RbAlH4 crystallizes in the orthorhombic Pnma space group. Rb(1) is bonded in a 8-coordinate geometry to one H(2), one H(3), and six equivalent H(1) atoms. Al(1) is bonded in a tetrahedral geometry to one H(2), one H(3), and two equivalent H(1) atoms. There are three inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to three equivalent Rb(1) and one Al(1) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one Rb(1) and one Al(1) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to one Rb(1) and one Al(1) atom.
RbAlH4 crystallizes in the orthorhombic Pnma space group. Rb(1) is bonded in a 8-coordinate geometry to one H(2), one H(3), and six equivalent H(1) atoms. The Rb(1)-H(2) bond length is 2.88 Å. The Rb(1)-H(3) bond length is 2.86 Å. There are a spread of Rb(1)-H(1) bond distances ranging from 2.92-3.09 Å. Al(1) is bonded in a tetrahedral geometry to one H(2), one H(3), and two equivalent H(1) atoms. The Al(1)-H(2) bond length is 1.62 Å. The Al(1)-H(3) bond length is 1.62 Å. Both Al(1)-H(1) bond lengths are 1.63 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to three equivalent Rb(1) and one Al(1) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one Rb(1) and one Al(1) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to one Rb(1) and one Al(1) atom.