LaTa2NO5 crystallizes in the monoclinic Pc space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(2), one O(4), one O(5), one O(6), one O(8), and one O(9) atom. In the second La site, La(2) is bonded in a 8-coordinate geometry to one N(1), one N(2), one O(1), one O(10), one O(2), one O(3), one O(7), and one O(9) atom. There are four inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(10), one O(3), one O(4), one O(6), and one O(7) atom to form a mixture of corner and edge-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 27-46°. In the second Ta site, Ta(2) is bonded to one N(1), one O(2), one O(3), one O(4), one O(5), and one O(9) atom to form TaNO5 octahedra that share corners with two equivalent Ta(4)N2O4 octahedra, corners with two equivalent Ta(1)O6 octahedra, and  an edgeedge with one Ta(4)N2O4 octahedra. The corner-sharing octahedral tilt angles range from 27-48°. In the third Ta site, Ta(3) is bonded to one N(2), one O(1), one O(10), one O(6), one O(7), and one O(8) atom to form TaNO5 octahedra that share corners with two equivalent Ta(4)N2O4 octahedra, corners with two equivalent Ta(1)O6 octahedra, and  an edgeedge with one Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-46°. In the fourth Ta site, Ta(4) is bonded to one N(1), one N(2), one O(2), one O(5), one O(8), and one O(9) atom to form a mixture of corner and edge-sharing TaN2O4 octahedra. The corner-sharing octahedral tilt angles range from 29-48°. There are two inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one La(2), one Ta(2), and one Ta(4) atom. In the second N site, N(2) is bonded in a 3-coordinate geometry to one La(2), one Ta(3), and one Ta(4) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one La(1), one La(2), one Ta(1), and one Ta(3) atom to form a mixture of distorted corner and edge-sharing OLa2Ta2 tetrahedra. In the second O site, O(2) is bonded to one La(1), one La(2), one Ta(2), and one Ta(4) atom to form a mixture of distorted corner and edge-sharing OLa2Ta2 tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to one La(2), one Ta(1), and one Ta(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one La(1), one Ta(1), and one Ta(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one La(1), one Ta(2), and one Ta(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one La(1), one Ta(1), and one Ta(3) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one La(2), one Ta(1), and one Ta(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one La(1), one Ta(3), and one Ta(4) atom. In the ninth O site, O(9) is bonded to one La(1), one La(2), one Ta(2), and one Ta(4) atom to form a mixture of distorted corner and edge-sharing OLa2Ta2 tetrahedra. In the tenth O site, O(10) is bonded to one La(1), one La(2), one Ta(1), and one Ta(3) atom to form a mixture of distorted corner and edge-sharing OLa2Ta2 tetrahedra.
LaTa2NO5 crystallizes in the monoclinic Pc space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(2), one O(4), one O(5), one O(6), one O(8), and one O(9) atom. The La(1)-O(1) bond length is 2.57 Å. The La(1)-O(10) bond length is 2.51 Å. The La(1)-O(2) bond length is 2.49 Å. The La(1)-O(4) bond length is 2.57 Å. The La(1)-O(5) bond length is 2.62 Å. The La(1)-O(6) bond length is 2.70 Å. The La(1)-O(8) bond length is 2.44 Å. The La(1)-O(9) bond length is 2.45 Å. In the second La site, La(2) is bonded in a 8-coordinate geometry to one N(1), one N(2), one O(1), one O(10), one O(2), one O(3), one O(7), and one O(9) atom. The La(2)-N(1) bond length is 2.56 Å. The La(2)-N(2) bond length is 2.51 Å. The La(2)-O(1) bond length is 2.59 Å. The La(2)-O(10) bond length is 2.60 Å. The La(2)-O(2) bond length is 2.53 Å. The La(2)-O(3) bond length is 2.53 Å. The La(2)-O(7) bond length is 2.68 Å. The La(2)-O(9) bond length is 2.49 Å. There are four inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(10), one O(3), one O(4), one O(6), and one O(7) atom to form a mixture of corner and edge-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 27-46°. The Ta(1)-O(1) bond length is 2.01 Å. The Ta(1)-O(10) bond length is 2.16 Å. The Ta(1)-O(3) bond length is 1.99 Å. The Ta(1)-O(4) bond length is 1.99 Å. The Ta(1)-O(6) bond length is 2.01 Å. The Ta(1)-O(7) bond length is 1.93 Å. In the second Ta site, Ta(2) is bonded to one N(1), one O(2), one O(3), one O(4), one O(5), and one O(9) atom to form TaNO5 octahedra that share corners with two equivalent Ta(4)N2O4 octahedra, corners with two equivalent Ta(1)O6 octahedra, and  an edgeedge with one Ta(4)N2O4 octahedra. The corner-sharing octahedral tilt angles range from 27-48°. The Ta(2)-N(1) bond length is 1.89 Å. The Ta(2)-O(2) bond length is 2.03 Å. The Ta(2)-O(3) bond length is 2.02 Å. The Ta(2)-O(4) bond length is 2.06 Å. The Ta(2)-O(5) bond length is 2.02 Å. The Ta(2)-O(9) bond length is 2.25 Å. In the third Ta site, Ta(3) is bonded to one N(2), one O(1), one O(10), one O(6), one O(7), and one O(8) atom to form TaNO5 octahedra that share corners with two equivalent Ta(4)N2O4 octahedra, corners with two equivalent Ta(1)O6 octahedra, and  an edgeedge with one Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-46°. The Ta(3)-N(2) bond length is 1.94 Å. The Ta(3)-O(1) bond length is 2.17 Å. The Ta(3)-O(10) bond length is 2.03 Å. The Ta(3)-O(6) bond length is 1.96 Å. The Ta(3)-O(7) bond length is 2.05 Å. The Ta(3)-O(8) bond length is 2.08 Å. In the fourth Ta site, Ta(4) is bonded to one N(1), one N(2), one O(2), one O(5), one O(8), and one O(9) atom to form a mixture of corner and edge-sharing TaN2O4 octahedra. The corner-sharing octahedral tilt angles range from 29-48°. The Ta(4)-N(1) bond length is 1.99 Å. The Ta(4)-N(2) bond length is 2.01 Å. The Ta(4)-O(2) bond length is 2.19 Å. The Ta(4)-O(5) bond length is 1.96 Å. The Ta(4)-O(8) bond length is 2.05 Å. The Ta(4)-O(9) bond length is 2.09 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one La(2), one Ta(2), and one Ta(4) atom. In the second N site, N(2) is bonded in a 3-coordinate geometry to one La(2), one Ta(3), and one Ta(4) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one La(1), one La(2), one Ta(1), and one Ta(3) atom to form a mixture of distorted corner and edge-sharing OLa2Ta2 tetrahedra. In the second O site, O(2) is bonded to one La(1), one La(2), one Ta(2), and one Ta(4) atom to form a mixture of distorted corner and edge-sharing OLa2Ta2 tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to one La(2), one Ta(1), and one Ta(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one La(1), one Ta(1), and one Ta(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one La(1), one Ta(2), and one Ta(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one La(1), one Ta(1), and one Ta(3) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one La(2), one Ta(1), and one Ta(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one La(1), one Ta(3), and one Ta(4) atom. In the ninth O site, O(9) is bonded to one La(1), one La(2), one Ta(2), and one Ta(4) atom to form a mixture of distorted corner and edge-sharing OLa2Ta2 tetrahedra. In the tenth O site, O(10) is bonded to one La(1), one La(2), one Ta(1), and one Ta(3) atom to form a mixture of distorted corner and edge-sharing OLa2Ta2 tetrahedra.