Ba2Y5Cl19 crystallizes in the monoclinic P2_1/c space group. Ba(1) is bonded to one Cl(2), one Cl(4), one Cl(5), and one Cl(8) atom to form distorted BaCl4 tetrahedra that share  a cornercorner with one Y(1)Cl6 octahedra and corners with three equivalent Y(2)Cl6 octahedra. The corner-sharing octahedral tilt angles range from 30-53°. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded to one Cl(1), one Cl(10), one Cl(2), one Cl(6), one Cl(7), and one Cl(9) atom to form YCl6 octahedra that share  a cornercorner with one Y(1)Cl6 octahedra, corners with two equivalent Y(2)Cl6 octahedra, corners with two equivalent Y(3)Cl6 octahedra, and  a cornercorner with one Ba(1)Cl4 tetrahedra. The corner-sharing octahedral tilt angles range from 0-33°. In the second Y site, Y(2) is bonded to one Cl(10), one Cl(3), one Cl(4), one Cl(5), one Cl(8), and one Cl(9) atom to form YCl6 octahedra that share  a cornercorner with one Y(3)Cl6 octahedra, corners with two equivalent Y(1)Cl6 octahedra, and corners with three equivalent Ba(1)Cl4 tetrahedra. The corner-sharing octahedral tilt angles range from 9-33°. In the third Y site, Y(3) is bonded to two equivalent Cl(3), two equivalent Cl(6), and two equivalent Cl(7) atoms to form corner-sharing YCl6 octahedra. The corner-sharing octahedral tilt angles range from 9-20°. There are ten inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a linear geometry to two equivalent Y(1) atoms. In the second Cl site, Cl(2) is bonded in a bent 150 degrees geometry to one Ba(1) and one Y(1) atom. In the third Cl site, Cl(3) is bonded in a linear geometry to one Y(2) and one Y(3) atom. In the fourth Cl site, Cl(4) is bonded in a bent 120 degrees geometry to one Ba(1) and one Y(2) atom. In the fifth Cl site, Cl(5) is bonded in a bent 150 degrees geometry to one Ba(1) and one Y(2) atom. In the sixth Cl site, Cl(6) is bonded in a linear geometry to one Y(1) and one Y(3) atom. In the seventh Cl site, Cl(7) is bonded in a bent 150 degrees geometry to one Y(1) and one Y(3) atom. In the eighth Cl site, Cl(8) is bonded in a bent 150 degrees geometry to one Ba(1) and one Y(2) atom. In the ninth Cl site, Cl(9) is bonded in a bent 150 degrees geometry to one Y(1) and one Y(2) atom. In the tenth Cl site, Cl(10) is bonded in a bent 150 degrees geometry to one Y(1) and one Y(2) atom.
Ba2Y5Cl19 crystallizes in the monoclinic P2_1/c space group. Ba(1) is bonded to one Cl(2), one Cl(4), one Cl(5), and one Cl(8) atom to form distorted BaCl4 tetrahedra that share  a cornercorner with one Y(1)Cl6 octahedra and corners with three equivalent Y(2)Cl6 octahedra. The corner-sharing octahedral tilt angles range from 30-53°. The Ba(1)-Cl(2) bond length is 2.94 Å. The Ba(1)-Cl(4) bond length is 2.97 Å. The Ba(1)-Cl(5) bond length is 2.94 Å. The Ba(1)-Cl(8) bond length is 2.97 Å. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded to one Cl(1), one Cl(10), one Cl(2), one Cl(6), one Cl(7), and one Cl(9) atom to form YCl6 octahedra that share  a cornercorner with one Y(1)Cl6 octahedra, corners with two equivalent Y(2)Cl6 octahedra, corners with two equivalent Y(3)Cl6 octahedra, and  a cornercorner with one Ba(1)Cl4 tetrahedra. The corner-sharing octahedral tilt angles range from 0-33°. The Y(1)-Cl(1) bond length is 2.62 Å. The Y(1)-Cl(10) bond length is 2.66 Å. The Y(1)-Cl(2) bond length is 2.60 Å. The Y(1)-Cl(6) bond length is 2.68 Å. The Y(1)-Cl(7) bond length is 2.68 Å. The Y(1)-Cl(9) bond length is 2.66 Å. In the second Y site, Y(2) is bonded to one Cl(10), one Cl(3), one Cl(4), one Cl(5), one Cl(8), and one Cl(9) atom to form YCl6 octahedra that share  a cornercorner with one Y(3)Cl6 octahedra, corners with two equivalent Y(1)Cl6 octahedra, and corners with three equivalent Ba(1)Cl4 tetrahedra. The corner-sharing octahedral tilt angles range from 9-33°. The Y(2)-Cl(10) bond length is 2.64 Å. The Y(2)-Cl(3) bond length is 2.70 Å. The Y(2)-Cl(4) bond length is 2.63 Å. The Y(2)-Cl(5) bond length is 2.62 Å. The Y(2)-Cl(8) bond length is 2.67 Å. The Y(2)-Cl(9) bond length is 2.65 Å. In the third Y site, Y(3) is bonded to two equivalent Cl(3), two equivalent Cl(6), and two equivalent Cl(7) atoms to form corner-sharing YCl6 octahedra. The corner-sharing octahedral tilt angles range from 9-20°. Both Y(3)-Cl(3) bond lengths are 2.65 Å. Both Y(3)-Cl(6) bond lengths are 2.69 Å. Both Y(3)-Cl(7) bond lengths are 2.66 Å. There are ten inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a linear geometry to two equivalent Y(1) atoms. In the second Cl site, Cl(2) is bonded in a bent 150 degrees geometry to one Ba(1) and one Y(1) atom. In the third Cl site, Cl(3) is bonded in a linear geometry to one Y(2) and one Y(3) atom. In the fourth Cl site, Cl(4) is bonded in a bent 120 degrees geometry to one Ba(1) and one Y(2) atom. In the fifth Cl site, Cl(5) is bonded in a bent 150 degrees geometry to one Ba(1) and one Y(2) atom. In the sixth Cl site, Cl(6) is bonded in a linear geometry to one Y(1) and one Y(3) atom. In the seventh Cl site, Cl(7) is bonded in a bent 150 degrees geometry to one Y(1) and one Y(3) atom. In the eighth Cl site, Cl(8) is bonded in a bent 150 degrees geometry to one Ba(1) and one Y(2) atom. In the ninth Cl site, Cl(9) is bonded in a bent 150 degrees geometry to one Y(1) and one Y(2) atom. In the tenth Cl site, Cl(10) is bonded in a bent 150 degrees geometry to one Y(1) and one Y(2) atom.