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.

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.

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 Keggin-Type Heteropoly Salts as Bifunctional Catalysts in Aerobic Baeyer-Villiger Oxidation

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1208 ◽  
Author(s):  
Katarzyna Pamin ◽  
Jan Połtowicz ◽  
Mateusz Prończuk ◽  
Joanna Kryściak-Czerwenka ◽  
Robert Karcz ◽  
...  
Keyword(s):  
Oxidation Mechanism ◽  
Decomposition Reaction ◽  
Redox Properties ◽  
Lewis Acidity ◽  
Bifunctional Catalysts ◽  
X Ray ◽  
Ethanol Decomposition ◽  
Iron Salts ◽  
First Time ◽  
Villiger Oxidation

The cobalt, manganese, and iron salts of tungstophosphoric or molybdophosphoric acid with growing content of metals were applied for the first time as catalysts in the Baeyer-Villiger (BV) oxidation of cyclohexanone to ε-caprolactone with molecular oxygen. The catalysts were characterized with Fourier transform infrared spectroscopy (FTIR), X-ray fluorescence (XRF), and ethanol decomposition reaction. Introduction of transition metals into the heteropoly structure increases the activity of resulting heteropoly salts in comparison with parent heteropolyacids. It was shown that the most active catalysts are salts of the heteropoly salts with one metal atom introduced and one proton left (HMPX) type, (where M = Co, Fe, Mn, and X = W, Mo) with the metal to proton ratio equal one. Among all of the studied catalysts, the highest catalytic activity was observed for HCoPW. The effect indicates that both the acidic and redox properties are required to achieve the best performance. The Baeyer-Villiger (BV) oxidation mechanism proposed identifies the participation of heteropoly compounds in three steps of the investigated reaction: oxidation of aldehyde to peracid (redox function), activation of carbonyl group (Lewis acidity), and decomposition of the Criegee adduct to ε-caprolactone (Brønsted acidity).

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

scholarly journals Le nitrate double NaRb2(NO3)3, composé intermédiaire du système binaire isobare NaNO3+ RbNO3: études thermiques et cristallographiques

2015 ◽  
Vol 71 (5) ◽  
pp. 455-458 ◽  
Author(s):  
Nesrine Ksiksi ◽  
Mohamed Driss ◽  
Dalila Hellali ◽  
Abderrahmen Guesmi ◽  
Hmida Zamali
Keyword(s):  
Atmospheric Pressure ◽  
Intermediate Compound ◽  
Oxidation States ◽  
Site Symmetry ◽  
Dsc Analysis ◽  
Distribution Method ◽  
Oxygen Coordination ◽  
Allotropic Form ◽  
Bond Valence Sum ◽  
First Time

Crystallographic and thermodynamic investigations of the binary (NaNO3+ RbNO3) phase diagram at atmospheric pressure reveal the existence of an intermediate compound NaRb2(NO3)3(sodium dirubidium trinitrate) previously predicted and now reported experimentally for the first time. According to a DSC analysis, the compound exhibits three allotropic forms. In its low-temperature allotropic form (α form, orthorhombic) there are two Rb (m.. site symmetry) and one Na (m..) independent crystallographic positions and three planar nitrate groups. The bond-valence-sum calculations for all atoms agree well with their oxidation states. The Rb cations are located in the (100) plane atx= ½ with 11 oxygen coordination. The Na ones are in the same plane atx= 0 and are coordinated to eight O atoms from six nitrate groups. The charge-distribution method has been used to evaluate the degree of distortion of the alkali polyhedra.

