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BeC2 crystallizes in the tetragonal P4_2/mnm space group. The structure is one-dimensional and consists of two BeC2 ribbons oriented in the (1, 1, 0) direction. Be2+ is bonded in a linear geometry to two equivalent C1- atoms. Both Be–C bond lengths are 1.75 Å. C1- is bonded in a distorted linear geometry to one Be2+ and one C1- atom. The C–C bond length is 1.26 Å.
BeC2 is Copper structured and crystallizes in the cubic Pn-3m space group. The structure is zero-dimensional and consists of four dimethylberyllium molecules. Be2+ is bonded in a linear geometry to two equivalent C1- atoms. Both Be–C bond lengths are 1.63 Å. C1- is bonded in a single-bond geometry to one Be2+ atom.