Rb3BN2 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to two equivalent B(1), two equivalent N(1), and two equivalent N(2) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to two equivalent B(1), two equivalent N(1), and two equivalent N(2) atoms. In the third Rb site, Rb(3) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form corner-sharing RbN4 tetrahedra. B(1) is bonded in a linear geometry to two equivalent Rb(1), two equivalent Rb(2), one N(1), and one N(2) atom. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one B(1) atom. In the second N site, N(2) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one B(1) atom.
Rb3BN2 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to two equivalent B(1), two equivalent N(1), and two equivalent N(2) atoms. There is one shorter (3.12 Å) and one longer (3.19 Å) Rb(1)-B(1) bond length. There is one shorter (3.05 Å) and one longer (3.16 Å) Rb(1)-N(1) bond length. There is one shorter (3.03 Å) and one longer (3.30 Å) Rb(1)-N(2) bond length. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to two equivalent B(1), two equivalent N(1), and two equivalent N(2) atoms. There is one shorter (3.14 Å) and one longer (3.24 Å) Rb(2)-B(1) bond length. There is one shorter (3.09 Å) and one longer (3.42 Å) Rb(2)-N(1) bond length. There is one shorter (3.00 Å) and one longer (3.17 Å) Rb(2)-N(2) bond length. In the third Rb site, Rb(3) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form corner-sharing RbN4 tetrahedra. There is one shorter (2.89 Å) and one longer (2.92 Å) Rb(3)-N(1) bond length. There is one shorter (3.01 Å) and one longer (3.04 Å) Rb(3)-N(2) bond length. B(1) is bonded in a linear geometry to two equivalent Rb(1), two equivalent Rb(2), one N(1), and one N(2) atom. The B(1)-N(1) bond length is 1.36 Å. The B(1)-N(2) bond length is 1.36 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one B(1) atom. In the second N site, N(2) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one B(1) atom.