron phthalocyanine, (Pc)Fe, and iron octaethylporphyrin, (OEP)Fe, prototypical pyrrolic iron macrocycles. N 1s XPS signatures for coordinated N atoms in (phen<sub>2</sub>N<sub>2</sub>)Fe are positively shifted relative to (Pc)Fe and (OEP)Fe, and overlay with those of Fe-N-C. Likewise, spectroscopic XAS signatures of (phen<sub>2</sub>N<sub>2</sub>)Fe are distinct from those of both (Pc)Fe and (OEP)Fe, and are remarkably similar to those of Fe-N-C with compressed Fe–N bond lengths of 1.97 Å in (phen<sub>2</sub>N<sub>2</sub>)Fe that are close to the average 1.94 Å length in Fe-N-C. Electrochemical studies establish that both (Pc)Fe and (phen<sub>2</sub>N<sub>2</sub>)Fe have relatively high Fe(III/II) potentials at ~0.6 V, ~300 mV positive of (OEP)Fe. The ORR onset potential is found to directly correlate with the Fe(III/II) potential leading to a ~300 mV positive shift in the onset of ORR for (Pc)Fe and (phen<sub>2</sub>N<sub>2</sub>)Fe relative to (OEP)Fe. Consequently, the ORR onset for (phen<sub>2</sub>N<sub>2</sub>)Fe and (Pc)Fe is within 150 mV of Fe-N-C. Unlike (OEP)Fe and (Pc)Fe, (phen<sub>2</sub>N<sub>2</sub>)Fe displays excellent selectivity for 4-electron ORR with <4% maximum H<sub>2</sub>O<sub>2</sub> production, comparable to Fe-N-C materials. The aggregate spectroscopic and electrochemical data establish (phen<sub>2</sub>N<sub>2</sub>)Fe as a pyridinic iron macrocycle that effectively models Fe-N-C active sites, thereby providing a rich molecular platform for understanding this important class of catalytic materials.<p><b></b></p>

Inhibition Effects of Some Organic Compounds on Zinc Corrosion in 3.5% NaCl

2008 ◽  
Vol 59 (5) ◽  
Author(s):  
Viorel Branzoi ◽  
Alina Pruna ◽  
Florina Branzoi
Keyword(s):  
Organic Compounds ◽  
Electrochemical Impedance ◽  
Corrosion Process ◽  
Diffusion Control ◽  
Cathodic Reaction ◽  
Zinc Electrode ◽  
Electrochemical Studies ◽  
Nacl Solution ◽  
Sodium Dodecylsulphate ◽  
Zinc Corrosion

The inhibition of zinc corrosion in 3.5% NaCl solution by some organic compounds (sodium dodecylsulphate (SDS), sodium dodecylbenzosulphonate (SDBS) and sodium 1,4-bis(2-etylhexyl) sulphosuccinate (AOT)) was investigated. The inhibition efficiencies were determined by polarization measurements of the zinc electrode in the solution. Electrochemical impedance spectroscopy (EIS) was also used for electrochemical studies of zinc electrode in this medium. The results showed that the used surfactants inhibit the cathodic reaction of hydrogen evolution and at low anodic overvoltage the corrosion process is under activation control, while at high anodic overvoltage the process is under diffusion control.

QCM and Electrochemical Studies of Li Intercalation in V6O13

1990 ◽  
Author(s):  
Heai-Ku Park ◽  
Kathryn Podolske ◽  
Zafar Munshi ◽  
W. H. Smyrl ◽  
B. B. Owens
Keyword(s):  
Electrochemical Studies
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