Materials Data on In2Hg8As5Br7 by Materials Project
(Hg2As)4In2AsBr6Br is beta Tridymite-derived structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional and consists of two hydrobromic acid molecules, two In2AsBr6 clusters, and one Hg2As framework. In each In2AsBr6 cluster, In3+ is bonded to one As3- and three Br1- atoms to form corner-sharing InAsBr3 tetrahedra. The In–As bond length is 2.64 Å. All In–Br bond lengths are 2.58 Å. As3- is bonded in a linear geometry to two equivalent In3+ atoms. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a single-bond geometry to one In3+ atom. In the second Br1- site, Br1- is bonded in a single-bond geometry to one In3+ atom. In the Hg2As framework, there are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a linear geometry to two As3- atoms. There are one shorter (2.55 Å) and one longer (2.56 Å) Hg–As bond lengths. In the second Hg2+ site, Hg2+ is bonded in a linear geometry to two equivalent As3- atoms. Both Hg–As bond lengths are 2.54 Å. In the third Hg2+ site, Hg2+ is bonded in a linear geometry to two equivalent As3- atoms. Both Hg–As bond lengths are 2.53 Å. In the fourth Hg2+ site, Hg2+ is bonded in a linear geometry to two equivalent As3- atoms. Both Hg–As bond lengths are 2.53 Å. There are two inequivalent As3- sites. In the first As3- site, As3- is bonded to four Hg2+ atoms to form corner-sharing AsHg4 tetrahedra. In the second As3- site, As3- is bonded to four Hg2+ atoms to form corner-sharing AsHg4 tetrahedra.