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Über kristallines Chrom(III)hydroxid. I
Author(s) -
Giovanoli Rudolf,
Stadelmann Willy,
Feitknecht Walter
Publication year - 1973
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.19730560305
Subject(s) - hydroxide , chemistry , octahedron , hydrate , amorphous solid , chromium , ion , inorganic chemistry , nuclear chemistry , crystallography , organic chemistry
When hydroxide ions are added to a solution of Cr(H 2 O) 6 3+ ions at low temperature a well crystallized chromium hydroxide hydrate is formed, corresponding to the formula [Cr(OH) 3 ‐(H 2 O) 3 ] ∞ . Its structure is the inverse of bayerite type, two thirds of the octahedral M 3+ positions being vacant. It loses water easily and turns into a totally amorphous hydroxide of variable water content. An amorphous hydroxide is also obtained when solutions are alkalized at higher temperatures or when aged solutions (containing polynuclear complexes) are used.