Rb7NbAs4 crystallizes in the orthorhombic Pmn2_1 space group. There are five inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 3-coordinate geometry to one As(1) and two equivalent As(3) atoms. In the second Rb site, Rb(2) is bonded in a 4-coordinate geometry to one As(1), one As(2), and two equivalent As(3) atoms. In the third Rb site, Rb(3) is bonded in a 3-coordinate geometry to one As(1) and two equivalent As(3) atoms. In the fourth Rb site, Rb(4) is bonded in a 3-coordinate geometry to two equivalent As(2) and two equivalent As(3) atoms. In the fifth Rb site, Rb(5) is bonded in a 4-coordinate geometry to one As(1), one As(2), and two equivalent As(3) atoms. Nb(1) is bonded in a tetrahedral geometry to one As(1), one As(2), and two equivalent As(3) atoms. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(3), one Rb(5), two equivalent Rb(2), and one Nb(1) atom. In the second As site, As(2) is bonded in a 1-coordinate geometry to one Rb(5), two equivalent Rb(2), four equivalent Rb(4), and one Nb(1) atom. In the third As site, As(3) is bonded in a 8-coordinate geometry to one Rb(1), one Rb(3), one Rb(5), two equivalent Rb(2), two equivalent Rb(4), and one Nb(1) atom.
Rb7NbAs4 crystallizes in the orthorhombic Pmn2_1 space group. There are five inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 3-coordinate geometry to one As(1) and two equivalent As(3) atoms. The Rb(1)-As(1) bond length is 3.64 Å. Both Rb(1)-As(3) bond lengths are 3.58 Å. In the second Rb site, Rb(2) is bonded in a 4-coordinate geometry to one As(1), one As(2), and two equivalent As(3) atoms. The Rb(2)-As(1) bond length is 3.37 Å. The Rb(2)-As(2) bond length is 3.52 Å. There is one shorter (3.48 Å) and one longer (3.61 Å) Rb(2)-As(3) bond length. In the third Rb site, Rb(3) is bonded in a 3-coordinate geometry to one As(1) and two equivalent As(3) atoms. The Rb(3)-As(1) bond length is 3.41 Å. Both Rb(3)-As(3) bond lengths are 3.48 Å. In the fourth Rb site, Rb(4) is bonded in a 3-coordinate geometry to two equivalent As(2) and two equivalent As(3) atoms. There is one shorter (3.58 Å) and one longer (3.60 Å) Rb(4)-As(2) bond length. There is one shorter (3.58 Å) and one longer (3.83 Å) Rb(4)-As(3) bond length. In the fifth Rb site, Rb(5) is bonded in a 4-coordinate geometry to one As(1), one As(2), and two equivalent As(3) atoms. The Rb(5)-As(1) bond length is 3.31 Å. The Rb(5)-As(2) bond length is 3.63 Å. Both Rb(5)-As(3) bond lengths are 3.58 Å. Nb(1) is bonded in a tetrahedral geometry to one As(1), one As(2), and two equivalent As(3) atoms. The Nb(1)-As(1) bond length is 2.50 Å. The Nb(1)-As(2) bond length is 2.52 Å. Both Nb(1)-As(3) bond lengths are 2.55 Å. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(3), one Rb(5), two equivalent Rb(2), and one Nb(1) atom. In the second As site, As(2) is bonded in a 1-coordinate geometry to one Rb(5), two equivalent Rb(2), four equivalent Rb(4), and one Nb(1) atom. In the third As site, As(3) is bonded in a 8-coordinate geometry to one Rb(1), one Rb(3), one Rb(5), two equivalent Rb(2), two equivalent Rb(4), and one Nb(1) atom.