Crystallographic isomorphism in the structural type of α-HgI2 by example of KHgI3 · H2O, β-Ag2HgI4, and β-Cu2HgI4
- Authors: Borisov S.V.1, Magarill S.A.1, Pervukhina N.V.1
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Affiliations:
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch
- Issue: Vol 62, No 2 (2017)
- Pages: 185-188
- Section: Theory of Crystal Structures
- URL: https://journals.rcsi.science/1063-7745/article/view/190707
- DOI: https://doi.org/10.1134/S1063774517020092
- ID: 190707
Cite item
Abstract
The structure of KHgI3 · H2O is assigned to the family of crystal structures having the three-layer cubic packing of iodine anions with cations in the tetrahedral voids (the structures of α-HgI2, β-Ag2HgI4, and β-Cu2HgI4 among them). Crystallographic analysis shows that the nodes of the three-layer close packing are populated by iodine anions and K cations in the ratio 3/4: 1/4. Transformation of the structure of α-HgI2 into the structure of KHgI3 · H2O can be formally represented as the replacement of (HgI)n+ fragments by (KH2O)n+ fragments: (Hg2I4)–(HgI)+ + (KH2O)n+ = KHgI3 · H2O. Perforated layers of vertex-sharing HgI4 tetrahedra break down into parallel isolated chains. Channels formed in place of I–Hg–I–Hg–fragments are occupied by–H2O–K–Н2О–chains weakly bound to neighbors.
About the authors
S. V. Borisov
Nikolaev Institute of Inorganic Chemistry, Siberian Branch
Author for correspondence.
Email: borisov@niic.nsc.ru
Russian Federation, Novosibirsk, 630090
S. A. Magarill
Nikolaev Institute of Inorganic Chemistry, Siberian Branch
Email: borisov@niic.nsc.ru
Russian Federation, Novosibirsk, 630090
N. V. Pervukhina
Nikolaev Institute of Inorganic Chemistry, Siberian Branch
Email: borisov@niic.nsc.ru
Russian Federation, Novosibirsk, 630090