Ge12As11(I)4 crystallizes in the cubic Pm-3n space group. The structure consists of eight hydriodic acid atoms inside a Ge12As11 framework. In the Ge12As11 framework, Ge(1) is bonded to one Ge(1), one As(2), and two equivalent As(1) atoms to form GeGeAs3 tetrahedra that share  a cornercorner with one As(2)Ge4 tetrahedra, corners with four equivalent As(1)Ge3As tetrahedra, and corners with seven equivalent Ge(1)GeAs3 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to three equivalent Ge(1) and one As(1) atom to form AsGe3As tetrahedra that share corners with three equivalent As(1)Ge3As tetrahedra, corners with three equivalent As(2)Ge4 tetrahedra, and corners with six equivalent Ge(1)GeAs3 tetrahedra. In the second As site, As(2) is bonded to four equivalent Ge(1) atoms to form AsGe4 tetrahedra that share corners with four equivalent Ge(1)GeAs3 tetrahedra and corners with eight equivalent As(1)Ge3As tetrahedra.
Ge12As11(I)4 crystallizes in the cubic Pm-3n space group. The structure consists of eight hydriodic acid atoms inside a Ge12As11 framework. In the Ge12As11 framework, Ge(1) is bonded to one Ge(1), one As(2), and two equivalent As(1) atoms to form GeGeAs3 tetrahedra that share  a cornercorner with one As(2)Ge4 tetrahedra, corners with four equivalent As(1)Ge3As tetrahedra, and corners with seven equivalent Ge(1)GeAs3 tetrahedra. The Ge(1)-Ge(1) bond length is 2.64 Å. The Ge(1)-As(2) bond length is 2.57 Å. Both Ge(1)-As(1) bond lengths are 2.61 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded to three equivalent Ge(1) and one As(1) atom to form AsGe3As tetrahedra that share corners with three equivalent As(1)Ge3As tetrahedra, corners with three equivalent As(2)Ge4 tetrahedra, and corners with six equivalent Ge(1)GeAs3 tetrahedra. The As(1)-As(1) bond length is 2.49 Å. In the second As site, As(2) is bonded to four equivalent Ge(1) atoms to form AsGe4 tetrahedra that share corners with four equivalent Ge(1)GeAs3 tetrahedra and corners with eight equivalent As(1)Ge3As tetrahedra.