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Zusammensetzung und strukturelle Eigenschaften des „zweiwertigen”︁ Kobaltcyanids
Author(s) -
Güdel H. U.,
Ludi A.
Publication year - 1969
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19690520809
Subject(s) - chemistry , aqueous solution , cobalt , crystallography , cyanide , infrared spectroscopy , stoichiometry , molecule , infrared , chloride , inorganic chemistry , organic chemistry , physics , optics
The products obtained by mixing aqueous solutions of cobalt (II) chloride and potassium or hydrogen cyanide are nonstoichiometric compounds Co(CN) x , yH 2 O whith x between 2.2 and 2.4 and y between 1.75 and 2.15. They have a cubic face‐centered unit cell with a = 10.20 ± 0.02 Å and Z between 6.8 and 7.1 ( Z = number of units Co (CN) x yH 2 O per cell). Infrared spectra show that there is zeolitic as well as coordinated water present. The coordination units derived from reflectance spectra in the ultraviolet and visible region are (Co III )C 6 and Co II N 6‐x O x . There exists a close structural relationship between Co(CN) x , yH 2 O and the stoichiometric compound Co 3 [Co(CN) 6 ] 2 , zH 2 O. Comparison of calculated with experimental density shows that there must be holes in the threedimensional CoCNCo‐framework, which can be occupied by water molecules.