Zeolitic properties of mixed hexacyanoferrate(II) : K2Zn3[Fe(CN)6]2.xH2O
Abstract
The crystal structure of K2Zn3[Fe(CN)6]2. xH2O is briefly recalled. It shows ellipsoidal cavities whose free volume is 0.215 cm3 g–1. They are linked by ellipsoidal apertures with dimensions 3.9 and 5.2 Å. 8.5 H2O molecules occupy these cavities. They can all be removed by evacuation and heating up to 393 K; the crystal is thermally stable up to 493 K.
Water-vapour isotherms are obtained. H2O molecules can be replaced by other guest molecules and thus CO, N2, C2H4 and C2H6 adsorption isotherms are also obtained.
The material exhibits a molecular sieving effect with molecules whose diameters are larger than the pore sizes.
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