ISSN:
1573-8779
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary 1. The electron absorption spectrum of Co2+ ions in aqueous solutions was investigated in the 230–1350 mμ region. 2. The electron absorption spectra of the following crystals were investigated with natural radiation in the 230–1350 mμ regions: Co(ClO4)2 · 6H2O, CoSO4 · 7H2O, CoCl2 · 6H2O, CoCl2 · 2H2O, CoCl2, CoBr2, Cs2CoCl4, CsCoBr5. Investigation of the same crystals with polarized radiation showed that their “pleochroism” reduces to “absorption.” 3. Changes in the chemical nature of the particles surrounding the Co2+ ion and changes of the coordination number of this ion lead to pronounced changes in the electron absorption spectrum of the Co2+ ion. 4. This observation, and also the fact that the electron absorption spectrum of the Co2+ ion hydrated in aqueous solution coincides with the spectrum of the octahedral Co(H2O 6 2+ ion in the structure of crystal hydrates, suggests that the nearest environment of the Co2+ ion in dilute aqueous solutions consists of six water molecules forming a regular octahedron.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00744848
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