Six C2B4 carborane cages surround the central region of cluster 1, which has approximate C3 symmetry. Six Li atoms make up a trigonal prism here viewed from the top; solid spheres represent atoms of the upper Li3 plane, dotted spheres the (lower). Three Gd atoms (ellipses) cap the rectangular prism faces. In the center of the cluster is a μ-bridged O atom.
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Oki et al. (1992) studied this question.