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Rb2Mg crystallizes in the orthorhombic Cmcm space group. The structure is one-dimensional and consists of two Rb2Mg ribbons oriented in the (0, 0, 1) direction. Rb is bonded in a 3-coordinate geometry to three equivalent Mg atoms. There are one shorter (3.83 Å) and two longer (4.01 Å) Rb–Mg bond lengths. Mg is bonded in a 8-coordinate geometry to six equivalent Rb and two equivalent Mg atoms. Both Mg–Mg bond lengths are 3.18 Å.
Rb3Mg crystallizes in the orthorhombic Imm2 space group. The structure is one-dimensional and consists of two Rb3Mg ribbons oriented in the (1, 0, 0) direction. there are two inequivalent Rb sites. In the first Rb site, Rb is bonded in a 2-coordinate geometry to two equivalent Mg atoms. Both Rb–Mg bond lengths are 4.00 Å. In the second Rb site, Rb is bonded in a 2-coordinate geometry to two equivalent Mg atoms. Both Rb–Mg bond lengths are 4.18 Å. Mg is bonded in a 6-coordinate geometry to six Rb atoms.
RbMg3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Rb is bonded in a 6-coordinate geometry to twelve equivalent Mg atoms. There are six shorter (4.01 Å) and six longer (4.29 Å) Rb–Mg bond lengths. Mg is bonded in a 10-coordinate geometry to four equivalent Rb and six equivalent Mg atoms. There are four shorter (3.13 Å) and two longer (3.15 Å) Mg–Mg bond lengths.
MgRb crystallizes in the orthorhombic Amm2 space group. The structure is two-dimensional and consists of two MgRb sheets oriented in the (0, 1, 0) direction. there are three inequivalent Rb sites. In the first Rb site, Rb is bonded in a 4-coordinate geometry to two equivalent Rb and four equivalent Mg atoms. Both Rb–Rb bond lengths are 4.78 Å. All Rb–Mg bond lengths are 3.81 Å. In the second Rb site, Rb is bonded in a 6-coordinate geometry to two equivalent Rb and four Mg atoms. Both Rb–Rb bond lengths are 4.20 Å. There are two shorter (4.03 Å) and two longer (4.07 Å) Rb–Mg bond lengths. In the third Rb site, Rb is bonded in a 6-coordinate geometry to six Rb atoms. There are two shorter (4.20 Å) and two longer (4.93 Å) Rb–Rb bond lengths. There are three inequivalent Mg sites. In the first Mg site, Mg is bonded in a 8-coordinate geometry to two equivalent Rb and six Mg atoms. There are two shorter (3.14 Å) and four longer (3.25 Å) Mg–Mg bond lengths. In the second Mg site, Mg is bonded in a 8-coordinate geometry to four equivalent Rb and four Mg atoms. Both Mg–Mg bond lengths are 3.07 Å. In the third Mg site, Mg is bonded in a 8-coordinate geometry to two equivalent Rb and six Mg atoms.
Rb2Mg crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of two Rb2Mg sheets oriented in the (1, 0, 0) direction. there are two inequivalent Rb sites. In the first Rb site, Rb is bonded in a 9-coordinate geometry to four equivalent Mg atoms. There are two shorter (4.28 Å) and two longer (4.30 Å) Rb–Mg bond lengths. In the second Rb site, Rb is bonded in a 4-coordinate geometry to four equivalent Mg atoms. There are two shorter (4.01 Å) and two longer (4.04 Å) Rb–Mg bond lengths. Mg is bonded in a 9-coordinate geometry to eight Rb and one Mg atom. The Mg–Mg bond length is 3.18 Å.
RbMg2 crystallizes in the monoclinic P2_1/m space group. The structure is two-dimensional and consists of one RbMg2 sheet oriented in the (0, 0, 1) direction. Rb is bonded in a 8-coordinate geometry to two equivalent Rb and four Mg atoms. Both Rb–Rb bond lengths are 3.85 Å. There are two shorter (4.04 Å) and two longer (4.13 Å) Rb–Mg bond lengths. There are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 8-coordinate geometry to two equivalent Rb and six equivalent Mg atoms. There are a spread of Mg–Mg bond distances ranging from 3.09–3.15 Å. In the second Mg site, Mg is bonded in a 10-coordinate geometry to two equivalent Rb and eight Mg atoms. Both Mg–Mg bond lengths are 3.33 Å.
Rb3Mg crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are three inequivalent Rb sites. In the first Rb site, Rb is bonded in a 2-coordinate geometry to eight Rb and two equivalent Mg atoms. There are a spread of Rb–Rb bond distances ranging from 4.33–4.89 Å. Both Rb–Mg bond lengths are 4.32 Å. In the second Rb site, Rb is bonded in a 2-coordinate geometry to eight Rb and two equivalent Mg atoms. Both Rb–Rb bond lengths are 4.52 Å. Both Rb–Mg bond lengths are 4.32 Å. In the third Rb site, Rb is bonded in a 2-coordinate geometry to eight Rb and two equivalent Mg atoms. Both Rb–Mg bond lengths are 4.32 Å. Mg is bonded in a 6-coordinate geometry to six Rb atoms.
(Rb)3Mg is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four magnesium molecules and one Rb framework. In the Rb framework, there are two inequivalent Rb sites. In the first Rb site, Rb is bonded in a 8-coordinate geometry to four equivalent Rb atoms. All Rb–Rb bond lengths are 4.40 Å. In the second Rb site, Rb is bonded in a body-centered cubic geometry to eight equivalent Rb atoms.