Nd3Si2O8Cl crystallizes in the monoclinic C2/c space group. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 9-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), three equivalent O(3), and one Cl(1) atom. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to two equivalent O(1), two equivalent O(2), four equivalent O(4), and one Cl(1) atom. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Nd(2), two equivalent Nd(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Nd(2), two equivalent Nd(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to three equivalent Nd(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Nd(1), two equivalent Nd(2), and one Si(1) atom. Cl(1) is bonded in a distorted T-shaped geometry to one Nd(2) and two equivalent Nd(1) atoms.
Nd3Si2O8Cl crystallizes in the monoclinic C2/c space group. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 9-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), three equivalent O(3), and one Cl(1) atom. The Nd(1)-O(4) bond length is 2.49 Å. There is one shorter (2.44 Å) and one longer (2.68 Å) Nd(1)-O(1) bond length. There is one shorter (2.42 Å) and one longer (2.83 Å) Nd(1)-O(2) bond length. There are a spread of Nd(1)-O(3) bond distances ranging from 2.42-2.59 Å. The Nd(1)-Cl(1) bond length is 2.85 Å. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to two equivalent O(1), two equivalent O(2), four equivalent O(4), and one Cl(1) atom. Both Nd(2)-O(1) bond lengths are 2.52 Å. Both Nd(2)-O(2) bond lengths are 2.57 Å. There are two shorter (2.57 Å) and two longer (2.66 Å) Nd(2)-O(4) bond lengths. The Nd(2)-Cl(1) bond length is 2.89 Å. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Si(1)-O(1) bond length is 1.62 Å. The Si(1)-O(2) bond length is 1.61 Å. The Si(1)-O(3) bond length is 1.64 Å. The Si(1)-O(4) bond length is 1.64 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Nd(2), two equivalent Nd(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Nd(2), two equivalent Nd(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to three equivalent Nd(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Nd(1), two equivalent Nd(2), and one Si(1) atom. Cl(1) is bonded in a distorted T-shaped geometry to one Nd(2) and two equivalent Nd(1) atoms.