Cu2SiP4 crystallizes in the tetragonal I4_1/a space group. Cu(1) is bonded in a 6-coordinate geometry to two equivalent Cu(1), two equivalent P(1), and two equivalent P(2) atoms. Si(1) is bonded in a distorted square co-planar geometry to two equivalent P(1) and two equivalent P(2) atoms. There are two inequivalent P sites. In the first P site, P(2) is bonded in a 5-coordinate geometry to two equivalent Cu(1), one Si(1), and two equivalent P(1) atoms. In the second P site, P(1) is bonded in a 5-coordinate geometry to two equivalent Cu(1), one Si(1), and two equivalent P(2) atoms.
Cu2SiP4 crystallizes in the tetragonal I4_1/a space group. Cu(1) is bonded in a 6-coordinate geometry to two equivalent Cu(1), two equivalent P(1), and two equivalent P(2) atoms. Both Cu(1)-Cu(1) bond lengths are 2.56 Å. There is one shorter (2.31 Å) and one longer (2.41 Å) Cu(1)-P(1) bond length. There is one shorter (2.57 Å) and one longer (2.82 Å) Cu(1)-P(2) bond length. Si(1) is bonded in a distorted square co-planar geometry to two equivalent P(1) and two equivalent P(2) atoms. Both Si(1)-P(1) bond lengths are 2.28 Å. Both Si(1)-P(2) bond lengths are 2.27 Å. There are two inequivalent P sites. In the first P site, P(2) is bonded in a 5-coordinate geometry to two equivalent Cu(1), one Si(1), and two equivalent P(1) atoms. There is one shorter (2.20 Å) and one longer (2.32 Å) P(2)-P(1) bond length. In the second P site, P(1) is bonded in a 5-coordinate geometry to two equivalent Cu(1), one Si(1), and two equivalent P(2) atoms.