The first polyhedral aluminum subhalide Al Br ⋅20 L forms in the disproportionation of aluminum(I) bromide solutions. The cluster is built up from an Al icosahedron with ten exohedrally bound (formally divalent) Al atoms (see structure). Such a homoatomic framework is unknown for molecular compounds. Even for the element boron this framework is only found as a section from the β-rhombohedral element modification.

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http://dx.doi.org/10.1002/(SICI)1521-3773(19990614)38:12<1739::AID-ANIE1739>3.0.CO;2-6DOI Listing

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