Gd2W4O15 crystallizes in the triclinic P-1 space group. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 7-coordinate geometry to one O(13), one O(15), one O(2), one O(4), one O(6), one O(7), and one O(8) atom. In the second Gd site, Gd(2) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(13), one O(14), one O(15), one O(3), one O(5), and one O(8) atom. There are four inequivalent W sites. In the first W site, W(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(5), one O(9), and two equivalent O(2) atoms. In the second W site, W(2) is bonded in a tetrahedral geometry to one O(14), one O(3), one O(7), and one O(8) atom. In the third W site, W(3) is bonded in a tetrahedral geometry to one O(12), one O(15), one O(4), and one O(6) atom. In the fourth W site, W(4) is bonded in a tetrahedral geometry to one O(10), one O(11), one O(13), and one O(9) atom. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one W(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Gd(1) and two equivalent W(1) atoms. In the third O site, O(3) is bonded in a linear geometry to one Gd(2) and one W(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Gd(1) and one W(3) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Gd(2) and one W(1) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Gd(1) and one W(3) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Gd(1) and one W(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Gd(1), one Gd(2), and one W(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one W(1) and one W(4) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one W(1) and one W(4) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one Gd(2) and one W(4) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Gd(2) and one W(3) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Gd(1), one Gd(2), and one W(4) atom. In the fourteenth O site, O(14) is bonded in a linear geometry to one Gd(2) and one W(2) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Gd(1), one Gd(2), and one W(3) atom.
Gd2W4O15 crystallizes in the triclinic P-1 space group. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 7-coordinate geometry to one O(13), one O(15), one O(2), one O(4), one O(6), one O(7), and one O(8) atom. The Gd(1)-O(13) bond length is 2.51 Å. The Gd(1)-O(15) bond length is 2.41 Å. The Gd(1)-O(2) bond length is 2.36 Å. The Gd(1)-O(4) bond length is 2.39 Å. The Gd(1)-O(6) bond length is 2.32 Å. The Gd(1)-O(7) bond length is 2.28 Å. The Gd(1)-O(8) bond length is 2.47 Å. In the second Gd site, Gd(2) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(13), one O(14), one O(15), one O(3), one O(5), and one O(8) atom. The Gd(2)-O(11) bond length is 2.35 Å. The Gd(2)-O(12) bond length is 2.35 Å. The Gd(2)-O(13) bond length is 2.76 Å. The Gd(2)-O(14) bond length is 2.37 Å. The Gd(2)-O(15) bond length is 2.49 Å. The Gd(2)-O(3) bond length is 2.39 Å. The Gd(2)-O(5) bond length is 2.35 Å. The Gd(2)-O(8) bond length is 2.51 Å. There are four inequivalent W sites. In the first W site, W(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(5), one O(9), and two equivalent O(2) atoms. The W(1)-O(1) bond length is 1.74 Å. The W(1)-O(10) bond length is 2.00 Å. The W(1)-O(5) bond length is 1.82 Å. The W(1)-O(9) bond length is 2.32 Å. There is one shorter (1.95 Å) and one longer (2.14 Å) W(1)-O(2) bond length. In the second W site, W(2) is bonded in a tetrahedral geometry to one O(14), one O(3), one O(7), and one O(8) atom. The W(2)-O(14) bond length is 1.80 Å. The W(2)-O(3) bond length is 1.80 Å. The W(2)-O(7) bond length is 1.82 Å. The W(2)-O(8) bond length is 1.85 Å. In the third W site, W(3) is bonded in a tetrahedral geometry to one O(12), one O(15), one O(4), and one O(6) atom. The W(3)-O(12) bond length is 1.81 Å. The W(3)-O(15) bond length is 1.86 Å. The W(3)-O(4) bond length is 1.80 Å. The W(3)-O(6) bond length is 1.80 Å. In the fourth W site, W(4) is bonded in a tetrahedral geometry to one O(10), one O(11), one O(13), and one O(9) atom. The W(4)-O(10) bond length is 1.86 Å. The W(4)-O(11) bond length is 1.81 Å. The W(4)-O(13) bond length is 1.80 Å. The W(4)-O(9) bond length is 1.80 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one W(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Gd(1) and two equivalent W(1) atoms. In the third O site, O(3) is bonded in a linear geometry to one Gd(2) and one W(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Gd(1) and one W(3) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Gd(2) and one W(1) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Gd(1) and one W(3) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Gd(1) and one W(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Gd(1), one Gd(2), and one W(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one W(1) and one W(4) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one W(1) and one W(4) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one Gd(2) and one W(4) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Gd(2) and one W(3) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Gd(1), one Gd(2), and one W(4) atom. In the fourteenth O site, O(14) is bonded in a linear geometry to one Gd(2) and one W(2) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Gd(1), one Gd(2), and one W(3) atom.