Eu2P3(HO3)3 crystallizes in the triclinic P-1 space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), one O(7), one O(8), and two equivalent O(3) atoms. In the second Eu site, Eu(2) is bonded to one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form distorted EuO7 pentagonal bipyramids that share corners with two equivalent P(3)HO3 tetrahedra, corners with three equivalent P(2)HO3 tetrahedra, and  an edgeedge with one P(1)HO3 tetrahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one H(1), one O(1), one O(7), and one O(8) atom to form distorted PHO3 tetrahedra that share  an edgeedge with one Eu(2)O7 pentagonal bipyramid. In the second P site, P(2) is bonded to one H(2), one O(2), one O(4), and one O(5) atom to form distorted PHO3 tetrahedra that share corners with three equivalent Eu(2)O7 pentagonal bipyramids. In the third P site, P(3) is bonded to one H(3), one O(3), one O(6), and one O(9) atom to form distorted PHO3 tetrahedra that share corners with two equivalent Eu(2)O7 pentagonal bipyramids. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one P(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one P(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one P(3) atom. There are nine inequivalent O sites. In the first O site, O(9) is bonded in a bent 150 degrees geometry to one Eu(2) and one P(3) atom. In the second O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and one P(1) atom. In the third O site, O(2) is bonded in a bent 150 degrees geometry to one Eu(2) and one P(2) atom. In the fourth O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Eu(1) and one P(3) atom. In the fifth O site, O(4) is bonded in a 3-coordinate geometry to one Eu(1), one Eu(2), and one P(2) atom. In the sixth O site, O(5) is bonded in a 3-coordinate geometry to one Eu(1), one Eu(2), and one P(2) atom. In the seventh O site, O(6) is bonded in a 3-coordinate geometry to one Eu(1), one Eu(2), and one P(3) atom. In the eighth O site, O(7) is bonded in a 3-coordinate geometry to one Eu(1), one Eu(2), and one P(1) atom. In the ninth O site, O(8) is bonded in a 3-coordinate geometry to one Eu(1), one Eu(2), and one P(1) atom.
Eu2P3(HO3)3 crystallizes in the triclinic P-1 space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), one O(7), one O(8), and two equivalent O(3) atoms. The Eu(1)-O(1) bond length is 2.34 Å. The Eu(1)-O(4) bond length is 2.59 Å. The Eu(1)-O(5) bond length is 2.54 Å. The Eu(1)-O(6) bond length is 2.80 Å. The Eu(1)-O(7) bond length is 2.39 Å. The Eu(1)-O(8) bond length is 2.41 Å. There is one shorter (2.46 Å) and one longer (2.58 Å) Eu(1)-O(3) bond length. In the second Eu site, Eu(2) is bonded to one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form distorted EuO7 pentagonal bipyramids that share corners with two equivalent P(3)HO3 tetrahedra, corners with three equivalent P(2)HO3 tetrahedra, and  an edgeedge with one P(1)HO3 tetrahedra. The Eu(2)-O(2) bond length is 2.30 Å. The Eu(2)-O(4) bond length is 2.43 Å. The Eu(2)-O(5) bond length is 2.41 Å. The Eu(2)-O(6) bond length is 2.44 Å. The Eu(2)-O(7) bond length is 2.57 Å. The Eu(2)-O(8) bond length is 2.59 Å. The Eu(2)-O(9) bond length is 2.33 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded to one H(1), one O(1), one O(7), and one O(8) atom to form distorted PHO3 tetrahedra that share  an edgeedge with one Eu(2)O7 pentagonal bipyramid. The P(1)-H(1) bond length is 1.40 Å. The P(1)-O(1) bond length is 1.52 Å. The P(1)-O(7) bond length is 1.55 Å. The P(1)-O(8) bond length is 1.55 Å. In the second P site, P(2) is bonded to one H(2), one O(2), one O(4), and one O(5) atom to form distorted PHO3 tetrahedra that share corners with three equivalent Eu(2)O7 pentagonal bipyramids. The P(2)-H(2) bond length is 1.41 Å. The P(2)-O(2) bond length is 1.52 Å. The P(2)-O(4) bond length is 1.55 Å. The P(2)-O(5) bond length is 1.54 Å. In the third P site, P(3) is bonded to one H(3), one O(3), one O(6), and one O(9) atom to form distorted PHO3 tetrahedra that share corners with two equivalent Eu(2)O7 pentagonal bipyramids. The P(3)-H(3) bond length is 1.40 Å. The P(3)-O(3) bond length is 1.55 Å. The P(3)-O(6) bond length is 1.55 Å. The P(3)-O(9) bond length is 1.53 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one P(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one P(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one P(3) atom. There are nine inequivalent O sites. In the first O site, O(9) is bonded in a bent 150 degrees geometry to one Eu(2) and one P(3) atom. In the second O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and one P(1) atom. In the third O site, O(2) is bonded in a bent 150 degrees geometry to one Eu(2) and one P(2) atom. In the fourth O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Eu(1) and one P(3) atom. In the fifth O site, O(4) is bonded in a 3-coordinate geometry to one Eu(1), one Eu(2), and one P(2) atom. In the sixth O site, O(5) is bonded in a 3-coordinate geometry to one Eu(1), one Eu(2), and one P(2) atom. In the seventh O site, O(6) is bonded in a 3-coordinate geometry to one Eu(1), one Eu(2), and one P(3) atom. In the eighth O site, O(7) is bonded in a 3-coordinate geometry to one Eu(1), one Eu(2), and one P(1) atom. In the ninth O site, O(8) is bonded in a 3-coordinate geometry to one Eu(1), one Eu(2), and one P(1) atom.