Electronic states and arrangements of AgI and CuI clusters incorporated into zeolite LTA

摘要

Both AgI and CuI clusters were successfully incorporated into the cages of Na-type LTA.The maximum loading densities of the AgI and CuI molecules per a-cage were 4.0 and 6.3,respectively. In the optical spectra, the lowest absorption bands of both kinds of clusters showa large shift to the higher energy side compared to that of the original bulks. It was found thatthe space group of the original Na-LTA,Fm Fm3 c, changed to lower symmetry ones byincorporation of both kinds of clusters. These are determined by the appearance of newreflections in the X-ray powder diffraction patterns. The physical properties of these twokinds of clusters seem to be slightly different. CuI molecules adsorbed sparsely into the cagehave the property to aggregate and form a cluster. The CuI clusters have large electronvibrationinteraction.