Pr2Cu(GeO4)2 crystallizes in the monoclinic Cm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. In the second Pr site, Pr(2) 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(7), one O(8), and one O(9) atom. Cu(1) is bonded in a 4-coordinate geometry to one O(10), one O(2), one O(4), and one O(8) atom. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a tetrahedral geometry to one O(6), one O(9), and two equivalent O(2) atoms. In the second Ge site, Ge(2) is bonded to one O(1), one O(10), one O(4), one O(5), and one O(8) atom to form corner-sharing GeO5 trigonal bipyramids. In the third Ge site, Ge(3) is bonded to one O(3), one O(7), and two equivalent O(5) atoms to form corner-sharing GeO4 tetrahedra. There are ten inequivalent O sites. In the first O site, O(9) is bonded in a distorted trigonal planar geometry to two equivalent Pr(2) and one Ge(1) atom. In the second O site, O(10) is bonded to one Pr(1), one Pr(2), one Cu(1), and one Ge(2) atom to form a mixture of distorted edge and corner-sharing OPr2CuGe trigonal pyramids. In the third O site, O(1) is bonded in a 1-coordinate geometry to one Pr(1), one Pr(2), and one Ge(2) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to one Pr(1), one Pr(2), one Cu(1), and one Ge(1) atom. In the fifth O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Pr(1) and one Ge(3) atom. In the sixth O site, O(4) is bonded to one Pr(1), one Pr(2), one Cu(1), and one Ge(2) atom to form a mixture of distorted edge and corner-sharing OPr2CuGe trigonal pyramids. In the seventh O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Pr(1), one Pr(2), one Ge(2), and one Ge(3) atom. In the eighth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Pr(1) and one Ge(1) atom. In the ninth O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Pr(2) and one Ge(3) atom. In the tenth O site, O(8) is bonded to one Pr(1), one Pr(2), one Cu(1), and one Ge(2) atom to form a mixture of distorted edge and corner-sharing OPr2CuGe trigonal pyramids.
Pr2Cu(GeO4)2 crystallizes in the monoclinic Cm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. The Pr(1)-O(1) bond length is 2.55 Å. The Pr(1)-O(10) bond length is 2.37 Å. The Pr(1)-O(2) bond length is 2.92 Å. The Pr(1)-O(3) bond length is 2.39 Å. The Pr(1)-O(4) bond length is 2.52 Å. The Pr(1)-O(5) bond length is 2.79 Å. The Pr(1)-O(6) bond length is 2.39 Å. The Pr(1)-O(8) bond length is 2.48 Å. In the second Pr site, Pr(2) 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(7), one O(8), and one O(9) atom. The Pr(2)-O(1) bond length is 2.47 Å. The Pr(2)-O(10) bond length is 2.44 Å. The Pr(2)-O(2) bond length is 2.70 Å. The Pr(2)-O(4) bond length is 2.53 Å. The Pr(2)-O(5) bond length is 2.84 Å. The Pr(2)-O(7) bond length is 2.41 Å. The Pr(2)-O(8) bond length is 2.53 Å. The Pr(2)-O(9) bond length is 2.39 Å. Cu(1) is bonded in a 4-coordinate geometry to one O(10), one O(2), one O(4), and one O(8) atom. The Cu(1)-O(10) bond length is 1.90 Å. The Cu(1)-O(2) bond length is 2.00 Å. The Cu(1)-O(4) bond length is 2.02 Å. The Cu(1)-O(8) bond length is 2.10 Å. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a tetrahedral geometry to one O(6), one O(9), and two equivalent O(2) atoms. The Ge(1)-O(6) bond length is 1.78 Å. The Ge(1)-O(9) bond length is 1.79 Å. Both Ge(1)-O(2) bond lengths are 1.80 Å. In the second Ge site, Ge(2) is bonded to one O(1), one O(10), one O(4), one O(5), and one O(8) atom to form corner-sharing GeO5 trigonal bipyramids. The Ge(2)-O(1) bond length is 1.78 Å. The Ge(2)-O(10) bond length is 1.98 Å. The Ge(2)-O(4) bond length is 1.81 Å. The Ge(2)-O(5) bond length is 2.00 Å. The Ge(2)-O(8) bond length is 1.82 Å. In the third Ge site, Ge(3) is bonded to one O(3), one O(7), and two equivalent O(5) atoms to form corner-sharing GeO4 tetrahedra. The Ge(3)-O(3) bond length is 1.77 Å. The Ge(3)-O(7) bond length is 1.77 Å. Both Ge(3)-O(5) bond lengths are 1.81 Å. There are ten inequivalent O sites. In the first O site, O(9) is bonded in a distorted trigonal planar geometry to two equivalent Pr(2) and one Ge(1) atom. In the second O site, O(10) is bonded to one Pr(1), one Pr(2), one Cu(1), and one Ge(2) atom to form a mixture of distorted edge and corner-sharing OPr2CuGe trigonal pyramids. In the third O site, O(1) is bonded in a 1-coordinate geometry to one Pr(1), one Pr(2), and one Ge(2) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to one Pr(1), one Pr(2), one Cu(1), and one Ge(1) atom. In the fifth O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Pr(1) and one Ge(3) atom. In the sixth O site, O(4) is bonded to one Pr(1), one Pr(2), one Cu(1), and one Ge(2) atom to form a mixture of distorted edge and corner-sharing OPr2CuGe trigonal pyramids. In the seventh O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Pr(1), one Pr(2), one Ge(2), and one Ge(3) atom. In the eighth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Pr(1) and one Ge(1) atom. In the ninth O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Pr(2) and one Ge(3) atom. In the tenth O site, O(8) is bonded to one Pr(1), one Pr(2), one Cu(1), and one Ge(2) atom to form a mixture of distorted edge and corner-sharing OPr2CuGe trigonal pyramids.