Spectroelectrochemical behavior of N-confused dioxohexaphyrins

2005 ◽  
Vol 09 (12) ◽  
pp. 813-820 ◽  
Author(s):  
Ildemar Mayer ◽  
Kiyohisa Nakamura ◽  
Alagar Srinivasan ◽  
Hiroyuki Furuta ◽  
Henrique E. Toma ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Transition Metal ◽  
Metal Ions ◽  
Electrochemical Properties ◽  
Energy Levels ◽  
Transition Metal Ions ◽  
Complex Behavior ◽  
Free Base ◽  
Conformational Effects ◽  
The Rich

Doubly N -confused dioxohexaphyrins were characterized by cyclic voltammetry and spectroelectrochemistry in the -2.5 to +2.0 V vs Ag | Ag + (0.10 M, in CH3CN) range. Six reversible monoelectronic processes were found suggesting that the rich electrochemistry of porphyrin systems was preserved in that expanded macrocycle. However, the electronic and electrochemical properties of the free-base, Cu(II) and Ni(II) species were shown to be sensitive to the coordinated transition metal ions and solvent revealing a quite complex behavior, probably reflecting the higher flexibility and strong conformational effects on the energy levels and stability of those complexes.

Impact of lithium excess on the structural and electrochemical properties of the LiNi0.5Mn1.5O4high-voltage cathode material

2015 ◽  
Vol 3 (40) ◽  
pp. 20103-20107 ◽  
Author(s):  
Yu-Feng Deng ◽  
Shi-Xi Zhao ◽  
Peng-Yuan Zhai ◽  
Guozhong Cao ◽  
Ce-Wen Nan
Keyword(s):  
Transition Metal ◽  
Cathode Material ◽  
Metal Ions ◽  
Phase Change ◽  
Electrochemical Properties ◽  
Transition Metal Ions ◽  
Octahedral Sites ◽  
Tetrahedral Sites ◽  
One Step ◽  
Co Precipitation

Li1+xNi0.5−xMn1.5O4, madeviaa novel one-step co-precipitation route, undergoes a disordered-to-ordered phase change. Transition metal ions in tetrahedral sites could influence the performance more than the cationic ordering in octahedral sites does.

scholarly journals Electrochemical Sensitive Detection of Hydrazine Through Cobalt Doped Cerium Oxide Nanostructured Platform

2021 ◽  
Author(s):  
Anees AHMAD Ansari ◽  
Manawwer Alam
Keyword(s):  
Cyclic Voltammetry ◽  
Impedance Spectroscopy ◽  
Transition Metal ◽  
Metal Ions ◽  
Cerium Oxide ◽  
Catalytic Properties ◽  
Transition Metal Ions ◽  
Oxygen Storage ◽  
Current Response ◽  
X Ray

Abstract Chemically synthesized cobalt-doped cerium oxide nanoparticles(CeO2:Co;NPs) were successfully prepared by complexed based co-precipitation process. The structural, morphological, chemical composition, optical properties, and electro-catalytic properties were determined by X-ray diffraction pattern(XRD), transmission electron microscopy(TEM), energy dispersive x-ray analysis (EDX), UV/Visible absorption spectroscopy, and cyclic voltammetry techniques. Owing to the wide-spread applications of CeO2 NPs in various fields of applied material sciences, transition metal ions doped CeO2:Co NPs exhibited excellent electro-catalytic properties. Outstanding physiochemical properties of CeO2 such as reversible oxidation states, high ionic mobility, large oxygen storage ability, effective large specific surface area, and the excellent current response observed in the electrocatalytic oxidation of hydrazine. The presence of transition metal ions (cobalt) improves the oxidation potential of hydrazine. Cyclic voltammetry was analog with the electrochemical impedance spectroscopy results, which revealed the enhanced with rapid sensing response against hydrazine. The electro-catalytic results of the CeO2:Co NPs electrode exhibited excellent voltammetry and impedance spectroscopy performance towards the hydrazine oxidation. The fabricated chemical sensor shows a wide linear detection range from 7.18 to 1000 µM, a low detection limit 7.2 µM, and sensitivity of 2.42 µAmLµM-1cm-2. The fabricated sensing electrode demonstrated long-term steadiness resulting it shows high sensitivity, selectivity, repeatability/reproducibility, and rapid detection of hydrazine.

scholarly journals Electrochromism and electrochemical properties of complexes of transition metal ions with benzimidazole-based ligand

RSC Advances ◽  
2017 ◽  
Vol 7 (80) ◽  
pp. 50858-50867 ◽  
Author(s):  
Monika Wałęsa-Chorab ◽  
Radosław Banasz ◽  
Damian Marcinkowski ◽  
Maciej Kubicki ◽  
Violetta Patroniak
Keyword(s):  
Optical Properties ◽  
Transition Metal ◽  
Metal Ions ◽  
Electrochemical Properties ◽  
Redox State ◽  
Transition Metal Ions ◽  
Ligand Molecule

Six complexes of transition metal ions have been synthesized and characterized. Complexes showed optical properties dependent on redox state of both metal ions and ligand molecule and can be used for the construction of multielectrochromic devices.

The electrochemical properties, nitrogen adsorption, and photocatalytic activities of three 3D metal–organic frameworks bearing the rigid terphenyl tetracarboxylates ligands

CrystEngComm ◽  
2016 ◽  
Vol 18 (17) ◽  
pp. 3086-3094 ◽  
Author(s):  
Bao Mu ◽  
Chang-Xia Li ◽  
Ming Song ◽  
Yan-Li Ren ◽  
Ru-Dan Huang
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Electrochemical Properties ◽  
Metal Organic Frameworks ◽  
Nitrogen Adsorption ◽  
Transition Metal Ions ◽  
Photocatalytic Activities ◽  
Metal Organic

Three new 3D complexes derived from the rigid terphenyl tetracarboxylates ligands with different transition metal ions have been successfully prepared. In addition, the title complexes exhibit different properties.

Sign in / Sign up

Export Citation Format

Share Document