Ta2CrNO5 is Hydrophilite-derived structured and crystallizes in the monoclinic Cm space group. There are four inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one N(2), one O(1), one O(2), one O(3), and two equivalent O(5) atoms to form TaNO5 octahedra that share corners with four equivalent Ta(3)O6 octahedra, corners with four equivalent Cr(1)NO5 octahedra,  an edgeedge with one Ta(2)N2O4 octahedra, and  an edgeedge with one Cr(2)NO5 octahedra. The corner-sharing octahedral tilt angles range from 44-54°. In the second Ta site, Ta(2) is bonded to one N(1), one N(2), one O(1), one O(4), and two equivalent O(6) atoms to form TaN2O4 octahedra that share corners with four equivalent Ta(4)NO5 octahedra, corners with four equivalent Cr(1)NO5 octahedra,  an edgeedge with one Ta(1)NO5 octahedra, and  an edgeedge with one Cr(2)NO5 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. In the third Ta site, Ta(3) is bonded to one O(2), one O(3), two equivalent O(5), and two equivalent O(7) atoms to form TaO6 octahedra that share corners with four equivalent Ta(1)NO5 octahedra, corners with four equivalent Cr(2)NO5 octahedra,  an edgeedge with one Ta(4)NO5 octahedra, and  an edgeedge with one Cr(1)NO5 octahedra. The corner-sharing octahedral tilt angles range from 44-52°. In the fourth Ta site, Ta(4) is bonded to one N(1), one O(4), two equivalent O(6), and two equivalent O(7) atoms to form TaNO5 octahedra that share corners with four equivalent Ta(2)N2O4 octahedra, corners with four equivalent Cr(2)NO5 octahedra,  an edgeedge with one Ta(3)O6 octahedra, and  an edgeedge with one Cr(1)NO5 octahedra. The corner-sharing octahedral tilt angles range from 48-51°. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one N(2), one O(1), two equivalent O(5), and two equivalent O(6) atoms to form CrNO5 octahedra that share corners with four equivalent Ta(2)N2O4 octahedra, corners with four equivalent Ta(1)NO5 octahedra,  an edgeedge with one Ta(4)NO5 octahedra, and  an edgeedge with one Ta(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-54°. In the second Cr site, Cr(2) is bonded to one N(1), one O(2), one O(3), one O(4), and two equivalent O(7) atoms to form CrNO5 octahedra that share corners with four equivalent Ta(4)NO5 octahedra, corners with four equivalent Ta(3)O6 octahedra,  an edgeedge with one Ta(2)N2O4 octahedra, and  an edgeedge with one Ta(1)NO5 octahedra. The corner-sharing octahedral tilt angles range from 48-51°. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(4), and one Cr(2) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(2), and one Cr(1) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(2), and one Cr(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(3), and one Cr(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Ta(1), one Ta(3), and one Cr(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(4), and one Cr(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(3), and one Cr(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(4), and one Cr(1) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Ta(3), one Ta(4), and one Cr(2) atom.
Ta2CrNO5 is Hydrophilite-derived structured and crystallizes in the monoclinic Cm space group. There are four inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one N(2), one O(1), one O(2), one O(3), and two equivalent O(5) atoms to form TaNO5 octahedra that share corners with four equivalent Ta(3)O6 octahedra, corners with four equivalent Cr(1)NO5 octahedra,  an edgeedge with one Ta(2)N2O4 octahedra, and  an edgeedge with one Cr(2)NO5 octahedra. The corner-sharing octahedral tilt angles range from 44-54°. The Ta(1)-N(2) bond length is 1.90 Å. The Ta(1)-O(1) bond length is 2.00 Å. The Ta(1)-O(2) bond length is 2.21 Å. The Ta(1)-O(3) bond length is 2.02 Å. Both Ta(1)-O(5) bond lengths are 2.05 Å. In the second Ta site, Ta(2) is bonded to one N(1), one N(2), one O(1), one O(4), and two equivalent O(6) atoms to form TaN2O4 octahedra that share corners with four equivalent Ta(4)NO5 octahedra, corners with four equivalent Cr(1)NO5 octahedra,  an edgeedge with one Ta(1)NO5 octahedra, and  an edgeedge with one Cr(2)NO5 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. The Ta(2)-N(1) bond length is 2.02 Å. The Ta(2)-N(2) bond length is 2.06 Å. The Ta(2)-O(1) bond length is 2.13 Å. The Ta(2)-O(4) bond length is 1.94 Å. Both Ta(2)-O(6) bond lengths are 2.05 Å. In the third Ta site, Ta(3) is bonded to one O(2), one O(3), two equivalent O(5), and two equivalent O(7) atoms to form TaO6 octahedra that share corners with four equivalent Ta(1)NO5 octahedra, corners with four equivalent Cr(2)NO5 octahedra,  an edgeedge with one Ta(4)NO5 octahedra, and  an edgeedge with one Cr(1)NO5 octahedra. The corner-sharing octahedral tilt angles range from 44-52°. The Ta(3)-O(2) bond length is 1.96 Å. The Ta(3)-O(3) bond length is 2.09 Å. Both Ta(3)-O(5) bond lengths are 1.99 Å. Both Ta(3)-O(7) bond lengths are 2.01 Å. In the fourth Ta site, Ta(4) is bonded to one N(1), one O(4), two equivalent O(6), and two equivalent O(7) atoms to form TaNO5 octahedra that share corners with four equivalent Ta(2)N2O4 octahedra, corners with four equivalent Cr(2)NO5 octahedra,  an edgeedge with one Ta(3)O6 octahedra, and  an edgeedge with one Cr(1)NO5 octahedra. The corner-sharing octahedral tilt angles range from 48-51°. The Ta(4)-N(1) bond length is 1.90 Å. The Ta(4)-O(4) bond length is 2.20 Å. Both Ta(4)-O(6) bond lengths are 2.00 Å. Both Ta(4)-O(7) bond lengths are 2.05 Å. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one N(2), one O(1), two equivalent O(5), and two equivalent O(6) atoms to form CrNO5 octahedra that share corners with four equivalent Ta(2)N2O4 octahedra, corners with four equivalent Ta(1)NO5 octahedra,  an edgeedge with one Ta(4)NO5 octahedra, and  an edgeedge with one Ta(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-54°. The Cr(1)-N(2) bond length is 2.03 Å. The Cr(1)-O(1) bond length is 2.07 Å. Both Cr(1)-O(5) bond lengths are 2.07 Å. Both Cr(1)-O(6) bond lengths are 2.04 Å. In the second Cr site, Cr(2) is bonded to one N(1), one O(2), one O(3), one O(4), and two equivalent O(7) atoms to form CrNO5 octahedra that share corners with four equivalent Ta(4)NO5 octahedra, corners with four equivalent Ta(3)O6 octahedra,  an edgeedge with one Ta(2)N2O4 octahedra, and  an edgeedge with one Ta(1)NO5 octahedra. The corner-sharing octahedral tilt angles range from 48-51°. The Cr(2)-N(1) bond length is 2.03 Å. The Cr(2)-O(2) bond length is 2.04 Å. The Cr(2)-O(3) bond length is 2.06 Å. The Cr(2)-O(4) bond length is 2.04 Å. Both Cr(2)-O(7) bond lengths are 2.07 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(4), and one Cr(2) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(2), and one Cr(1) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(2), and one Cr(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(3), and one Cr(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Ta(1), one Ta(3), and one Cr(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(4), and one Cr(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(3), and one Cr(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(4), and one Cr(1) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Ta(3), one Ta(4), and one Cr(2) atom.