American chemist who in 1983 won the Nobel Prize for Chemistry for
his extensive research into the properties and reactions of dissolved
inorganic substances, particularly oxidation-reduction processes involving
the ions of metallic elements.
In the late 1940s Taube carried out experiments with isotopes to show that in water solution the ions of metals form chemical bonds with several molecules of water and that the stability and geometric arrangement of the resulting hydrates, or coordination compounds, vary widely, depending on the identity and oxidation state of the ion. He also helped develop other techniques for studying such substances, and he devised an interpretation of their properties in terms of their electronic configurations. Analogous coordination compounds form in the presence of ammonia, chloride ion, or numerous other chemical species, which are called ligands when they engage in these reactions.
The oxidation or reduction of one metal ion by another involves their
exchange of one or more electrons. Many such reactions occur rapidly
in aqueous solution despite the fact that the stable shells of water
molecules or other ligands should keep the two ions from getting close
enough for electron exchange to occur directly. Taube showed that, in
an intermediate stage of the reaction, a chemical bond must form between
one of the ions and a ligand that is still bonded to the other. This
ligand acts as a temporary bridge between the two ions, and its bond
to the original ion can later break in such a way as to effect--indirectly--the
electron transfer that completes the reaction. Taube's findings have
been applied in selecting metallic compounds for use as catalysts, pigments,
and superconductors and in understanding the function of metal ions
as constituents of certain enzymes.
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