Covalent Modification of Carbon Surfaces by Aryl Radicals Generated from the Electrochemical Reduction of Diazonium Salts

1997 ◽  
Vol 119 (1) ◽  
pp. 201-207 ◽  
Author(s):  
Philippe Allongue ◽  
Michel Delamar ◽  
Bernard Desbat ◽  
Olivier Fagebaume ◽  
Rachid Hitmi ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Covalent Modification ◽  
Diazonium Salts ◽  
Aryl Radicals ◽  
Carbon Surfaces

scholarly journals Covalent attachment of phenyl and carboxyphenyl layers derived from diazonium salts onto activated charcoal for the adsorption of pesticides

2018 ◽  
Vol 37 (1) ◽  
pp. 71 ◽  
Author(s):  
Jeton Halili ◽  
Fexhrie Salihu ◽  
Avni Riza Berisha
Keyword(s):  
Gas Chromatography ◽  
Organochlorine Pesticides ◽  
Activated Charcoal ◽  
Covalent Modification ◽  
Covalent Attachment ◽  
Steric Effects ◽  
Diazonium Salts ◽  
Aryl Radicals ◽  
The Past ◽  
Tentative Explanation

The past and recent uncontrolled use of organochlorine pesticides imposes serious problems due to their adverse undesired effects in ecosystems. Finding new ways to dispose of these molecules is therefore mandatory. The covalent modification of activated charcoal powder (ACP) by substituted aryl groups can be achieved by reaction with aryl radicals obtained through the sonically induced dediazonation of diazonium salts. Seventeen organochlorine pesticides were adsorbed on ACP covalently grafted with phenyl and carboxyphenyl layers. The sorption percentages of the pesticides onto the carboxyphenyl modified ACPs [measured by GC-ECD (Gas Chromatography – Electron Capture Detector)] were in the range of 90–100% (DDT, δ-HCH, γ-HCH and endrin aldehyde), 80–90% (methoxychlor, endosulfan II, p,p-DDD and β-HCH) and 60–80% (α-HCH, DDE, endosulfansulfate, endrin, endosulfan I, aldrin, heptachlorepoxid, dieldrin and heptachlor). A tentative explanation is given for these differences based on steric effects.

σ-Bond initiated generation of aryl radicals from aryl diazonium salts

2020 ◽  
Vol 18 (9) ◽  
pp. 1812-1819 ◽  
Author(s):  
Elene Tatunashvili ◽  
Bun Chan ◽  
Philippe E. Nashar ◽  
Christopher S. P. McErlean
Keyword(s):  
Room Temperature ◽  
Radical Reactions ◽  
Diazonium Salts ◽  
Aryl Radicals

Hantzsch esters and oxygen convert diazonium salts into aryl radicals, enabling rapid radical reactions to be performed in open flasks at room temperature.

Graftfast©: Towards the Control of Surface Properties of any Type of Materials by the Grafting of Polymers

2012 ◽  
Vol 445 ◽  
pp. 797-802 ◽  
Author(s):  
Alice Mesnage ◽  
Pardis Simon ◽  
Guy Deniau ◽  
Nathalie Herlin-Boime ◽  
Serge Palacin
Keyword(s):  
Surface Properties ◽  
Polymer Films ◽  
Atmospheric Pressure ◽  
Room Temperature ◽  
Diazonium Salts ◽  
Green Process ◽  
Graft Polymer ◽  
Grafted Polymer ◽  
Aryl Radicals ◽  
One Step

This document aims at presenting and explaining the mechanism of a simple green process, called Graftfast©, recently developed in order to graft polymer films onto any type of materials. This process is of great interest as it works in a short one step reaction at room temperature, atmospheric pressure in water. Particularly since this method is a redoxinduced process consisting in the reduction of diazonium salts into aryl radicals in presence of vinylic monomer, the involvement of such radicals was investigated. Moreover, this work demonstrates the efficiency of such process for the preparation of functionalized TiO2 nanoparticles. The composition and the grafted polymer quantities were investigated showing the successful grafting of the polymer onto the nanoparticles while conserving their morphology.

Electrografting of Alkyl Films at Low Driving Force by Diverting the Reactivity of Aryl Radicals Derived from Diazonium Salts

Langmuir ◽  
2014 ◽  
Vol 30 (46) ◽  
pp. 13907-13913 ◽  
Author(s):  
Dardan Hetemi ◽  
Frédéric Kanoufi ◽  
Catherine Combellas ◽  
Jean Pinson ◽  
Fetah I. Podvorica
Keyword(s):  
Driving Force ◽  
Diazonium Salts ◽  
Aryl Radicals

Covalent Modification of Iron Surfaces by Electrochemical Reduction of Aryldiazonium Salts

2001 ◽  
Vol 123 (19) ◽  
pp. 4541-4549 ◽  
Author(s):  
Alain Adenier ◽  
Marie-Claude Bernard ◽  
Mohamed M. Chehimi ◽  
Eva Cabet-Deliry ◽  
Bernard Desbat ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Covalent Modification
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