poster and abstract

LUBELSKI ODDZIAŁ
POLSKIEGO TOWARZYSTWA CHEMICZNEGO
serdecznie zaprasza wszystkich zainteresowanych
na wykład
Prof. Carlosa D. Bravo-Diaz
Universidad De Vigo, Facultad De Quimica, Departamento De Química
Fisica
As Lagoas-Marcosende, 36200 Vigo, Spain
zatytułowany
“ARENEDIAZONIUM IONS: CHEMICAL
PROBES OF THE INTERFACIAL
COMPOSITION OF COLLOIDAL
SYSTEMS”
Wykład odbędzie się we wtorek
11 maja 2010 o godzinie 12.00
w sali M, Mała Chemia
Pl. M.C.Skłodowskiej 2.
prof. Anna Deryło-Marczewska
(Przewodnicząca Lubelskiego Oddziału PTChem)
ABSTRACT
Arenediazonium, ArN2+, ions are important in preparative and synthetic chemistry and became
industrially significant after Griess discovered the azo-coupling reaction, i.e. replacement of an
electrofugic atom or group at a nucleophilic carbon atom by an ArN2+ ion. In addition to the well-known
applications in synthetic and azo dye chemistry, new and interesting uses are emerging, e.g. they are
currently being used to modify carbon surfaces, to probe interfacial compositions of colloidal aggregates
and their role in mutagenic and carcinogenic processes is being investigated.
This talk will focus on their applications rather than in their chemistry and will show some examples of
the use of arenediazonium, ArN2+ , ions as chemical probes focusing on three applications:
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To monitor alcohol induced micelle breakdown by chemical trapping.
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To determine association constants of aryl radicals to micellar and macromolecular systems.
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To determine antioxidant distributions in food-grade emulsions.
For the purpose, several techniques can be used, but stress on the use and applications of electrochemical
methods will be given, which has been proved as a powerful and versatile tool to monitor ArN2+ ions.
Figure: Monitoring ArN2+ loss and formation of an O-adduct in the course of the reaction between 4hexadecylbenzenediazonium ions and ascorbic acid in octane-based emulsions.