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Cs(BH)6 crystallizes in the cubic Fm-3 space group. The structure is three-dimensional. Cs is bonded in a distorted q6 geometry to twelve equivalent H atoms. All Cs–H bond lengths are 3.18 Å. B is bonded in a single-bond geometry to one H atom. The B–H bond length is 1.21 Å. H is bonded in a single-bond geometry to two equivalent Cs and one B atom.
CsAg(BH)10 crystallizes in the orthorhombic Pbcm space group. The structure is three-dimensional. Cs1+ is bonded in a 5-coordinate geometry to thirteen H1+ atoms. There are a spread of Cs–H bond distances ranging from 3.22–3.41 Å. Ag1+ is bonded in a 6-coordinate geometry to six H1+ atoms. There are a spread of Ag–H bond distances ranging from 2.14–2.40 Å. There are seven inequivalent B+1.20- sites. In the first B+1.20- site, B+1.20- is bonded in a distorted single-bond geometry to one H1+ atom. The B–H bond length is 1.20 Å. In the second B+1.20- site, B+1.20- is bonded in a distorted single-bond geometry to one H1+ atom. The B–H bond length is 1.22 Å. In the third B+1.20- site, B+1.20- is bonded in a distorted single-bond geometry to one H1+ atom. The B–H bond length is 1.20 Å. In the fourth B+1.20- site, B+1.20- is bonded in a distorted single-bond geometry to one H1+ atom. The B–H bond length is 1.20 Å. In the fifth B+1.20- site, B+1.20- is bonded in a distorted single-bond geometry to one H1+ atom. The B–H bond length is 1.22 Å. In the sixth B+1.20- site, B+1.20- is bonded in a distorted single-bond geometry to one H1+ atom. The B–H bond length is 1.20 Å. In the seventh B+1.20- site, B+1.20- is bonded in a distorted single-bond geometry to one H1+ atom. The B–H bond length is 1.22 Å. There are seven inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one Cs1+ and one B+1.20- atom. In the second H1+ site, H1+ is bonded in a distorted single-bond geometry to one Cs1+, one Ag1+, and one B+1.20- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to two equivalent Cs1+ and one B+1.20- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one Cs1+, two equivalent Ag1+, and one B+1.20- atom. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one Cs1+ and one B+1.20- atom. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to two equivalent Cs1+ and one B+1.20- atom. In the seventh H1+ site, H1+ is bonded in a distorted single-bond geometry to one Cs1+, one Ag1+, and one B+1.20- atom.