Electrochemical impendance spectroscopy: a useful tool to study conducting polymers and the electroreductive cleavage of carbon-halogen bond
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Data di Pubblicazione:
2013
Citazione:
Electrochemical impendance spectroscopy: a useful tool to study conducting polymers and the electroreductive cleavage of carbon-halogen bond / M. Magni, P. Mussini, S. Arnaboldi. ((Intervento presentato al convegno GEI Giornate dell’Elettrochimica Italiana tenutosi a Pavia nel 2013.
Abstract:
The electrochemical impedance spectroscopy (EIS) is a powerful and polyhedral
technique that can find application in many fields of scientific research; actually it can
be exploited for the study of practically any kind of electron transfer process.
Considering the EIS potentialities we employed the technique in two quite different
fields: the characterization of conducting organic polymers and the mechanistic study
of the electroreductive cleavage of carbon-halogen (C-X) bonds in non-catalytic and
catalytic conditions. We will present the main results of the thesis project.
The work focused on the conducting polymers was structured as follows: i) a
preliminary study focused on poly(4H-cyclopenta[3,2-b]dithiophene), poly-CPDT,
chosen as a conducting polymer model which made us able to understand the
behavior of these materials in different experimental conditions (see figure); ii) the
study of a very promising class of inherently chiral conducting polymers with a
particular attention to electrodeposited oligomeric films of 2,2’-bis(2,2’-bithiophen-5-
yl)-3,3’-bi-1-benzothiophene, applying EIS (in combination with cyclic voltammetry,
CV) in order to prove the enantiorecognition capability of its enantiopure films. A
further investigation was aimed to test EIS as an auxiliary and/or complementary
technique to CV in mechanistic electron transfer studies, applying it, for the first time,
to the investigation of the electroreductive cleavage of C-X bond in a series of aromatic
and heteroaromatic organic bromides, on non-catalytic GC, moderately catalytic Au,
and highly catalytic Ag electrode. EIS very nicely and neatly accounted for the
“orientation effect” of bromo-thiophenes on gold electrode surfaces by the anchoring
sulphur atom, affording to monitor the variation of the charge transfer resistance for
the C-Br bond cleavage on two ad-hoc chosen constitutional isomers (see figure).
Tipologia IRIS:
14 - Intervento a convegno non pubblicato
Elenco autori:
M. Magni, P. Mussini, S. Arnaboldi
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