PaAs2 crystallizes in the tetragonal P4/nmm space group. Pa(1) is bonded in a 9-coordinate geometry to four equivalent As(2) and five equivalent As(1) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded to five equivalent Pa(1) atoms to form a mixture of distorted corner and edge-sharing AsPa5 trigonal bipyramids. In the second As site, As(2) is bonded in a 8-coordinate geometry to four equivalent Pa(1) and four equivalent As(2) atoms.
PaAs2 crystallizes in the tetragonal P4/nmm space group. Pa(1) is bonded in a 9-coordinate geometry to four equivalent As(2) and five equivalent As(1) atoms. All Pa(1)-As(2) bond lengths are 3.02 Å. There are four shorter (2.92 Å) and one longer (2.94 Å) Pa(1)-As(1) bond length. There are two inequivalent As sites. In the first As site, As(1) is bonded to five equivalent Pa(1) atoms to form a mixture of distorted corner and edge-sharing AsPa5 trigonal bipyramids. In the second As site, As(2) is bonded in a 8-coordinate geometry to four equivalent Pa(1) and four equivalent As(2) atoms. All As(2)-As(2) bond lengths are 2.84 Å.