Materials Data on RbSb2 by Materials Project
RbSb2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Rb is bonded in a 8-coordinate geometry to eight Sb atoms. There are a spread of Rb–Sb bond distances ranging from 3.86–4.02 Å. There are two inequivalent Sb sites. In the first Sb site, Sb is bonded to five equivalent Rb and two equivalent Sb atoms to form distorted SbRb5Sb2 pentagonal bipyramids that share corners with four equivalent SbRb5Sb2 pentagonal bipyramids, corners with nine equivalent SbRb3Sb3 pentagonal pyramids, edges with four equivalent SbRb5Sb2 pentagonal bipyramids, edges with four equivalent SbRb3Sb3 pentagonal pyramids, and faces with three equivalent SbRb5Sb2 pentagonal bipyramids. Both Sb–Sb bond lengths are 2.88 Å. In the second Sb site, Sb is bonded to three equivalent Rb and three Sb atoms to form distorted SbRb3Sb3 pentagonal pyramids that share corners with nine equivalent SbRb5Sb2 pentagonal bipyramids, edges with four equivalent SbRb5Sb2 pentagonal bipyramids, and edges with four equivalent SbRb3Sb3 pentagonal pyramids. The Sb–Sb bond length is 2.89 Å.