UPbSiH2O7 crystallizes in the monoclinic P2_1/c space group. U(1) is bonded in a 7-coordinate geometry to one O(2), one O(5), one O(6), two equivalent O(1), and two equivalent O(3) atoms. Pb(1) is bonded in a 4-coordinate geometry to one O(6), one O(7), and two equivalent O(4) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(4), and one O(5) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(7) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(7) atom. There are seven inequivalent O sites. In the first O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Pb(1) and one Si(1) atom. In the second O site, O(5) is bonded in a bent 150 degrees geometry to one U(1) and one Si(1) atom. In the third O site, O(6) is bonded in a single-bond geometry to one U(1) and one Pb(1) atom. In the fourth O site, O(7) is bonded in a water-like geometry to one Pb(1), one H(1), and one H(2) atom. In the fifth O site, O(1) is bonded in a 2-coordinate geometry to two equivalent U(1) and one Si(1) atom. In the sixth O site, O(2) is bonded in a single-bond geometry to one U(1) atom. In the seventh O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent U(1) and one Si(1) atom.
UPbSiH2O7 crystallizes in the monoclinic P2_1/c space group. U(1) is bonded in a 7-coordinate geometry to one O(2), one O(5), one O(6), two equivalent O(1), and two equivalent O(3) atoms. The U(1)-O(2) bond length is 1.87 Å. The U(1)-O(5) bond length is 2.21 Å. The U(1)-O(6) bond length is 1.86 Å. There is one shorter (2.25 Å) and one longer (2.78 Å) U(1)-O(1) bond length. Both U(1)-O(3) bond lengths are 2.37 Å. Pb(1) is bonded in a 4-coordinate geometry to one O(6), one O(7), and two equivalent O(4) atoms. The Pb(1)-O(6) bond length is 2.74 Å. The Pb(1)-O(7) bond length is 2.56 Å. There is one shorter (2.38 Å) and one longer (2.39 Å) Pb(1)-O(4) bond length. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(4), and one O(5) atom. The Si(1)-O(1) bond length is 1.65 Å. The Si(1)-O(3) bond length is 1.67 Å. The Si(1)-O(4) bond length is 1.64 Å. The Si(1)-O(5) bond length is 1.64 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(7) atom. The H(1)-O(7) bond length is 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(7) atom. The H(2)-O(7) bond length is 0.98 Å. There are seven inequivalent O sites. In the first O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Pb(1) and one Si(1) atom. In the second O site, O(5) is bonded in a bent 150 degrees geometry to one U(1) and one Si(1) atom. In the third O site, O(6) is bonded in a single-bond geometry to one U(1) and one Pb(1) atom. In the fourth O site, O(7) is bonded in a water-like geometry to one Pb(1), one H(1), and one H(2) atom. In the fifth O site, O(1) is bonded in a 2-coordinate geometry to two equivalent U(1) and one Si(1) atom. In the sixth O site, O(2) is bonded in a single-bond geometry to one U(1) atom. In the seventh O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent U(1) and one Si(1) atom.