Inclusion complexes of zeolites. Part 1.—Inclusion complexes of zeolite 4A with silver nitrate and alkali nitrates
- 1 January 1981
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 77 (2) , 379-389
- https://doi.org/10.1039/f19817700379
Abstract
The structural properties of inclusion complexes of zeolite 4A with alkali nitrates and silver nitrate have been investigated from the point of view of the state and position of the included component. The crystal structures of alkali nitrate complexes, Li12A˙9.8LiNO3˙9.3H2O and Na12A˙10NaNO3˙6.6H2O, have been solved and refined in the cubic space-group Pm3m; at 24 °C the unit-cell constants are: a0= 12.075(1)Å and a0= 12.295(1)Å, respectively. For Ag12A˙9.5AgNO3˙5.9H2O complex the unit-cell constant is a0= 12.340(1)Å. On the basis of i.r. and X-ray structure analyses it is found that the included nitrate in zeolite cages exists partially as a nitrate ion and partially as a nitrato complex. The nitrate ions, situated near the S6R, are in coordination with the zeolite counter-ion and also with the closest included cations. The nitrato ions, situated near the S8R, are in coordination with included cations only.Keywords
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