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Cover Picture: Redox Chemistry of Actinide Ions in Wells−Dawson Heteropolyoxoanion Complexes (Eur. J. Inorg. Chem. 16/2003)
Author(s) -
Chiang MingHsi,
Soderholm L.,
Antonio Mark R.
Publication year - 2003
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200390233
Subject(s) - chemistry , redox , xanes , actinide , electrochemistry , ion , inorganic chemistry , nernst equation , crystallography , organic chemistry , spectral line , electrode , physics , astronomy
The cover picture shows the multi‐faceted approach required to unravel the complicated electrochemistry presented by Wells−Dawson coordinated actinide ( An ) ions, [ An (α‐2‐P 2 W 17 O 61 ) 2 ] n− ( An = Th, U, Np, Pu, Am). These An ‐polyoxometalate (POM) clusters contain two redox centers: the central An ion (magenta), except Th 4+ , and the ligands, (α‐2‐P 2 W 17 O 61 ) 10− , for which P is orange, W is black, and O is teal blue. The formal potentials of the An ions are extracted by in situ XANES (X‐ray absorption near edge structure) spectroelectrochemistry, using the Nernst formalism. This approach provides a unique avenue to quantifying the An redox response, because the multi‐redox active centers, together with the deep blue color of the ligands upon reduction, exclude more standard experiments. The Nernst approach to XANES data provides information about the electronic influence of POM complexation, which is of fundamental interest as related to correlated electron behavior and of practical significance to separations science in nuclear waste processing. Details are presented in the article by M.‐H. Chiang, L. Soderholm and M. R. Antonio on p. 2929 ff.