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CrTcSi2 crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two CrTcSi2 ribbons oriented in the (1, 0, 0) direction. Cr3+ is bonded in a linear geometry to two equivalent Si atoms. Both Cr–Si bond lengths are 2.42 Å. Tc3- is bonded in a linear geometry to two equivalent Si atoms. Both Tc–Si bond lengths are 2.31 Å. Si is bonded in a linear geometry to one Cr3+ and one Tc3- atom.
CrTc2Si crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two CrTc2Si ribbons oriented in the (0, 1, 0) direction. Cr2+ is bonded in a linear geometry to two equivalent Tc3- atoms. Both Cr–Tc bond lengths are 2.59 Å. Tc3- is bonded in a linear geometry to one Cr2+ and one Si4+ atom. The Tc–Si bond length is 2.21 Å. Si4+ is bonded in a linear geometry to two equivalent Tc3- atoms.