KAs4(HO4)3 crystallizes in the triclinic P1 space group. K(1) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(12), one O(7), one O(8), one O(9), two equivalent O(5), and two equivalent O(6) atoms. There are four inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(10), one O(12), one O(3), one O(5), and one O(9) atom to form AsO6 octahedra that share  a cornercorner with one As(4)O4 tetrahedra, corners with two equivalent As(3)O4 tetrahedra, and  an edgeedge with one As(2)O6 octahedra. In the second As site, As(2) is bonded to one O(10), one O(11), one O(2), one O(4), one O(6), and one O(9) atom to form AsO6 octahedra that share  a cornercorner with one As(3)O4 tetrahedra, corners with two equivalent As(4)O4 tetrahedra, and  an edgeedge with one As(1)O6 octahedra. In the third As site, As(3) is bonded to one O(1), one O(11), one O(3), and one O(7) atom to form corner-sharing AsO4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-66°. In the fourth As site, As(4) is bonded to one O(12), one O(2), one O(4), and one O(8) atom to form corner-sharing AsO4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-63°. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. In the third H site, H(3) is bonded in a linear geometry to one O(7) and one O(8) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one As(1) and one As(3) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one As(2) and one As(4) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one As(1) and one As(3) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one As(2) and one As(4) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent K(1), one As(1), and one H(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to two equivalent K(1), one As(2), and one H(2) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one K(1), one As(3), and one H(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one K(1), one As(4), and one H(3) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one K(1), one As(1), and one As(2) atom. In the tenth O site, O(10) is bonded in a distorted water-like geometry to one K(1), one As(1), and one As(2) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one K(1), one As(2), and one As(3) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one K(1), one As(1), and one As(4) atom.
KAs4(HO4)3 crystallizes in the triclinic P1 space group. K(1) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(12), one O(7), one O(8), one O(9), two equivalent O(5), and two equivalent O(6) atoms. The K(1)-O(10) bond length is 3.19 Å. The K(1)-O(11) bond length is 2.91 Å. The K(1)-O(12) bond length is 2.95 Å. The K(1)-O(7) bond length is 3.10 Å. The K(1)-O(8) bond length is 3.04 Å. The K(1)-O(9) bond length is 3.16 Å. There is one shorter (2.89 Å) and one longer (3.33 Å) K(1)-O(5) bond length. There is one shorter (2.88 Å) and one longer (3.37 Å) K(1)-O(6) bond length. There are four inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(10), one O(12), one O(3), one O(5), and one O(9) atom to form AsO6 octahedra that share  a cornercorner with one As(4)O4 tetrahedra, corners with two equivalent As(3)O4 tetrahedra, and  an edgeedge with one As(2)O6 octahedra. The As(1)-O(1) bond length is 1.88 Å. The As(1)-O(10) bond length is 1.86 Å. The As(1)-O(12) bond length is 1.89 Å. The As(1)-O(3) bond length is 1.97 Å. The As(1)-O(5) bond length is 1.79 Å. The As(1)-O(9) bond length is 1.85 Å. In the second As site, As(2) is bonded to one O(10), one O(11), one O(2), one O(4), one O(6), and one O(9) atom to form AsO6 octahedra that share  a cornercorner with one As(3)O4 tetrahedra, corners with two equivalent As(4)O4 tetrahedra, and  an edgeedge with one As(1)O6 octahedra. The As(2)-O(10) bond length is 1.86 Å. The As(2)-O(11) bond length is 1.93 Å. The As(2)-O(2) bond length is 1.86 Å. The As(2)-O(4) bond length is 1.95 Å. The As(2)-O(6) bond length is 1.79 Å. The As(2)-O(9) bond length is 1.86 Å. In the third As site, As(3) is bonded to one O(1), one O(11), one O(3), and one O(7) atom to form corner-sharing AsO4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-66°. The As(3)-O(1) bond length is 1.74 Å. The As(3)-O(11) bond length is 1.73 Å. The As(3)-O(3) bond length is 1.73 Å. The As(3)-O(7) bond length is 1.72 Å. In the fourth As site, As(4) is bonded to one O(12), one O(2), one O(4), and one O(8) atom to form corner-sharing AsO4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-63°. The As(4)-O(12) bond length is 1.75 Å. The As(4)-O(2) bond length is 1.76 Å. The As(4)-O(4) bond length is 1.75 Å. The As(4)-O(8) bond length is 1.67 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. The H(1)-O(5) bond length is 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. The H(2)-O(6) bond length is 0.99 Å. In the third H site, H(3) is bonded in a linear geometry to one O(7) and one O(8) atom. The H(3)-O(7) bond length is 1.07 Å. The H(3)-O(8) bond length is 1.43 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one As(1) and one As(3) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one As(2) and one As(4) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one As(1) and one As(3) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one As(2) and one As(4) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent K(1), one As(1), and one H(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to two equivalent K(1), one As(2), and one H(2) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one K(1), one As(3), and one H(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one K(1), one As(4), and one H(3) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one K(1), one As(1), and one As(2) atom. In the tenth O site, O(10) is bonded in a distorted water-like geometry to one K(1), one As(1), and one As(2) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one K(1), one As(2), and one As(3) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one K(1), one As(1), and one As(4) atom.