Pr2SiC(NO2)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 9-coordinate geometry to two equivalent N(1), two equivalent N(2), one O(1), one O(2), one O(3), and two equivalent O(4) atoms. In the second Pr site, Pr(2) is bonded in a 8-coordinate geometry to one N(1), one N(2), one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. C(1) is bonded in a linear geometry to one N(1) and one N(2) atom. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one C(1) atom. In the second N site, N(2) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one C(1) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Pr(1), two equivalent Pr(2), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OPr3Si tetrahedra. In the second O site, O(2) is bonded to one Pr(1), two equivalent Pr(2), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OPr3Si trigonal pyramids. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Pr(1), one Pr(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Pr(2), two equivalent Pr(1), and one Si(1) atom.
Pr2SiC(NO2)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 9-coordinate geometry to two equivalent N(1), two equivalent N(2), one O(1), one O(2), one O(3), and two equivalent O(4) atoms. There is one shorter (2.59 Å) and one longer (3.03 Å) Pr(1)-N(1) bond length. There is one shorter (2.73 Å) and one longer (2.85 Å) Pr(1)-N(2) bond length. The Pr(1)-O(1) bond length is 2.62 Å. The Pr(1)-O(2) bond length is 2.56 Å. The Pr(1)-O(3) bond length is 2.55 Å. There is one shorter (2.49 Å) and one longer (2.60 Å) Pr(1)-O(4) bond length. In the second Pr site, Pr(2) is bonded in a 8-coordinate geometry to one N(1), one N(2), one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms. The Pr(2)-N(1) bond length is 2.55 Å. The Pr(2)-N(2) bond length is 2.58 Å. The Pr(2)-O(3) bond length is 2.33 Å. The Pr(2)-O(4) bond length is 2.75 Å. There is one shorter (2.45 Å) and one longer (2.54 Å) Pr(2)-O(1) bond length. There is one shorter (2.50 Å) and one longer (2.55 Å) Pr(2)-O(2) bond length. 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 1.65 Å. The Si(1)-O(2) bond length is 1.67 Å. The Si(1)-O(3) bond length is 1.61 Å. The Si(1)-O(4) bond length is 1.65 Å. C(1) is bonded in a linear geometry to one N(1) and one N(2) atom. The C(1)-N(1) bond length is 1.24 Å. The C(1)-N(2) bond length is 1.24 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one C(1) atom. In the second N site, N(2) is bonded in a distorted single-bond geometry to one Pr(2), two equivalent Pr(1), and one C(1) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Pr(1), two equivalent Pr(2), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OPr3Si tetrahedra. In the second O site, O(2) is bonded to one Pr(1), two equivalent Pr(2), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OPr3Si trigonal pyramids. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Pr(1), one Pr(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Pr(2), two equivalent Pr(1), and one Si(1) atom.