Materials Data on Si3H by Materials Project

(Si)6H2 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four hydrogen molecules and one Si framework. In the Si framework, there are two inequivalent Si sites. In the first Si site, Si is bonded to four equivalent Si atoms to form a mixture of distorted edge and corner-sharing SiSi4 tetrahedra. All Si–Si bond lengths are 2.51 Å. In the second Si site, Si is bonded in a body-centered cubic geometry to eight equivalent Si atoms.