KFe2H(SeO3)4 crystallizes in the monoclinic P2 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(1), two equivalent O(2), two equivalent O(3), and two equivalent O(8) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent O(11), two equivalent O(4), and two equivalent O(5) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in an octahedral geometry to one O(11), one O(12), one O(2), one O(5), one O(8), and one O(9) atom. In the second Fe site, Fe(2) is bonded in an octahedral geometry to one O(1), one O(10), one O(3), one O(4), one O(6), and one O(7) atom. H(1) is bonded in a distorted linear geometry to one O(12) and one O(6) atom. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(7), one O(8), and one O(9) atom. In the fourth Se site, Se(4) is bonded in a trigonal non-coplanar geometry to one O(10), one O(11), and one O(12) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one K(1), one Fe(2), and one Se(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one K(1), one Fe(1), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1), one Fe(2), and one Se(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one K(2), one Fe(2), and one Se(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one K(2), one Fe(1), and one Se(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Fe(2), one H(1), and one Se(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Fe(2) and one Se(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one K(1), one Fe(1), and one Se(3) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Fe(1) and one Se(3) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Fe(2) and one Se(4) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one K(2), one Fe(1), and one Se(4) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Fe(1), one H(1), and one Se(4) atom.
KFe2H(SeO3)4 crystallizes in the monoclinic P2 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(1), two equivalent O(2), two equivalent O(3), and two equivalent O(8) atoms. Both K(1)-O(1) bond lengths are 2.77 Å. Both K(1)-O(2) bond lengths are 2.95 Å. Both K(1)-O(3) bond lengths are 2.98 Å. Both K(1)-O(8) bond lengths are 3.03 Å. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent O(11), two equivalent O(4), and two equivalent O(5) atoms. Both K(2)-O(11) bond lengths are 2.81 Å. Both K(2)-O(4) bond lengths are 2.73 Å. Both K(2)-O(5) bond lengths are 2.98 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in an octahedral geometry to one O(11), one O(12), one O(2), one O(5), one O(8), and one O(9) atom. The Fe(1)-O(11) bond length is 2.08 Å. The Fe(1)-O(12) bond length is 2.18 Å. The Fe(1)-O(2) bond length is 2.02 Å. The Fe(1)-O(5) bond length is 2.05 Å. The Fe(1)-O(8) bond length is 2.02 Å. The Fe(1)-O(9) bond length is 1.96 Å. In the second Fe site, Fe(2) is bonded in an octahedral geometry to one O(1), one O(10), one O(3), one O(4), one O(6), and one O(7) atom. The Fe(2)-O(1) bond length is 2.05 Å. The Fe(2)-O(10) bond length is 2.11 Å. The Fe(2)-O(3) bond length is 1.99 Å. The Fe(2)-O(4) bond length is 2.07 Å. The Fe(2)-O(6) bond length is 2.09 Å. The Fe(2)-O(7) bond length is 2.00 Å. H(1) is bonded in a distorted linear geometry to one O(12) and one O(6) atom. The H(1)-O(12) bond length is 1.03 Å. The H(1)-O(6) bond length is 1.60 Å. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. The Se(1)-O(1) bond length is 1.73 Å. The Se(1)-O(2) bond length is 1.74 Å. The Se(1)-O(3) bond length is 1.74 Å. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. The Se(2)-O(4) bond length is 1.72 Å. The Se(2)-O(5) bond length is 1.74 Å. The Se(2)-O(6) bond length is 1.77 Å. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(7), one O(8), and one O(9) atom. The Se(3)-O(7) bond length is 1.72 Å. The Se(3)-O(8) bond length is 1.74 Å. The Se(3)-O(9) bond length is 1.73 Å. In the fourth Se site, Se(4) is bonded in a trigonal non-coplanar geometry to one O(10), one O(11), and one O(12) atom. The Se(4)-O(10) bond length is 1.70 Å. The Se(4)-O(11) bond length is 1.71 Å. The Se(4)-O(12) bond length is 1.86 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one K(1), one Fe(2), and one Se(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one K(1), one Fe(1), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1), one Fe(2), and one Se(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one K(2), one Fe(2), and one Se(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one K(2), one Fe(1), and one Se(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Fe(2), one H(1), and one Se(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Fe(2) and one Se(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one K(1), one Fe(1), and one Se(3) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Fe(1) and one Se(3) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Fe(2) and one Se(4) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one K(2), one Fe(1), and one Se(4) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Fe(1), one H(1), and one Se(4) atom.