Similarities between the clathrasils DOH, DDR, MEP and MTN
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Henk van Koningsveld
Abstract
Clathrasils are porous framework silicates with cage-like voids. Structural similarities between the clathrasils DOH, MTN, MEP, DD3H and DDR have been analyzed in the context of host/guest interaction and crystallization mechanism. A building unit consisting of 30 T atoms is used as common structural feature to give an alternative description of the well-known layers of [512]-cages. The [512]-layers, or Periodic Building Units (PerBU’s), are constructed from two 12-rings connected through a common 6-ring to form two half cages or a 12-ring double cup. These ‘half-cages’ are essentially the bottom of the large ‘inter-layer’ cages in the clathrasils. The rigorous derivation of all possible framework types and their cages based on these principles shows the richness of the concept and makes possible new strategies for the synthesis. The ‘half-cages’ are also possible candidates for precursors which might exist in solution in close contact with templating guest species initiating the nucleation of the crystals.
© 2004 Oldenbourg Wissenschaftsverlag GmbH
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- Books Received
Articles in the same Issue
- Structural changes upon the temperature dependent C2/c → P21/c phase transition in LiMe3+Si2O6 clinopyroxenes, Me = Cr, Ga, Fe, V, Sc and In
- X-ray diffraction study of decagonal Al—Co—Ni as a function of composition
- The correlation between metal oxidation state and bond valence parameters for M—O bonds (M = V, Fe and Cu). A simple method to search for the metal oxidation-state independent parameter pairs
- The crystal structures of Hg7Se3O13H2 and Hg8Se4O17H2 — two mixed-valent mercury oxoselenium compounds with a multifarious crystal chemistry
- Calculated growth form of melilites
- Similarities between the clathrasils DOH, DDR, MEP and MTN
- Thermal expansion, elastic and thermoelastic properties including crystal structure analyses of K-, Rb- and Cs-nitrilotriacetates
- Dichloro(cyclohexilidene-1-methylene)(phenyl)Te(IV). Looking for the theoretical treatment
- Synthesis, crystal structure and molecular conformation of (±)-1-oxoferruginol and (±)-shonanol
- Triphenylphosphine adducts of silver di-iso-propyl dithiophosphate
- In-situ pressure crystallization and X-ray diffraction study of 1,1,2,2-tetrachloroethane at 0.5 GPa
- Books Received
