Summary
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1.
The electron absorption spectrum of Co2+ ions in aqueous solutions was investigated in the 230–1350 mμ region.
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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.”
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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.
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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 2+6 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.
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Literature cited
A. F. Kapustinskii, Zh. fiz. khim.30, 548 (1956;32. 1648 (1958).
K. P. Mishchenko, Zh. fiz. khim.26, 1736 (1952).
O. Ya. Samilov, Structure of Aqueous Electrolyte Solutions and Ion-Hydration [in Russian] (Izd. AN SSSR, Moscow, 1957).
J. D. Bernal and R. H. Fowler, J. Chem. Phys.1, 515 (1933).
A. M. Azzam Z. Elektrochem.58, 889 (1954).
E. Darmois, Mem. sci. phys. (Paris)48, No. 1 (1946).
J. O'M. Bockris, Modern Aspects of Electrochemistry [Russian translation] (IL. Moscow, 1958).
K. P. Mishchenko and I. S. Pominov, Zh. fiz. khim.31, 2026 (1957).
A. K. Babko and M. M. Tananaiko. Ukr. khim. zh.24, 298 (1958).
A. Zaidel' and V. Rotshtein, Dokl. AN SSSR57, 587 (1947).
V. Rotshtein, Dokl. AN SSSR71, 335 (1950).
L. J. Katzin and E. Gebett, J. Am. Chem. Soc.72, 5455 (1950).
O. G. Holmes and D. McClure, J. Chem. Phys.26, 1686 (1957).
S. V. Grum-Grzhimailo and I. I. Plyusnina. Kristallografiya3, 175 (1958).
A. F. West, Z. Krist.91, 480 (1936).
E. V. Stroganov, I. I. Kozhina, and S. N. Andreev, Vestn. Leningr. un-ta10, 109 (1958).
B. K. Vainshtein, Dokl. AN SSSR68, 301 (1949).
B. F. Ormont, Structures of Inorganic Compounds [in Russian] (GTTI, Moscow-Leningrad, 1950).
H. M. Powell and A. F. Wells, J. Chem. Soc. 359 (1935).
O. M. Ansheles, V. B. Tatarskii, and A. S. Shternberg, Rapid Growing of Homogeneous Crystals from Solutions [in Russian] (Lenizdat, 1945).
GOST 7601-55.
R. Hill and O. Hovell, Phil. Mag.48, 833 (1924).
V. B. Tatarskii, Crystal Optics [In Russian] (Izd. Leningr. un-ta, 1945).
K. B. Yatsimirskii, Thermochemistry of Complex Compounds [in Russian] (Izd. AN SSSR, Moscow, 1951).
S. N. Andreev, V. G. Khaldin, and E. V. Stroganov, Zh. obshchei khimii29, 1798 (1959).
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Translated from Zhurnal Strukturnoi Khimii, Vol. 2, No. 1, pp 7–12, January-February, 1961
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Andreev, S.N., Khaldin, V.G. & Stroganov, E.V. Structure of the hydration shell of the Co2+ ion in aqueous solutions. J Struct Chem 2, 4–8 (1961). https://doi.org/10.1007/BF00744848
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DOI: https://doi.org/10.1007/BF00744848