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Die Kristallstrukturen von Mn 5 O 8 und Cd 2 Mn 3 O 8
Author(s) -
Oswald H. R.,
Wampetich M. J.
Publication year - 1967
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.19670500736
Subject(s) - monoclinic crystal system , chemistry , octahedron , crystallography , crystal structure , manganese , group (periodic table) , single crystal , organic chemistry
The crystal structures of Mn 5 O 8 and Cd 2 Mn 3 O 8 are determined from single crystal and high resolution X ‐ray powder data. Both structures have very similar monoclinic unit cells, space group C 2 h 3 – C 2/m, and are isotypic:Hence, the true formula of Mn 5 O 8 is Mn 2 II Mn 3 IV O 8 . The crystal structure consists of pseudohexagonal Mn IV sheets ( bc ) with similar oxygen sheets on either side, giving a distorted octahedral coordination to the Mn IV . As every fourth Mn IV is missing in these “main layers”, their composition becomes Mn 3 O 8 , and chains of coordination octahedra linked by common edges become distinct. Above and below the empty Mn IV sites are either Mn II or Cd II completing the composition Mn 2 II Mn 3 IV O 8 or Cd 2 Mn 3 O 8 respectively. Examples of similar “double layer” structures are given.