Structural and Diffraction Properties of Incommensurate Solid Inclusion Compounds Formed between α,ω-Dihalogenoalkanes and Tri-ortho-thymotide

Serrano-González, Heliodoro; Harris, Kenneth D. M.

doi:10.1006/jssc.1999.8350

Cited by 2 publications

(1 citation statement)

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“…This effect of apparently independent diffraction patterns for host and guest has previously been reported for a,x-dihalogenoalkane guest molecules in a tri-ortho-thymotide host matrix. 25 In this tunnel-like material the guest contributes some scattering density to the host pattern (peak intensity changes) but the host peaks stay sharp. The guest ordering is mainly in one dimension and only very weak reflections in the other dimensions can be seen in the additional pattern of broad peaks.…”

Section: Discussionmentioning

confidence: 92%

Silver nitrate in silver zeolite A: three-dimensional incommensurate guest ordering in a zeolite framework

et al. 2006

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We report the results of a detailed examination of the occlusion of silver nitrate in silver zeolite A (AgA). The superlattice reported to occur in (AgNO3)9-AgA was found to melt at between 80 and 100 degrees C on heating and reappear when the sample was cooled down to 80 degrees C. Annealing in this temperature range and rigorous exclusion of water produced an enhancement of the superlattice peaks, which results from ordering of the contents of the zeolite cages. Peaks assigned to the superlattice were indexed with the tetragonal lattice parameters a = 17.440(5) and c = 12.398(4) A and proposed space group P4/nmm. The sharp peaks representing the lattice of the framework (a = 12.3711(5) A, Pm3m) remained largely unaffected by the guest in this compound, which was found to exhibit strong negative thermal expansion. The host and guest lattices are incommensurate with the tetragonal guest lattice being slightly larger than the cubic host in the c-direction and slightly smaller in the a- and b-directions.

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Section: Discussionmentioning

confidence: 92%