Pr2Mo4O15 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 7-coordinate geometry to one O(1), one O(11), one O(13), one O(15), one O(6), one O(8), and one O(9) atom. In the second Pr site, Pr(2) is bonded in a 8-coordinate geometry to one O(10), one O(13), one O(14), one O(2), one O(3), one O(7), one O(8), and one O(9) atom. There are four inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a tetrahedral geometry to one O(12), one O(2), one O(5), and one O(9) atom. In the second Mo site, Mo(2) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(4), one O(5), and two equivalent O(15) atoms. In the third Mo site, Mo(3) is bonded in a tetrahedral geometry to one O(11), one O(3), one O(7), and one O(8) atom. In the fourth Mo site, Mo(4) is bonded in a tetrahedral geometry to one O(1), one O(13), one O(14), and one O(6) atom. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Pr(1) and one Mo(4) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Pr(2) and one Mo(1) atom. In the third O site, O(3) is bonded in a linear geometry to one Pr(2) and one Mo(3) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one Mo(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Mo(1) and one Mo(2) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Pr(1) and one Mo(4) atom. In the seventh O site, O(7) is bonded in a linear geometry to one Pr(2) and one Mo(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Pr(1), one Pr(2), and one Mo(3) atom. In the ninth O site, O(9) is bonded in a 1-coordinate geometry to one Pr(1), one Pr(2), and one Mo(1) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Pr(2) and one Mo(2) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Pr(1) and one Mo(3) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Mo(1) and one Mo(2) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Pr(1), one Pr(2), and one Mo(4) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Pr(2) and one Mo(4) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Pr(1) and two equivalent Mo(2) atoms.
Pr2Mo4O15 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 7-coordinate geometry to one O(1), one O(11), one O(13), one O(15), one O(6), one O(8), and one O(9) atom. The Pr(1)-O(1) bond length is 2.42 Å. The Pr(1)-O(11) bond length is 2.37 Å. The Pr(1)-O(13) bond length is 2.48 Å. The Pr(1)-O(15) bond length is 2.42 Å. The Pr(1)-O(6) bond length is 2.46 Å. The Pr(1)-O(8) bond length is 2.54 Å. The Pr(1)-O(9) bond length is 2.57 Å. In the second Pr site, Pr(2) is bonded in a 8-coordinate geometry to one O(10), one O(13), one O(14), one O(2), one O(3), one O(7), one O(8), and one O(9) atom. The Pr(2)-O(10) bond length is 2.44 Å. The Pr(2)-O(13) bond length is 2.55 Å. The Pr(2)-O(14) bond length is 2.42 Å. The Pr(2)-O(2) bond length is 2.44 Å. The Pr(2)-O(3) bond length is 2.47 Å. The Pr(2)-O(7) bond length is 2.46 Å. The Pr(2)-O(8) bond length is 2.55 Å. The Pr(2)-O(9) bond length is 2.82 Å. There are four inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a tetrahedral geometry to one O(12), one O(2), one O(5), and one O(9) atom. The Mo(1)-O(12) bond length is 1.77 Å. The Mo(1)-O(2) bond length is 1.79 Å. The Mo(1)-O(5) bond length is 1.85 Å. The Mo(1)-O(9) bond length is 1.80 Å. In the second Mo site, Mo(2) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(4), one O(5), and two equivalent O(15) atoms. The Mo(2)-O(10) bond length is 1.79 Å. The Mo(2)-O(12) bond length is 2.39 Å. The Mo(2)-O(4) bond length is 1.71 Å. The Mo(2)-O(5) bond length is 2.01 Å. There is one shorter (1.93 Å) and one longer (2.16 Å) Mo(2)-O(15) bond length. In the third Mo site, Mo(3) is bonded in a tetrahedral geometry to one O(11), one O(3), one O(7), and one O(8) atom. The Mo(3)-O(11) bond length is 1.79 Å. The Mo(3)-O(3) bond length is 1.78 Å. The Mo(3)-O(7) bond length is 1.78 Å. The Mo(3)-O(8) bond length is 1.84 Å. In the fourth Mo site, Mo(4) is bonded in a tetrahedral geometry to one O(1), one O(13), one O(14), and one O(6) atom. The Mo(4)-O(1) bond length is 1.78 Å. The Mo(4)-O(13) bond length is 1.84 Å. The Mo(4)-O(14) bond length is 1.79 Å. The Mo(4)-O(6) bond length is 1.78 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Pr(1) and one Mo(4) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Pr(2) and one Mo(1) atom. In the third O site, O(3) is bonded in a linear geometry to one Pr(2) and one Mo(3) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one Mo(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Mo(1) and one Mo(2) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Pr(1) and one Mo(4) atom. In the seventh O site, O(7) is bonded in a linear geometry to one Pr(2) and one Mo(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Pr(1), one Pr(2), and one Mo(3) atom. In the ninth O site, O(9) is bonded in a 1-coordinate geometry to one Pr(1), one Pr(2), and one Mo(1) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Pr(2) and one Mo(2) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Pr(1) and one Mo(3) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Mo(1) and one Mo(2) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Pr(1), one Pr(2), and one Mo(4) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Pr(2) and one Mo(4) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Pr(1) and two equivalent Mo(2) atoms.