Cobaltacycles in three oxidation states: redox properties and reaction routes

1987 ◽  
Vol 6 (7) ◽  
pp. 1432-1439 ◽  
Author(s):  
Richard S. Kelly ◽  
William E. Geiger
Keyword(s):  
Redox Properties ◽  
Oxidation States ◽  
Reaction Routes

scholarly journals Synthesis, Structure, and Redox Properties of a trans-Diaqua Ru Complex That Reaches Seven-Coordination at High Oxidation States

2017 ◽  
Vol 57 (4) ◽  
pp. 1757-1765 ◽  
Author(s):  
Roc Matheu ◽  
Jordi Benet-Buchholz ◽  
Xavier Sala ◽  
Antoni Llobet
Keyword(s):  
Redox Properties ◽  
Oxidation States ◽  
Ru Complex ◽  
High Oxidation

The Distribution of Iron Oxidation States in a Constructed Wetland as an Indicator of Its Redox Properties

2006 ◽  
Vol 3 (12) ◽  
pp. 1288-1300 ◽  
Author(s):  
Kateřina Diáková ◽  
Veronika Holcová ◽  
Jan Šíma ◽  
Jiří Dušek
Keyword(s):  
Constructed Wetland ◽  
Iron Oxidation ◽  
Redox Properties ◽  
Oxidation States ◽  
Iron Oxidation States

Accessing three oxidation states of cobalt in M6L3 nanoprisms with cobalt–porphyrin walls

2021 ◽  
Author(s):  
P. Thomas Blackburn ◽  
Iram F. Mansoor ◽  
Kaitlyn G. Dutton ◽  
Alexei M. Tyryshkin ◽  
Mark C. Lipke
Keyword(s):  
Redox Properties ◽  
Oxidation States ◽  
Cobalt Porphyrin ◽  
First Time

Pt2+-linked M6L3 nanoprisms with cobalt–porphyrin walls were prepared and their redox properties were evaluated, leading to the first time that cobalt–porphyrin nanocages have been characterized in CoI, CoII, and CoIII states.

Redox switchable 19π and 18π 5,10,20-triaryl-5,15-diazaporphyrinoid–nickel(II) complexes

2018 ◽  
Vol 22 (07) ◽  
pp. 542-551 ◽  
Author(s):  
Keisuke Sudoh ◽  
Takuroh Hatakeyama ◽  
Ko Furukawa ◽  
Haruyuki Nakano ◽  
Yoshihiro Matano
Keyword(s):  
Magnetic Properties ◽  
Redox Properties ◽  
Oxidation States ◽  
Net Charge ◽  
H Nmr ◽  
New Class ◽  
Aromatic Character ◽  
Delocalized Electron ◽  
Homo And Lumo ◽  
The Difference

The synthesis and optical, electrochemical, and magnetic properties of nickel(II) complexes of 5,10,20-triaryl-5,15-diazaporphyrin (TriADAP) are reported. Metal-templated cyclization of unsymmetrically substituted nickel(II)–bis(1-amino-9-chloro-5-mesityldipyrrin; mesityl = 2,4,6-trimethylphenyl) complexes afforded the corresponding TriADAPs or 5-aryl-15-benzyl-10,20-dimesityl-5,15-diazaporphyrin, depending on the combination of base and solvent. The latter macrocycle was converted to TriADAP by deprotection of the [Formula: see text]-benzyl group through Pd/C-promoted hydrogenation. TriADAPs were isolated in both 18[Formula: see text] (cation) and 19[Formula: see text] (neutral) forms. The interconversion between these two oxidation states resulted in a distinct change in the optical properties of the DAP [Formula: see text]-system. NMR spectroscopy of the 18[Formula: see text] TriADAP cations showed that they had aromatic character, whereas EPR spectroscopy of the 19[Formula: see text] TriADAP showed a highly delocalized electron spin of the [Formula: see text]-radical. The para substituents of the [Formula: see text]-aryl groups of TriADAPs had a small but distinct impact on their HOMO and LUMO energies. The change in the net charge of one electron was directly reflected in the redox properties of the DAP ring; TriADAP was more easily reduced and less easily oxidized than DAP. The difference in the net charge was also reflected by the shielding of the pyrrolic [Formula: see text]-protons observed in the [Formula: see text]H NMR spectra. The present results confirm that TriADAP is a highly promising framework for constructing a new class of azaporphyrin-based materials with 18[Formula: see text]–19[Formula: see text] redox-switchable optical and magnetic properties.

