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- Title
Gas Hydrate Frameworks of Allen's Polyhedra. 2. Frameworks on 3–6 and 3–5–6 Nets.
- Authors
Kosyakov, V. I.
- Abstract
The structure of two classes of water molecule frameworks built up of 512(D), 51262(T), 51263(P), and 51264(H) polyhedra is discussed. Polyhedral layers can be distinguished in the frameworks. The centers of the polyhedra belonging to a layer are at the nodes of planar networks consisting of triangular, pentagonal, and hexagonal meshes. The structure of one network determines exclusively the topology of the entire framework. Frameworks on 3–6 nets can be constructed of two types of polyhedral blocks: D3T2P2and D2T6. Frameworks on 3–5–6 nets might include both specific blocks and the blocks involved in the frameworks on 3–5 and 3–6 nets. The paper analyzes the structure of frameworks on the nets built as a series of rows, each of these rows being constructed of pentagons or hexagons exclusively. These frameworks are described by the formula (D3T2P2)x(D4H2)y(D2T6)z, where x ≥ 1, y ≥ 0, and z ≥ 0 (x, y, and z are integers). Since all known frameworks of Allen's polyhedra satisfy this formula, they can be constructed of fragments of gas hydrate lattices with the CS‐1, CS‐2, and HS‐1 structures because they are derivatives of these key structures. Similar frameworks can be constructed of other tetrahedral particles (C, Si, SiO2, etc.).
- Subjects
HYDRATES; POLYHEDRA; SOLID geometry; COMPOSITION of water; MOLECULES; COMPLEX compounds; LATTICE dynamics
- Publication
Journal of Structural Chemistry, 2003, Vol 44, Issue 1, p137
- ISSN
0022-4766
- Publication type
Article
- DOI
10.1023/A:1024945317133