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ScCd is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Sc is bonded in a body-centered cubic geometry to eight equivalent Cd atoms. All Sc–Cd bond lengths are 3.07 Å. Cd is bonded in a body-centered cubic geometry to eight equivalent Sc atoms.
ScCd3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Sc is bonded to twelve equivalent Cd atoms to form ScCd12 cuboctahedra that share corners with six equivalent ScCd12 cuboctahedra, corners with twelve equivalent CdSc4Cd8 cuboctahedra, edges with eighteen equivalent CdSc4Cd8 cuboctahedra, faces with eight equivalent ScCd12 cuboctahedra, and faces with twelve equivalent CdSc4Cd8 cuboctahedra. There are six shorter (3.07 Å) and six longer (3.20 Å) Sc–Cd bond lengths. Cd is bonded to four equivalent Sc and eight equivalent Cd atoms to form distorted CdSc4Cd8 cuboctahedra that share corners with four equivalent ScCd12 cuboctahedra, corners with fourteen equivalent CdSc4Cd8 cuboctahedra, edges with six equivalent ScCd12 cuboctahedra, edges with twelve equivalent CdSc4Cd8 cuboctahedra, faces with four equivalent ScCd12 cuboctahedra, and faces with sixteen equivalent CdSc4Cd8 cuboctahedra. There are a spread of Cd–Cd bond distances ranging from 3.07–3.21 Å.
ScCd7 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Sc is bonded to fourteen Cd atoms to form a mixture of distorted corner and face-sharing ScCd14 cuboctahedra. There are a spread of Sc–Cd bond distances ranging from 3.17–3.78 Å. There are four inequivalent Cd sites. In the first Cd site, Cd is bonded in a 11-coordinate geometry to two equivalent Sc and nine Cd atoms. There are a spread of Cd–Cd bond distances ranging from 3.02–3.28 Å. In the second Cd site, Cd is bonded in a 11-coordinate geometry to two equivalent Sc and nine Cd atoms. There are a spread of Cd–Cd bond distances ranging from 3.03–3.36 Å. In the third Cd site, Cd is bonded in a 11-coordinate geometry to two equivalent Sc and nine Cd atoms. There are two shorter (2.97 Å) and one longer (3.16 Å) Cd–Cd bond lengths. In the fourth Cd site, Cd is bonded in a 12-coordinate geometry to two equivalent Sc and ten Cd atoms.
Sc3Cd is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Sc is bonded to eight equivalent Sc and four equivalent Cd atoms to form distorted ScSc8Cd4 cuboctahedra that share corners with four equivalent CdSc12 cuboctahedra, corners with fourteen equivalent ScSc8Cd4 cuboctahedra, edges with six equivalent CdSc12 cuboctahedra, edges with twelve equivalent ScSc8Cd4 cuboctahedra, faces with four equivalent CdSc12 cuboctahedra, and faces with sixteen equivalent ScSc8Cd4 cuboctahedra. There are a spread of Sc–Sc bond distances ranging from 3.16–3.25 Å. All Sc–Cd bond lengths are 3.20 Å. Cd is bonded to twelve equivalent Sc atoms to form CdSc12 cuboctahedra that share corners with six equivalent CdSc12 cuboctahedra, corners with twelve equivalent ScSc8Cd4 cuboctahedra, edges with eighteen equivalent ScSc8Cd4 cuboctahedra, faces with eight equivalent CdSc12 cuboctahedra, and faces with twelve equivalent ScSc8Cd4 cuboctahedra.