K2MnH4(O7I2)2 crystallizes in the monoclinic C2 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent O(4), two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms. Mn(1) is bonded in an octahedral geometry to one O(1), one O(2), two equivalent O(3), and two equivalent O(6) atoms. There are two inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(2) and one O(4) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(1) and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(7) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one I(2) atom. In the second O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one K(2), one H(2), and one I(1) atom. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(1) and two equivalent H(2) atoms. In the fourth O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(1) and two equivalent H(1) atoms. In the fifth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1), one Mn(1), and one I(2) atom. In the sixth O site, O(4) is bonded in a 3-coordinate geometry to one K(2), one H(1), and one I(2) atom. In the seventh O site, O(5) is bonded in a 4-coordinate geometry to one K(1), one K(2), one I(1), and one I(2) atom. In the eighth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one Mn(1), and one I(1) atom. There are two inequivalent I sites. In the first I site, I(1) is bonded in a distorted trigonal non-coplanar geometry to one O(5), one O(6), and one O(8) atom. In the second I site, I(2) is bonded in a 3-coordinate geometry to one O(3), one O(4), one O(5), and one O(7) atom.
K2MnH4(O7I2)2 crystallizes in the monoclinic C2 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. Both K(1)-O(3) bond lengths are 3.20 Å. Both K(1)-O(5) bond lengths are 2.84 Å. Both K(1)-O(6) bond lengths are 2.94 Å. Both K(1)-O(7) bond lengths are 2.79 Å. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent O(4), two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms. Both K(2)-O(4) bond lengths are 3.00 Å. Both K(2)-O(5) bond lengths are 2.87 Å. Both K(2)-O(7) bond lengths are 2.83 Å. Both K(2)-O(8) bond lengths are 2.88 Å. Mn(1) is bonded in an octahedral geometry to one O(1), one O(2), two equivalent O(3), and two equivalent O(6) atoms. The Mn(1)-O(1) bond length is 2.16 Å. The Mn(1)-O(2) bond length is 2.11 Å. Both Mn(1)-O(3) bond lengths are 2.23 Å. Both Mn(1)-O(6) bond lengths are 2.25 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(2) and one O(4) atom. The H(1)-O(2) bond length is 1.00 Å. The H(1)-O(4) bond length is 1.66 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(1) and one O(8) atom. The H(2)-O(1) bond length is 1.00 Å. The H(2)-O(8) bond length is 1.68 Å. There are eight inequivalent O sites. In the first O site, O(7) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one I(2) atom. The O(7)-I(2) bond length is 1.84 Å. In the second O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one K(2), one H(2), and one I(1) atom. The O(8)-I(1) bond length is 1.85 Å. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(1) and two equivalent H(2) atoms. In the fourth O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(1) and two equivalent H(1) atoms. In the fifth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1), one Mn(1), and one I(2) atom. The O(3)-I(2) bond length is 1.86 Å. In the sixth O site, O(4) is bonded in a 3-coordinate geometry to one K(2), one H(1), and one I(2) atom. The O(4)-I(2) bond length is 1.83 Å. In the seventh O site, O(5) is bonded in a 4-coordinate geometry to one K(1), one K(2), one I(1), and one I(2) atom. The O(5)-I(1) bond length is 1.84 Å. The O(5)-I(2) bond length is 2.73 Å. In the eighth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one Mn(1), and one I(1) atom. The O(6)-I(1) bond length is 1.85 Å. There are two inequivalent I sites. In the first I site, I(1) is bonded in a distorted trigonal non-coplanar geometry to one O(5), one O(6), and one O(8) atom. In the second I site, I(2) is bonded in a 3-coordinate geometry to one O(3), one O(4), one O(5), and one O(7) atom.