Abstract
Abstract The com pounds LiGaBr4 and LiGaBr3 are prepared by reaction of stoichiometric mixtures of LiBr and GaBr3 or GaBr2, respectively, in glass am poules at 250 °C. Single crystal X-ray studies show LiGaBr4 to be isotypic to LiAlCl4 containing GaBr4 tetrahedra arranged as in the structure of SnBr4 and Li+ ions filling octahedral voids [d̄(GaBr) = 232.5, d̄(Li -Br) = 280.3 pm]. LiGaBr, has to be formulated as Li2[Ga2Br6] and the Ga -Ga-bonded unit Ga2Br6 has an ecliptic conformation. The L i+ ions occupy octahedral voids, and the LiBr6 octahedra are linked via apices, [d(Ga -Ga) = 240.4, d̄(Ga -Br) = 238.9, d̄(L i-B r) = 281.1 pm]. The structures is compared with the structures of PuBr3, Re3B, FeB and Ga2I3, and the group-subgroup relationship with GdFeO3 is established.
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