Ruthenium complexes in different oxidation states: synthesis, crystal structure, spectra and redox properties

2013 ◽  
Vol 42 (17) ◽  
pp. 6092 ◽  
Author(s):  
Agnieszka Jabłońska-Wawrzycka ◽  
Patrycja Rogala ◽  
Sławomir Michałkiewicz ◽  
Maciej Hodorowicz ◽  
Barbara Barszcz
Keyword(s):  
Crystal Structure ◽  
Ruthenium Complexes ◽  
Redox Properties ◽  
Oxidation States

scholarly journals Accessing Three Oxidation States of Cobalt in M6L3 Nanoprisms with Cobalt-Porphyrin Walls

2021 ◽  
Author(s):  
P. Thomas Blackburn ◽  
Iram F. Mansoor ◽  
Kaitlyn G. Dutton ◽  
Alexei M. Tyryshkin ◽  
Mark C. Lipke
Keyword(s):  
Redox Properties ◽  
Oxidation States ◽  
Cobalt Porphyrin ◽  
Redox Active ◽  
First Time

Nanocages with porphyrin walls are common, but studies of such structures hosting redox-active metals are rare. Pt-linked M6L3 nanoprisms with cobalt-porphyrin walls were prepared and their redox properties were evaluated electrochemically and chemically, leading to the first time that cobalt-porphyrin nanocages have been characterized in Co(I), Co(II), and Co(III) states.

MicroEXAFS study into the oxidation states of copper coloured Hispano-Moresque lustre decorations

2003 ◽  
Vol 104 ◽  
pp. 519-522 ◽  
Author(s):  
A. D. Smith ◽  
T. Pradell ◽  
J. Molera ◽  
M. Vendrell ◽  
M. A. Marcus ◽  
...  
Keyword(s):  
Oxidation States

Acceptorless amine dehydrogenation and transamination using Pd-doped layered double hydroxides

2018 ◽  
Author(s):  
Diana Ainembabazi ◽  
Nan An ◽  
Jinesh Manayil ◽  
Kare Wilson ◽  
Adam Lee ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Oxidation States ◽  
Secondary Amines ◽  
Primary Amines ◽  
Acid Dissolution ◽  
Oxidative Amination ◽  
Strong Function ◽  
Excellent Activity ◽  
High Yields ◽  
Double Hydroxides

<div> <p>The synthesis, characterization, and activity of Pd-doped layered double hydroxides (Pd-LDHs) for for acceptorless amine dehydrogenation is reported. These multifunctional catalysts comprise Brønsted basic and Lewis acidic surface sites that stabilize Pd species in 0, 2+, and 4+ oxidation states. Pd speciation and corresponding cataytic performance is a strong function of metal loading. Excellent activity is observed for the oxidative transamination of primary amines and acceptorless dehydrogenation of secondary amines to secondary imines using a low Pd loading (0.5 mol%), without the need for oxidants. N-heterocycles, such as indoline, 1,2,3,4-tetrahydroquinoline, and piperidine, are dehydrogenated to the corresponding aromatics with high yields. The relative yields of secondary imines are proportional to the calculated free energy of reaction, while yields for oxidative amination correlate with the electrophilicity of primary imine intermediates. Reversible amine dehydrogenation and imine hydrogenation determine the relative imine:amine selectivity. Poisoning tests evidence that Pd-LDHs operate heterogeneously, with negligible metal leaching; catalysts can be regenerated by acid dissolution and re-precipitation.</p> </div> <br>

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