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Ti2GeC is H-Phase structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ti is bonded in a 6-coordinate geometry to three equivalent Ge and three equivalent C atoms. All Ti–Ge bond lengths are 2.76 Å. All Ti–C bond lengths are 2.13 Å. Ge is bonded in a 12-coordinate geometry to six equivalent Ti atoms. C is bonded to six equivalent Ti atoms to form edge-sharing CTi6 octahedra.
Ti3GeC2 crystallizes in the hexagonal P6_3/mmc space group. The structure is two-dimensional and consists of two germanium molecules and two Ti3C2 sheets oriented in the (0, 0, 1) direction. In each Ti3C2 sheet, there are two inequivalent Ti2+ sites. In the first Ti2+ site, Ti2+ is bonded in a distorted T-shaped geometry to three equivalent C4- atoms. All Ti–C bond lengths are 2.09 Å. In the second Ti2+ site, Ti2+ is bonded to six equivalent C4- atoms to form edge-sharing TiC6 octahedra. All Ti–C bond lengths are 2.20 Å. C4- is bonded to six Ti2+ atoms to form a mixture of edge and corner-sharing CTi6 octahedra. The corner-sharing octahedral tilt angles are 0°.