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LaRu3Si2 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. La2+ is bonded in a hexagonal planar geometry to six equivalent Si4- atoms. All La–Si bond lengths are 3.29 Å. Ru2+ is bonded in a square co-planar geometry to four equivalent Si4- atoms. All Ru–Si bond lengths are 2.44 Å. Si4- is bonded in a 9-coordinate geometry to three equivalent La2+ and six equivalent Ru2+ atoms.
LaRu3Si2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. La2+ is bonded in a hexagonal planar geometry to six equivalent Si4- atoms. All La–Si bond lengths are 3.30 Å. Ru2+ is bonded in a square co-planar geometry to four equivalent Si4- atoms. All Ru–Si bond lengths are 2.44 Å. Si4- is bonded in a 6-coordinate geometry to three equivalent La2+ and six equivalent Ru2+ atoms.