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Books > Science & Mathematics > Biology, life sciences > Biochemistry
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Mixed Valency Systems: Applications in Chemistry, Physics and Biology (Paperback, Softcover reprint of the original 1st ed. 1991)
Loot Price: R5,627
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Mixed Valency Systems: Applications in Chemistry, Physics and Biology (Paperback, Softcover reprint of the original 1st ed. 1991)
Series: NATO Science Series C, 343
Expected to ship within 10 - 15 working days
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Mixed valency is one of various names used to describe compounds
which contain ions of the same element in two different formal
states of oxidation. The existence of mixed valency systems goes
far back into the geological evolutionary history of the earth and
other planets, while a plethora of mixed valency minerals has
attracted attention since antiquity. Indeed, control of the
oxidation states of Fe in its oxides (FeO, Fe304' Fe203) was
elegantly used in vase painting by the ancient Greeks to produce
the characteristic black and red Attic ceramics (Z. Goffer,
"Archaeological Chemistry," Wiley, New York, 1980). It was,
however, only 25 years ago that two reviews of mixed valency
appeared in the literature almost simultaneously, signalling the
first attempt to treat mixed valency systems as a separate class of
compounds whose properties can be correlated with the molecular and
the electronic structure of their members. Then mixed valency
phenomena attracted the interest of disparate classes of
scientists, ranging from synthetic chemists to solid state
physicists and from biologists to geologists. This activity
culminated with the NATO ASI meeting in Oxford in 1979. The 1980's
saw again a continuing upsurge of interest in mixed valency. Its
presence is a necessary factor in the search for highly conducting
materials, including molecular metals and superconductors. The
highly celebrated high T c ceramic superconducting oxides are
indeed mixed valency compounds.
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