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Be2TaOs crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Be2TaOs ribbons oriented in the (1, 0, 0) direction. Be is bonded in a linear geometry to one Ta and one Os atom. The Be–Ta bond length is 2.48 Å. The Be–Os bond length is 2.13 Å. Ta is bonded in a linear geometry to two equivalent Be atoms. Os is bonded in a linear geometry to two equivalent Be atoms.
BeTaOs2 crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two BeTaOs2 ribbons oriented in the (1, 0, 0) direction. Be is bonded in a linear geometry to two equivalent Os atoms. Both Be–Os bond lengths are 2.25 Å. Ta is bonded in a linear geometry to two equivalent Os atoms. Both Ta–Os bond lengths are 2.24 Å. Os is bonded in a linear geometry to one Be and one Ta atom.