Spectroelectrochemistry infrared

Semiconductors. In Sections 2.4.1, 4.5 and 5.10.4 basic physical and electrochemical properties of semiconductors are discussed so that the present paragraph only deals with practically important electrode materials. The most common semiconductors are Si, Ge, CdS, and GaAs. They can be doped to p- or n-state, and used as electrodes for various electrochemical and photoelectrochemical studies. Germanium has also found application as an infrared transparent electrode for the in situ infrared spectroelectrochemistry, where it is used either pure or coated with thin transparent films of Au or C (Section 5.5.6). The common disadvantage of Ge and other semiconductors mentioned is their relatively high chemical reactivity, which causes the practical electrodes to be almost always covered with an oxide (hydrated oxide) film. [Pg.319]

BLACKWOOD ETAL. Infrared Spectroelectrochemistry of Surface Species 339... [Pg.339]

Curtis and Eisenstein355 have made a molecular orbital analysis of the regioselectivity of the addition of nucleophiles to 77-allyl complexes and on the conformation of the 773-allyl ligand in [MoX(CO)2L2(773-allyl)] type complexes. A detailed study of the chirality retention in rearrangements of complexes of the type [MX(CO)2(dppe)(rj3-C3H5)] has been made.356 Studies of the photoelectron spectra,357 electrochemical properties,358 infrared spectroelectrochemistry,359 and fast atom bombardment mass spec-... [Pg.96]

S. A. Ciniawsky, Infrared Spectroelectrochemistry of Coordination Compounds , PhD, University College London, London, 1992. [Pg.29]

The synthesis of this cluster provided the addition of the two acetyl IR chromophores to aid in characterisation of the reduced state. In the neutral state, this monomer contains three ruthenium atoms, one formally in the (+2) (bonded to CO) and two in the (+3) (bonded to acpy ligands) redox states. However, this formal description of the charge may not accurately represent the actual charge distribution over the cluster. Infrared spectroelectrochemistry was carried out on this monomer to determine whether the charge was in fact localised in this manner. [Pg.134]

Infrared spectroelectrochemistry of 5 and 6 reveals exchange pairs consistent with mixed-valence isomerism (Figure 5.20). In the case of 5 (Figure 5.20, left), the neutral and doubly reduced (—2) states each show two v(CO) bands, separated by ca. 90cm the intrinsic frequency separation due to the isotope substitution, v( C 0) vi. v( C 0). In the mixed valence (-1) state of 5, four v(CO) bands are observed, and these correspond (from higher to lower energy) to... [Pg.141]

Figure 5.20 Infrared spectroelectrochemistry of 5 (left) and 6 (right) at — 30°C in a 0.1 M tetra-w-butylammoniumhexafluorophospate solution in CH2CI2. Spectra for the neutral (top), charge-transfer (middle), and doubly reduced (bottom) states are shown with a schematic of the exchanging populations. A qualitative potential energy surface is depicted at the top.

Polarographic and cyclic voltammetric studies showed the formation of dianions, with one of the dianionic complexes exhibiting further chemical reactivity. Bulk electrolysis and infrared spectroelectrochemistry were used to confirm the decomposition of the dianionic tetranuclear clusters to stable tricobalt anions. [Pg.536]

The principles that govern infrared spectroelectrochemistry have been reported in a number of papers. This chapter highlights recent progress and discusses spectroscopic instrumentation and measurement concepts that have received little coverage in previous reports. Applications in the study of molecules on well-defined surfaces, bimetallic alloys, and nanoparticle catalysts are described. [Pg.233]

Support from the U.S. National Science Foundation for the author s work in the area of infrared spectroelectrochemistry is gratefully acknowledged. [Pg.263]

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