The Stabilization of MN (I) and MN (II) Oxidation States by the Formation of Coordination Compounds
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Authors
Urzendowski, M. Rosalie O.S.F.
Issue Date
1960
Volume
Issue
Type
Thesis
Language
en_US
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Abstract
A careful examination of the literature shows that manganese exhibits striking variations in valency, (1,2,3,4,6, and 7), and in each stage there are well-defined coordination compounds. |Although there are a large series of bivalent manganese compounds, in general, the Mn+2 ion exhibits a weak tendency to fom complexes, or coordination compounds, as they are so-called. Kossel suggested that this was the result of the charge to size ratio of the ions, for, from a consideration of electrostatic data, he pointed out that a metal with a high ionic charge and a small ionic radius would form coordination compounds of the greatest stability. De, working independently, suggested that metals which have the greatest coordinating ability are those of small atomic volume, thus of small ionic radius. Cartledge reported that coordinating ability increases with an increase in the ionic potential of the central ion. Ionic potential is defined as the charge of the ion divided by its crystal radius. Irving and Williams have summarized the results of numerous investigators concerning the stability data of the first transition series. They found that regardless of the nature of the donor group, the so-called natural order of the stability of complexes of the bivalent metal is Mn<Fe<Co<Ni<Cu>Zn.
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Creighton University
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