BeP2N4 crystallizes in the trigonal R-3 space group. Be(1) is bonded to one N(1), one N(2), one N(3), and one N(4) atom to form BeN4 tetrahedra that share corners with four equivalent P(1)N4 tetrahedra and corners with four equivalent P(2)N4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one N(1), one N(2), and two equivalent N(4) atoms to form PN4 tetrahedra that share corners with two equivalent P(1)N4 tetrahedra, corners with two equivalent P(2)N4 tetrahedra, and corners with four equivalent Be(1)N4 tetrahedra. In the second P site, P(2) is bonded to one N(1), one N(2), and two equivalent N(3) atoms to form PN4 tetrahedra that share corners with two equivalent P(1)N4 tetrahedra, corners with two equivalent P(2)N4 tetrahedra, and corners with four equivalent Be(1)N4 tetrahedra. There are four inequivalent N sites. In the first N site, N(3) is bonded in a trigonal planar geometry to one Be(1) and two equivalent P(2) atoms. In the second N site, N(4) is bonded in a trigonal planar geometry to one Be(1) and two equivalent P(1) atoms. In the third N site, N(1) is bonded in a trigonal planar geometry to one Be(1), one P(1), and one P(2) atom. In the fourth N site, N(2) is bonded in a trigonal planar geometry to one Be(1), one P(1), and one P(2) atom.
BeP2N4 crystallizes in the trigonal R-3 space group. Be(1) is bonded to one N(1), one N(2), one N(3), and one N(4) atom to form BeN4 tetrahedra that share corners with four equivalent P(1)N4 tetrahedra and corners with four equivalent P(2)N4 tetrahedra. The Be(1)-N(1) bond length is 1.75 Å. The Be(1)-N(2) bond length is 1.73 Å. The Be(1)-N(3) bond length is 1.73 Å. The Be(1)-N(4) bond length is 1.76 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one N(1), one N(2), and two equivalent N(4) atoms to form PN4 tetrahedra that share corners with two equivalent P(1)N4 tetrahedra, corners with two equivalent P(2)N4 tetrahedra, and corners with four equivalent Be(1)N4 tetrahedra. The P(1)-N(1) bond length is 1.65 Å. The P(1)-N(2) bond length is 1.65 Å. Both P(1)-N(4) bond lengths are 1.64 Å. In the second P site, P(2) is bonded to one N(1), one N(2), and two equivalent N(3) atoms to form PN4 tetrahedra that share corners with two equivalent P(1)N4 tetrahedra, corners with two equivalent P(2)N4 tetrahedra, and corners with four equivalent Be(1)N4 tetrahedra. The P(2)-N(1) bond length is 1.65 Å. The P(2)-N(2) bond length is 1.65 Å. There is one shorter (1.63 Å) and one longer (1.64 Å) P(2)-N(3) bond length. There are four inequivalent N sites. In the first N site, N(3) is bonded in a trigonal planar geometry to one Be(1) and two equivalent P(2) atoms. In the second N site, N(4) is bonded in a trigonal planar geometry to one Be(1) and two equivalent P(1) atoms. In the third N site, N(1) is bonded in a trigonal planar geometry to one Be(1), one P(1), and one P(2) atom. In the fourth N site, N(2) is bonded in a trigonal planar geometry to one Be(1), one P(1), and one P(2) atom.