X-ray and Solution Structures of CuIIGHK and CuIIDAHK Complexes: Influence on Their Redox Properties

2011 ◽  
Vol 17 (36) ◽  
pp. 10151-10160 ◽  
Author(s):  
Christelle Hureau ◽  
Hélène Eury ◽  
Régis Guillot ◽  
Christian Bijani ◽  
Stéphanie Sayen ◽  
...  
Keyword(s):  
Redox Properties ◽  
X Ray ◽  
Solution Structures

ChemInform Abstract: Synthesis, X-Ray Crystal Structure, and Multistage Redox Properties of a Severely-Distorted Tetrathiafulvalene Donor.

ChemInform ◽  
2010 ◽  
Vol 23 (26) ◽  
pp. no-no
Author(s):  
M. R. BRYCE ◽  
M. A. COFFIN ◽  
M. B. HURSTHOUSE ◽  
A. I. KARAULOV ◽  
K. MUELLEN ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Redox Properties ◽  
X Ray

Crystal Structure, Spectroscopic and Redox Properties of Copper(II) Bis{2-[(2,6-dimethylphenyl)iminomethyl-3-methoxyphenolate]}

2007 ◽  
Vol 62 (9) ◽  
pp. 1133-1138 ◽  
Author(s):  
Veli T. Kasumov ◽  
Ibrahim Uçar ◽  
Ahmet Bulut ◽  
Fevzi Kösal
Keyword(s):  
Crystal Structure ◽  
Title Complex ◽  
Redox Properties ◽  
Orthorhombic Space Group ◽  
Long Distance ◽  
X Ray ◽  
X Ray Crystallography ◽  
Square Planar ◽  
Planar Molecules ◽  
Exchange Interaction Parameter

The coordination chemistry of N-(2,6-di-methylphenyl)-2-hydroxy-3-methoxybenzaldimine (1) with Cu(II) has been investigated by X-ray crystallography, electronic and EPR spectroscopies, as well as by electro- and magnetochemistry. The title complex 2 crystallizes in the orthorhombic space group P212121 (a = 8.1538, b = 17.7466, c =19.8507 Å). The mononuclear square-planar molecules 2 featuring trans-N2O2 coordination are connected via weak intermolecular C-H· · ·π interactions into infinite chains parallel to the a axis. Although the intermolecular Cu· · ·Cu separations within individual chains and between chains are very long (8.154 and 9.726 Å ), the exchange interaction parameter G = 2.03 < 4, estimated from solid state EPR spectra, suggests the existence of long-distance superexchange pathways between adjacent Cu(II) centers. The electronic and electrochemical features of the compound are also discussed.

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).

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