CaAs2(HO2)4 crystallizes in the triclinic P-1 space group. Ca(1) is bonded in a 8-coordinate geometry to one O(2), one O(4), one O(5), one O(7), two equivalent O(1), and two equivalent O(6) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a tetrahedral geometry to one O(5), one O(6), one O(7), and one O(8) atom. In the second As site, As(2) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are five inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to two equivalent O(8) atoms. In the second H site, H(2) is bonded in a linear geometry to two equivalent O(5) atoms. In the third H site, H(3) is bonded in a single-bond geometry to one O(7) atom. In the fourth H site, H(4) is bonded in a distorted linear geometry to one O(2) and one O(4) atom. In the fifth H site, H(5) is bonded in a linear geometry to one O(3) and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ca(1) and one As(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Ca(1), one As(2), and one H(4) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one As(2) and one H(5) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ca(1), one As(2), and one H(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ca(1), one As(1), and one H(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Ca(1) and one As(1) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Ca(1), one As(1), and one H(3) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one As(1), one H(1), and one H(5) atom.
CaAs2(HO2)4 crystallizes in the triclinic P-1 space group. Ca(1) is bonded in a 8-coordinate geometry to one O(2), one O(4), one O(5), one O(7), two equivalent O(1), and two equivalent O(6) atoms. The Ca(1)-O(2) bond length is 2.77 Å. The Ca(1)-O(4) bond length is 2.38 Å. The Ca(1)-O(5) bond length is 2.48 Å. The Ca(1)-O(7) bond length is 2.96 Å. There is one shorter (2.42 Å) and one longer (2.45 Å) Ca(1)-O(1) bond length. There is one shorter (2.43 Å) and one longer (2.52 Å) Ca(1)-O(6) bond length. There are two inequivalent As sites. In the first As site, As(1) is bonded in a tetrahedral geometry to one O(5), one O(6), one O(7), and one O(8) atom. The As(1)-O(5) bond length is 1.72 Å. The As(1)-O(6) bond length is 1.69 Å. The As(1)-O(7) bond length is 1.78 Å. The As(1)-O(8) bond length is 1.72 Å. In the second As site, As(2) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The As(2)-O(1) bond length is 1.69 Å. The As(2)-O(2) bond length is 1.76 Å. The As(2)-O(3) bond length is 1.77 Å. The As(2)-O(4) bond length is 1.69 Å. There are five inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to two equivalent O(8) atoms. Both H(1)-O(8) bond lengths are 1.21 Å. In the second H site, H(2) is bonded in a linear geometry to two equivalent O(5) atoms. Both H(2)-O(5) bond lengths are 1.21 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(7) atom. The H(3)-O(7) bond length is 1.00 Å. In the fourth H site, H(4) is bonded in a distorted linear geometry to one O(2) and one O(4) atom. The H(4)-O(2) bond length is 1.02 Å. The H(4)-O(4) bond length is 1.63 Å. In the fifth H site, H(5) is bonded in a linear geometry to one O(3) and one O(8) atom. The H(5)-O(3) bond length is 1.02 Å. The H(5)-O(8) bond length is 1.62 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ca(1) and one As(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Ca(1), one As(2), and one H(4) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one As(2) and one H(5) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ca(1), one As(2), and one H(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ca(1), one As(1), and one H(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Ca(1) and one As(1) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Ca(1), one As(1), and one H(3) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one As(1), one H(1), and one H(5) atom.