Control on arrangement of AgI clusters incorporated into zeolite LTA

AgI clusters were incorporated into Li, Na, and K-form LTAzeolites with a loading number of four AgI molecules per -cage.The X-ray powder diffraction (XRD) patterns and opticalabsorption spectra of the samples were obtained. The XRDpatterns indicate that the sizes of the clusters and theirarrangements depend on the type of alkali-cations. AgI clusterswith different sizes, i.e.,(AgI)_n and (AgI)_8–n (5n7),are arrayed alternatively in Na-form LTA conforming to the spacegroup of P2₁3. AgI-loadedLi-form LTA also conformed to the space group ofP2₁3,although (AgI)_n clusters seem to bedistributed disorderly. On the contrary,(AgI)₄ cluster is in each cage in K-formLTA conforming to the space group of or. Theoptical spectra showed that Li and Na-form LTAs include(AgI)_n (5 n), and that K-form LTA includes(AgI)₄ cluster in each cage.