H4SO5 crystallizes in the monoclinic Pc space group. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(4) and one O(6) atom. In the second H site, H(2) is bonded in a linear geometry to one O(10) and one O(8) atom. In the third H site, H(3) is bonded in a linear geometry to one O(5) and one O(9) atom. In the fourth H site, H(4) is bonded in a linear geometry to one O(8) and one O(9) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(9) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(3) atom. In the seventh H site, H(7) is bonded in a bent 150 degrees geometry to one O(10) and one O(7) atom. In the eighth H site, H(8) is bonded in a distorted single-bond geometry to one O(1) and one O(10) atom. There are two inequivalent S sites. In the first S site, S(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(5), and one O(7) atom. In the second S site, S(2) is bonded in a tetrahedral geometry to one O(2), one O(4), one O(6), and one O(8) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one H(8) and one S(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one S(2) atom. In the third O site, O(3) is bonded in a water-like geometry to one H(6) and one S(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one H(1) and one S(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one H(3) and one S(1) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one H(1) and one S(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one H(7) and one S(1) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one H(2), one H(4), and one S(2) atom. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one H(3), one H(4), and one H(5) atom. In the tenth O site, O(10) is bonded in a trigonal non-coplanar geometry to one H(2), one H(7), and one H(8) atom.
H4SO5 crystallizes in the monoclinic Pc space group. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(4) and one O(6) atom. The H(1)-O(4) bond length is 1.56 Å. The H(1)-O(6) bond length is 1.02 Å. In the second H site, H(2) is bonded in a linear geometry to one O(10) and one O(8) atom. The H(2)-O(10) bond length is 1.08 Å. The H(2)-O(8) bond length is 1.42 Å. In the third H site, H(3) is bonded in a linear geometry to one O(5) and one O(9) atom. The H(3)-O(5) bond length is 1.62 Å. The H(3)-O(9) bond length is 1.02 Å. In the fourth H site, H(4) is bonded in a linear geometry to one O(8) and one O(9) atom. The H(4)-O(8) bond length is 1.54 Å. The H(4)-O(9) bond length is 1.03 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(9) atom. The H(5)-O(9) bond length is 1.00 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(3) atom. The H(6)-O(3) bond length is 0.99 Å. In the seventh H site, H(7) is bonded in a bent 150 degrees geometry to one O(10) and one O(7) atom. The H(7)-O(10) bond length is 1.04 Å. The H(7)-O(7) bond length is 1.51 Å. In the eighth H site, H(8) is bonded in a distorted single-bond geometry to one O(1) and one O(10) atom. The H(8)-O(1) bond length is 1.56 Å. The H(8)-O(10) bond length is 1.02 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(5), and one O(7) atom. The S(1)-O(1) bond length is 1.45 Å. The S(1)-O(3) bond length is 1.60 Å. The S(1)-O(5) bond length is 1.49 Å. The S(1)-O(7) bond length is 1.46 Å. In the second S site, S(2) is bonded in a tetrahedral geometry to one O(2), one O(4), one O(6), and one O(8) atom. The S(2)-O(2) bond length is 1.44 Å. The S(2)-O(4) bond length is 1.46 Å. The S(2)-O(6) bond length is 1.58 Å. The S(2)-O(8) bond length is 1.53 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one H(8) and one S(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one S(2) atom. In the third O site, O(3) is bonded in a water-like geometry to one H(6) and one S(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one H(1) and one S(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one H(3) and one S(1) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one H(1) and one S(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one H(7) and one S(1) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one H(2), one H(4), and one S(2) atom. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one H(3), one H(4), and one H(5) atom. In the tenth O site, O(10) is bonded in a trigonal non-coplanar geometry to one H(2), one H(7), and one H(8) atom.