Réduction électrochimique de dérivés carbonylés en milieu non aqueux en présence de EuCl3•6H2O

1987 ◽  
Vol 65 (3) ◽  
pp. 549-556 ◽  
Author(s):  
Jamaâ Douch ◽  
Guy Mousset
Keyword(s):  
Electrochemical Reduction ◽  
Ligand Exchange ◽  
Water Molecules ◽  
Nonaqueous Solvent ◽  
Aromatic Ketones ◽  
Voltammetric Study ◽  
Electrode Interface

The electrochemical reduction of aromatic or α,β ethylenic aromatic ketones in nonaqueous solvent (DMF) has been performed in the presence of EuCl3•6H2O. Ligand exchange between DMF and water molecules of the europium salt was first studied. A voltammetric study shows that complexation involving electrogenerated Eu(II) and ketone may occur at the electrode interface or in solution, leading respectively to [Formula: see text] and [Formula: see text] stoichiometries. The stereochemistry of hydrodimerization products is studied.

A first-principles study of the atomic layer deposition of ZnO on carboxyl functionalized carbon nanotubes: the role of water molecules

2021 ◽  
Vol 23 (5) ◽  
pp. 3467-3478
Author(s):  
J. I. Paez-Ornelas ◽  
H. N. Fernández-Escamilla ◽  
H. A. Borbón-Nuñez ◽  
H. Tiznado ◽  
Noboru Takeuchi ◽  
...  
Keyword(s):  
First Principles ◽  
Ligand Exchange ◽  
Functional Group ◽  
Atomic Layer ◽  
High Reactivity ◽  
Water Molecules ◽  
Exchange Reactions ◽  
Layer Deposition ◽  
The Right

Atomic description of ALD in systems that combine large surface area and high reactivity is key for selecting the right functional group to enhance the ligand-exchange reactions.

A cyclic voltammetric study of the proton abstraction from selected aromatic ketones by superoxide

2000 ◽  
Vol 45 (13) ◽  
pp. 2049-2059 ◽  
Author(s):  
Christina M Collins ◽  
Chariklia Sotiriou-Leventis ◽  
Maria T Canalas ◽  
Nicholas Leventis
Keyword(s):  
Cyclic Voltammetric ◽  
Aromatic Ketones ◽  
Proton Abstraction ◽  
Cyclic Voltammetric Study ◽  
Voltammetric Study

Ligand-exchange mechanism: new insight into solid-phase extraction of uranium based on a combined experimental and theoretical study

2015 ◽  
Vol 17 (11) ◽  
pp. 7214-7223 ◽  
Author(s):  
Yin Tian ◽  
Jia Fu ◽  
Yi Zhang ◽  
Kecheng Cao ◽  
Chiyao Bai ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Ligand Exchange ◽  
Theoretical Study ◽  
Solid Phase ◽  
Exchange Process ◽  
Water Molecules ◽  
Phase Extraction ◽  
Extraction Mechanism ◽  
Coordinated Water ◽  
Insight Into

The extraction mechanism is an exchange process between the ligands on Urea-GO and the coordinated water molecules of uranyl.

Electrochemical reduction of aromatic ketones in 1-butyl-3-methylimidazolium-based ionic liquids in the presence of carbon dioxide: the influence of the ketone substituent and the ionic liquid anion on bulk electrolysis product distribution

2015 ◽  
Vol 17 (29) ◽  
pp. 19247-19254 ◽  
Author(s):  
Shu-Feng Zhao ◽  
Mike Horne ◽  
Alan M. Bond ◽  
Jie Zhang
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Electrochemical Reduction ◽  
Product Distribution ◽  
Aromatic Ketone ◽  
Aromatic Ketones ◽  
Bulk Electrolysis ◽  
Electrolysis Product

The yield of electrocarboxylation of aromatic ketone depends on the imidazolium-based ionic liquid anion and the ketone substituent.

{Co(H2O)2[C6(COO)6]}n4n— — Ein neuartiges kettenförmiges Polyanion in Co3[C6(COO)6]·18H2O (Tricobalt(II)mellitat Octadecahydrat) / {Co(H2O)2[C6(COO)6]}n4n— – A Novel Chain-Like Polyanion in Co3[C6(COO)6]·18 H2O (Tricobalt(II) Mellitate Octadeca Hydrate)

1991 ◽  
Vol 46 (9) ◽  
pp. 1188-1192 ◽  
Author(s):  
Christian Robl ◽  
Stephanie Hentschel
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Ligand Exchange ◽  
Negative Charge ◽  
Water Molecules ◽  
Carboxylate Oxygen ◽  
Deep Blue ◽  
Carboxylate Groups ◽  
Excess Negative Charge ◽  
Oxygen Atoms

Red orthorhombic single crystals of Co3[C6(COO)6]·18 H2O were grown in aqueous silica gel (space group Pbca, a = 852.7(2), b = 2015.6(3), c = 1712.3(3) pm, 269 parameters, 2675 reflections, Rg = 0.0217). The Co2+ ions are coordinated octahedrally by water molecules and oxygen atoms of carboxylate groups. Co(1) is bound to five water molecules and one carboxylate oxygen atom, Co(2) is situated on a crystallographic center of symmetry and coordinated by four carboxylate oxygen atoms and two water molecules. Folded chains extending parallel to [100] made up by Co(2) and mellitate hexaanions with composition {Co(H2O)2[C6(COO)6]}n4n— are the main feature of the crystal structure. The excess negative charge is compensated for by Co(1) cations bound to these chains via carboxylate groups related by a center of symmetry. Hydrogen bonds connect neighbouring chains primarily with carboxylate oxygen atoms which are not bound to Co2+ as the proton acceptors. Endothermic loss of water was observed to commence at 120 °C, followed (in air) by a further exothermic two step decomposition at 370 and 450 °C to yield Co3O4 as a crystalline residue. With (CH3)2SO a topotactical ligand exchange occurs without destruction of the single crystals causing the colour of the compound to change to deep-blue.

Electrochemical Reduction of Aromatic Ketones in N,N-Dimethylformamide Containing Benzoic Acid. Effect of the Basicity of the Carbonyl Group

1988 ◽  
Vol 41 (12) ◽  
pp. 1963 ◽  
Author(s):  
B Kwiatek ◽  
MK Kalinowski
Keyword(s):  
Benzoic Acid ◽  
Electrochemical Reduction ◽  
Carbonyl Group ◽  
Carbonyl Compound ◽  
Double Layer ◽  
Linear Correlation ◽  
Acidity Constant ◽  
Polarographic Reduction ◽  
Aromatic Ketones ◽  
Acid Effect

The effect of benzoic acid on the polarographic reduction of a series of aromatic ketones in N,N- dimethylformamide has been investigated. In the presence of this acid a new cathodic wave (pre-wave) appears at more positive potentials than the original (orig.) wave of the reactant. A linear correlation has been found between ΔE½ and the pKBH+ values, where ΔE½ = E½ pre.wave -E½orig.wave and pKBH+ stands for the negative logarithm of the acidity constant of the protonated ketone . It is concluded that the pre-wave is associated with the cathodic reduction of a hydrogen-bonded adduct of 1 : 1 type formed between the carbonyl compound and the acid in the double layer. The effect of the double layer on the basicity of the ketones is discussed.

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