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located entirely in the six-ring sites SI, SI(, and SII with an additional small occupancy at SII(. No silver was located in the supercage SIII locations. The material never took the characteristic golden yellow color associated with silver clusters and the interatomic distance for the SI-SI′ sites is too low, at 2.43 Å, for simultaneous occupancy. Likewise, the SII-SII′ interatomic distance, at 2.77 Å, is short, and the simultaneous occupancy necessary for cluster formation is unlikely. The Ag(I′)– Ag(II′) interatomic distance, however, at 2.98 Å is near that of the linear clusters reported by Gellens et al. thus there may be some interaction in the form of a diatomic (Ag2) cluster at the SI′-SII′ location.14 If this is the case, it would seem that, because of the short distance, there is reduction to silver metal such that the cluster is (Ag2)+ (i.e., Ag0- Ag+). The Ag(I′)-O3 interatomic distance, 2.28 Å, is consistent with 3-coordination when compared to reference values of 2.17 and 2.52 Å for Ag+ in 2- and 4- coordination.15,27 The Ag(II)-O2 distance, at 2.42 Å, is slightly higher than expected but easily within reason for Ag+ in 3-coordination. When compared with the previous results of Gellens et al., as shown in Table 8, the occupancies are quite similar with Gellens reporting a higher population at SI (12.8/uc versus 9.9/uc reported here).14 However, we have located considerably more Ag in SII (27.2/uc reported here versus 19.5/uc by Gellens). Ag-X-450. For reasons unknown, this data proved to be the most challenging to refine. Nevertheless, as with the Ag-Y sample, the agreement of the experimental and the refined model are good (Rf2 = 0.0589, χ2= 2.132). An excess (107%) of the expected silver atoms were located in this sample. All efforts to reduce this amount were unsuccessful; so these results are reported. Silver was primarily found in the six-ring 22PDF Image | PSA USING SUPERIOR ADSORBENTS
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