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

Electrochemical and spectral properties of tris[tetra(15-crown-5)phthalocyaninato]dilutetium(III)

2005 ◽  
Vol 09 (01) ◽  
pp. 1-6 ◽  
Author(s):  
Igor V. Zhukov ◽  
Lyudmila A. Lapkina ◽  
Yuliya G. Gorbunova ◽  
Vladimir E. Larchenko ◽  
Aslan Yu. Tsivadze
Keyword(s):  
Cyclic Voltammetry ◽  
Spectral Properties ◽  
Redox Properties ◽  
X Ray ◽  
H Nmr ◽  
Nmr Data ◽  
Physicochemical Studies ◽  
First Time

Tris[tetra(15-crown-5)phthalocyaninato]dilutetium(III) ( R 4 Pc )3 Lu 2, whose structure had been confirmed earlier by X-ray analysis, was further examined by physicochemical studies. The redox properties of this complex were investigated by cyclic voltammetry. The spectroelectrochemical study of this compound has been performed for the first time. Based on the results obtained and analysis of literature data, an electrochemical criterion related to double- and triple-decker structure of lanthanide phthalocyanines has been proposed. IR and 1 H NMR data are also reported.

Volatility studies of metal chelates. II. Gas chromatographic properties of vanadium β-diketonates

1976 ◽  
Vol 29 (11) ◽  
pp. 2381 ◽  
Author(s):  
S Dilli ◽  
E Patsalides
Keyword(s):  
Liquid Chromatography ◽  
Stationary Phase ◽  
Oxidation States ◽  
Electron Capture Detection ◽  
Gas Liquid Chromatography ◽  
Ionization Detector ◽  
Flame Ionization ◽  
First Time ◽  
Chromatographic Elution ◽  
Polar Stationary Phase

The gas chromatographic elution behaviour is reported for a total of 16 vanadium(111) and oxovanadium(1V) fluorinated β-diketonates on a column consisting of a lightly loaded, non-polar stationary phase and diatomite support. The superiority of the vanadium(111) chelates is shown to include electron-capture detection. Detection limits of 14 chelates are given for the flame ionization detector. Separation of the two oxidation states of a metal by gas-liquid chromatography is demonstrated for the first time.

scholarly journals Speciation of Rhenium in Chloride Melts: Spectroscopic and Electrochemical Study

2008 ◽  
Vol 63 (5-6) ◽  
pp. 371-376 ◽  
Author(s):  
Danil A. Danilov ◽  
Vladimir A. Volkovich ◽  
Boris D. Vasin ◽  
Denis E. Aleksandrov ◽  
Ilya B. Polovov ◽  
...  
Keyword(s):  
Molten Salts ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Oxidation States ◽  
Alkali Chloride ◽  
Chloride Melts ◽  
Current Densities ◽  
Alkali Chlorides ◽  
First Time ◽  
Kinetics Of

Speciation of rhenium in high-temperature alkali chloride-based melts was studied using electronic absorption and IR spectroscopy of molten salts and diffuse reflectance spectroscopy of quenched melts. Rhenium was added to the melts by anodic dissolution of the metal (at anodic current densities of 0.005 - 0.05 A/cm2), by reacting Re and ReO2 with Cl2 and HCl, and by dissolving K2[ReCl6]. The melts included 3LiCl-2KCl and NaCl-2CsCl eutectics, an NaCl-KCl equimolar mixture, and pure NaCl, KCl and CsCl between 450 and 850 ◦C. Rhenium was present in the melts as Re(IV) hexachloro-ions, [ReCl6]2−; no evidence of species containing rhenium in oxidation states below four was obtained. The kinetics of [ReCl6]2− disproportionation in molten alkali chlorides were investigated, and the IR spectra of [ReO4]− ions in molten CsCl-CsI and CsI were measured for the first time.

Large-Scale Synthesis of Aniline Trimers in Different Oxidation States

Synthesis ◽  
2019 ◽  
Vol 51 (19) ◽  
pp. 3611-3616
Author(s):  
Gerardo Yepez ◽  
Anurag Noonikara Poyil ◽  
Alejandro Bugarin
Keyword(s):  
Organic Compounds ◽  
Large Scale ◽  
Oxidation States ◽  
Important Class ◽  
Large Scale Synthesis ◽  
Synthetic Approaches ◽  
First Time

Polyanilines are an important class of organic compounds, due to their utility in a large variety of applications. In contrast, oligo­anilines have been employed far more sporadically, in large part reflecting an absence of refined synthetic approaches. Herein, we report, for the first time, a relatively large-scale strategy to generate highly pure aniline trimers at different oxidation states with excellent yields (90–97%).

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