NaVSiCO7 crystallizes in the monoclinic P2_1 space group. Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(5), and one O(6) atom. V(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form VO6 octahedra that share corners with four equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form SiO4 tetrahedra that share corners with four equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-38°. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Na(1), one V(1), and one C(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(1), one V(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one V(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Na(1), one V(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one V(1), and one Si(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one V(1) and one Si(1) atom.
NaVSiCO7 crystallizes in the monoclinic P2_1 space group. Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(5), and one O(6) atom. The Na(1)-O(1) bond length is 2.21 Å. The Na(1)-O(2) bond length is 2.47 Å. The Na(1)-O(3) bond length is 2.36 Å. The Na(1)-O(5) bond length is 2.55 Å. The Na(1)-O(6) bond length is 2.49 Å. V(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form VO6 octahedra that share corners with four equivalent Si(1)O4 tetrahedra. The V(1)-O(2) bond length is 1.97 Å. The V(1)-O(3) bond length is 2.02 Å. The V(1)-O(4) bond length is 1.81 Å. The V(1)-O(5) bond length is 1.97 Å. The V(1)-O(6) bond length is 1.83 Å. The V(1)-O(7) bond length is 1.84 Å. Si(1) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form SiO4 tetrahedra that share corners with four equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-38°. The Si(1)-O(4) bond length is 1.65 Å. The Si(1)-O(5) bond length is 1.61 Å. The Si(1)-O(6) bond length is 1.65 Å. The Si(1)-O(7) bond length is 1.65 Å. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The C(1)-O(1) bond length is 1.23 Å. The C(1)-O(2) bond length is 1.34 Å. The C(1)-O(3) bond length is 1.33 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Na(1), one V(1), and one C(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(1), one V(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one V(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Na(1), one V(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one V(1), and one Si(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one V(1) and one Si(1) atom.