Rb2GaAs2 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 4-coordinate geometry to one As(2), one As(3), and two equivalent As(1) atoms. In the second Rb site, Rb(2) is bonded in a 9-coordinate geometry to one Ga(2), two equivalent Ga(1), one As(2), one As(4), two equivalent As(1), and two equivalent As(3) atoms. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one As(1), two equivalent As(2), and two equivalent As(4) atoms. In the fourth Rb site, Rb(4) is bonded in a 10-coordinate geometry to two equivalent Ga(1), two equivalent Ga(2), one As(1), one As(2), two equivalent As(3), and two equivalent As(4) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a distorted trigonal planar geometry to two equivalent Rb(2), two equivalent Rb(4), one As(1), one As(3), and one As(4) atom. In the second Ga site, Ga(2) is bonded in a distorted trigonal planar geometry to one Rb(2), two equivalent Rb(4), one As(1), one As(2), and one As(3) atom. There are four inequivalent As sites. In the first As site, As(4) is bonded in a 7-coordinate geometry to one Rb(2), two equivalent Rb(3), two equivalent Rb(4), one Ga(1), and one As(2) atom. In the second As site, As(1) is bonded in a 2-coordinate geometry to one Rb(3), one Rb(4), two equivalent Rb(1), two equivalent Rb(2), one Ga(1), and one Ga(2) atom. In the third As site, As(2) is bonded in a 1-coordinate geometry to one Rb(1), one Rb(2), one Rb(4), two equivalent Rb(3), one Ga(2), and one As(4) atom. In the fourth As site, As(3) is bonded in a 7-coordinate geometry to one Rb(1), two equivalent Rb(2), two equivalent Rb(4), one Ga(1), and one Ga(2) atom.
Rb2GaAs2 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 4-coordinate geometry to one As(2), one As(3), and two equivalent As(1) atoms. The Rb(1)-As(2) bond length is 3.51 Å. The Rb(1)-As(3) bond length is 3.41 Å. There is one shorter (3.51 Å) and one longer (3.54 Å) Rb(1)-As(1) bond length. In the second Rb site, Rb(2) is bonded in a 9-coordinate geometry to one Ga(2), two equivalent Ga(1), one As(2), one As(4), two equivalent As(1), and two equivalent As(3) atoms. The Rb(2)-Ga(2) bond length is 3.68 Å. There is one shorter (3.78 Å) and one longer (3.93 Å) Rb(2)-Ga(1) bond length. The Rb(2)-As(2) bond length is 3.57 Å. The Rb(2)-As(4) bond length is 3.88 Å. There is one shorter (3.71 Å) and one longer (3.75 Å) Rb(2)-As(1) bond length. There is one shorter (3.73 Å) and one longer (3.74 Å) Rb(2)-As(3) bond length. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one As(1), two equivalent As(2), and two equivalent As(4) atoms. The Rb(3)-As(1) bond length is 3.50 Å. There is one shorter (3.56 Å) and one longer (3.58 Å) Rb(3)-As(2) bond length. There is one shorter (3.55 Å) and one longer (3.59 Å) Rb(3)-As(4) bond length. In the fourth Rb site, Rb(4) is bonded in a 10-coordinate geometry to two equivalent Ga(1), two equivalent Ga(2), one As(1), one As(2), two equivalent As(3), and two equivalent As(4) atoms. There is one shorter (3.55 Å) and one longer (3.84 Å) Rb(4)-Ga(1) bond length. There is one shorter (3.60 Å) and one longer (3.81 Å) Rb(4)-Ga(2) bond length. The Rb(4)-As(1) bond length is 3.92 Å. The Rb(4)-As(2) bond length is 3.87 Å. There is one shorter (3.42 Å) and one longer (3.79 Å) Rb(4)-As(3) bond length. There is one shorter (3.63 Å) and one longer (3.65 Å) Rb(4)-As(4) bond length. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a distorted trigonal planar geometry to two equivalent Rb(2), two equivalent Rb(4), one As(1), one As(3), and one As(4) atom. The Ga(1)-As(1) bond length is 2.41 Å. The Ga(1)-As(3) bond length is 2.41 Å. The Ga(1)-As(4) bond length is 2.38 Å. In the second Ga site, Ga(2) is bonded in a distorted trigonal planar geometry to one Rb(2), two equivalent Rb(4), one As(1), one As(2), and one As(3) atom. The Ga(2)-As(1) bond length is 2.43 Å. The Ga(2)-As(2) bond length is 2.38 Å. The Ga(2)-As(3) bond length is 2.38 Å. There are four inequivalent As sites. In the first As site, As(4) is bonded in a 7-coordinate geometry to one Rb(2), two equivalent Rb(3), two equivalent Rb(4), one Ga(1), and one As(2) atom. The As(4)-As(2) bond length is 2.46 Å. In the second As site, As(1) is bonded in a 2-coordinate geometry to one Rb(3), one Rb(4), two equivalent Rb(1), two equivalent Rb(2), one Ga(1), and one Ga(2) atom. In the third As site, As(2) is bonded in a 1-coordinate geometry to one Rb(1), one Rb(2), one Rb(4), two equivalent Rb(3), one Ga(2), and one As(4) atom. In the fourth As site, As(3) is bonded in a 7-coordinate geometry to one Rb(1), two equivalent Rb(2), two equivalent Rb(4), one Ga(1), and one Ga(2) atom.