KAlH4 crystallizes in the orthorhombic Pnma space group. K(1) is bonded in a 6-coordinate geometry to one H(2), one H(3), and four 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 two equivalent K(1) and one Al(1) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one K(1) and one Al(1) atom. In the third H site, H(3) is bonded in a distorted linear geometry to one K(1) and one Al(1) atom.
KAlH4 crystallizes in the orthorhombic Pnma space group. K(1) is bonded in a 6-coordinate geometry to one H(2), one H(3), and four equivalent H(1) atoms. The K(1)-H(2) bond length is 2.78 Å. The K(1)-H(3) bond length is 2.65 Å. There are two shorter (2.72 Å) and two longer (2.86 Å) K(1)-H(1) bond lengths. 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 1.62 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Al(1) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one K(1) and one Al(1) atom. In the third H site, H(3) is bonded in a distorted linear geometry to one K(1) and one Al(1) atom.