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Ti2Cu crystallizes in the tetragonal I4/mmm space group. The structure is two-dimensional and consists of two Ti2Cu sheets oriented in the (0, 0, 1) direction. Ti is bonded in a 12-coordinate geometry to four equivalent Cu atoms. All Ti–Cu bond lengths are 2.71 Å. Cu is bonded in a distorted body-centered cubic geometry to eight equivalent Ti atoms.
Ti2Cu(PO5)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Ti4+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.76–2.32 Å. Cu2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Cu–O bond distances ranging from 1.95–2.42 Å. P5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.53–1.57 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Ti4+, one Cu2+, and one P5+ atom. In the second O2- site, O2- is bonded in a bent 150 degrees geometry to one Ti4+ and one P5+ atom. In the third O2- site, O2- is bonded in a bent 150 degrees geometry to one Ti4+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ti4+ and one Cu2+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to one Ti4+, one Cu2+, and one P5+ atom.
Ti2Cu crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. there are two inequivalent Ti sites. In the first Ti site, Ti is bonded in a 6-coordinate geometry to six equivalent Cu atoms. All Ti–Cu bond lengths are 2.50 Å. In the second Ti site, Ti is bonded in a 2-coordinate geometry to two equivalent Cu atoms. Both Ti–Cu bond lengths are 2.67 Å. Cu is bonded in a 12-coordinate geometry to six Ti atoms.
CuTi2(PO4)3 crystallizes in the trigonal R-3c space group. The structure is three-dimensional. Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with six equivalent PO4 tetrahedra. There is three shorter (1.92 Å) and three longer (2.00 Å) Ti–O bond length. Cu1+ is bonded in a 6-coordinate geometry to six equivalent O2- atoms. All Cu–O bond lengths are 2.32 Å. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with four equivalent TiO6 octahedra. The corner-sharing octahedra tilt angles range from 23–40°. There is two shorter (1.54 Å) and two longer (1.55 Å) P–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to one Ti4+ and one P5+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Ti4+, one Cu1+, and one P5+ atom.
Ti2Ni(Ti2Cu)3 crystallizes in the tetragonal P4/mmm space group. The structure is two-dimensional and consists of three Ti2Cu sheets oriented in the (0, 0, 1) direction and one Ti2Ni sheet oriented in the (0, 0, 1) direction. In each Ti2Cu sheet, there are two inequivalent Ti sites. In the first Ti site, Ti is bonded in a 12-coordinate geometry to four equivalent Cu atoms. All Ti–Cu bond lengths are 2.69 Å. In the second Ti site, Ti is bonded in a 12-coordinate geometry to four equivalent Cu atoms. All Ti–Cu bond lengths are 2.72 Å. Cu is bonded in a distorted body-centered cubic geometry to eight Ti atoms. In the Ti2Ni sheet, Ti is bonded in a 12-coordinate geometry to four equivalent Ni atoms. All Ti–Ni bond lengths are 2.63 Å. Ni is bonded in a body-centered cubic geometry to eight equivalent Ti atoms.