Books > Science & Mathematics > Chemistry > Analytical chemistry
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Wolfgang Kaim, Axel Klein; Contributions by Stephen Best, A.L. Crumbliss, Lothar Dunsch, Masa-Aki Haga, Frantisek Hartl, C.P. Kubiak, R. Winter, L.J. Yellowlees
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Electrochemistry affects several relevant research subjects of
physics, chemistry and biology such as the transformation of
materials, the transfer of information (especially in living
systems), or the conversion and storage of energy. In addition,
electrochemical processes constitute a major class of chemical
reactions both in the laboratory and on large industrial scales.
While conventional analytical electrochemistry provides excellent
methods to determine concentrations (e.g. in sensor technology), to
yield energy data in the form of redox potentials and to elucidate
formal reaction mechanisms via kinetic analysis, these techniques
alone are often not immediately suitable to identify unknown
species which are formed as intermediates or as products in a redox
reaction. The combination of reaction-oriented electrochemistry
with species-focussed spectroscopy in spectroelectrochemistry can
solve this problem and thus allow for a more complete analysis of
electron transfer processes and complex redox reactions. Many
research groups from various sub-fields of the chemical sciences
have engaged in recent years in using and developing this combined
methodology. While the technique has been well developed during the
last few decades, its application in various fields of chemistry
has only recently become more widespread. Readily accessible,
inexpensive equipment and lower barriers to application have
contributed to this situation and, at the same time, it is becoming
less and less acceptable in chemical research to assign redox
transformations without spectral evidence. Spectroelectrochemistry
has therefore evolved as a powerful yet usually inexpensive
technique which yields mechanistic (chemistry), energy-relevant
(electro) as well as electronic structure information (spectro).
The whole range of the electromagnetic spectrum can be employed
from x-ray absorption to NMR spectroscopies. Yet while the method
has become more commonplace, there are still aspects to be
considered which require sound knowledge and experience. This book
serves as a guide and as an illustration of the kind of research
where spectroelectrochemistry can make a difference in the
understanding of redox reactions through identification of their
intermediates and products. Relevant examples involving UV-VIS-NIR
and IR absorption spectroscopy as well as electron paramagnetic
resonance (EPR) are presented in this book with the objective to
illustrate the potential and the applications of this technique and
to provide practical information. The topics covered include: "
organometallics " coordination compounds (mixed-valent complexes,
metalloporphyrins) " compounds of biochemical interest such as
iron-containing proteins The breadth and variety of reactions and
materials covered are complemented by the straightforward
interpretation of results in the understanding of redox reactions.
The solutions available from the spectroelectrochemical
investigation in the book do not only provide simultaneous reaction
analysis and species identification but also an assessment of
electronic situations and of intra- and intermolecular electron
transfer. The book aims to familiarise the scientific community
with this method by describing the experimental approaches possible
and by pointing out under what diverse circumstances this technique
can be useful. This book is essential reading for experts and
newcomers alike to acquaint themselves with this simple,
inexpensive, yet powerful method and it will also appeal to
scientists from all chemical sub-fields who have a basic
understanding and experience in electrochemistry.
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