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![[Figure 1]](wp3001fig1mag.jpg)
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Figure 1
Representation of the polyhedral cages in Rb8Al7.5(1)Sn38.5. The anisotropic displacement parameters (ADPs) are drawn at the 95% probability level. The framework sites are colored as follows: the Sn1/Al1 24k site is red, the Sn2/Al2 16i site is orange, and the Sn3/Al3 6c site is black. The Rb atoms are shown in light blue. All but one anisotropic displacement parameter showed no anomalies. The ADP for Rb1, site 6d, has an oblately spheroidal shape (U22 = U33 >> U11). This atom is situated at the center of the larger 24-atom cage and the oblate shape is suggestive of an off-centering, as shown in other reports on related structures (Schäfer & Bobev, 2013b  , 2016; Schäfer et al., 2011; Christensen et al., 2010). However, a split-side model refinement in this case was inconclusive. |
![[Figure 1]](wp3001fig1.jpg)
 | STRUCTURAL CHEMISTRY |
ISSN: 2053-2296
