Nd5S9 crystallizes in the monoclinic C2 space group. There are five inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to one S(10), one S(2), one S(6), one S(7), two equivalent S(1), and two equivalent S(3) atoms. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to one S(2), one S(3), one S(4), two equivalent S(5), two equivalent S(8), and two equivalent S(9) atoms. In the third Nd site, Nd(3) is bonded in a 8-coordinate geometry to one S(1), one S(10), one S(4), one S(5), one S(6), one S(7), and two equivalent S(2) atoms. In the fourth Nd site, Nd(4) is bonded in a 8-coordinate geometry to one S(5), one S(7), one S(8), one S(9), two equivalent S(1), and two equivalent S(3) atoms. In the fifth Nd site, Nd(5) is bonded in a 8-coordinate geometry to one S(2), one S(5), one S(7), one S(8), one S(9), and three equivalent S(4) atoms. There are ten inequivalent S sites. In the first S site, S(8) is bonded in a 4-coordinate geometry to one Nd(4), one Nd(5), and two equivalent Nd(2) atoms. In the second S site, S(9) is bonded in a 4-coordinate geometry to one Nd(4), one Nd(5), and two equivalent Nd(2) atoms. In the third S site, S(10) is bonded in a 8-coordinate geometry to two equivalent Nd(1), two equivalent Nd(3), two equivalent S(6), and two equivalent S(7) atoms. In the fourth S site, S(1) is bonded to one Nd(3), two equivalent Nd(1), and two equivalent Nd(4) atoms to form a mixture of distorted edge and corner-sharing SNd5 trigonal bipyramids. In the fifth S site, S(2) is bonded to one Nd(1), one Nd(2), one Nd(5), and two equivalent Nd(3) atoms to form a mixture of distorted edge and corner-sharing SNd5 trigonal bipyramids. In the sixth S site, S(3) is bonded to one Nd(2), two equivalent Nd(1), and two equivalent Nd(4) atoms to form a mixture of distorted edge and corner-sharing SNd5 trigonal bipyramids. In the seventh S site, S(4) is bonded to one Nd(2), one Nd(3), and three equivalent Nd(5) atoms to form a mixture of distorted edge and corner-sharing SNd5 trigonal bipyramids. In the eighth S site, S(5) is bonded to one Nd(3), one Nd(4), one Nd(5), and two equivalent Nd(2) atoms to form a mixture of distorted edge and corner-sharing SNd5 trigonal bipyramids. In the ninth S site, S(6) is bonded in a 4-coordinate geometry to two equivalent Nd(1), two equivalent Nd(3), and two equivalent S(10) atoms. In the tenth S site, S(7) is bonded in a 5-coordinate geometry to one Nd(1), one Nd(3), one Nd(4), one Nd(5), and one S(10) atom.
Nd5S9 crystallizes in the monoclinic C2 space group. There are five inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to one S(10), one S(2), one S(6), one S(7), two equivalent S(1), and two equivalent S(3) atoms. The Nd(1)-S(10) bond length is 3.00 Å. The Nd(1)-S(2) bond length is 2.92 Å. The Nd(1)-S(6) bond length is 2.99 Å. The Nd(1)-S(7) bond length is 2.89 Å. There is one shorter (2.85 Å) and one longer (2.86 Å) Nd(1)-S(1) bond length. There is one shorter (2.92 Å) and one longer (2.93 Å) Nd(1)-S(3) bond length. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to one S(2), one S(3), one S(4), two equivalent S(5), two equivalent S(8), and two equivalent S(9) atoms. The Nd(2)-S(2) bond length is 3.02 Å. The Nd(2)-S(3) bond length is 3.03 Å. The Nd(2)-S(4) bond length is 3.05 Å. There is one shorter (2.89 Å) and one longer (2.90 Å) Nd(2)-S(5) bond length. Both Nd(2)-S(8) bond lengths are 3.04 Å. There is one shorter (2.94 Å) and one longer (2.95 Å) Nd(2)-S(9) bond length. In the third Nd site, Nd(3) is bonded in a 8-coordinate geometry to one S(1), one S(10), one S(4), one S(5), one S(6), one S(7), and two equivalent S(2) atoms. The Nd(3)-S(1) bond length is 2.91 Å. The Nd(3)-S(10) bond length is 3.02 Å. The Nd(3)-S(4) bond length is 2.91 Å. The Nd(3)-S(5) bond length is 2.92 Å. The Nd(3)-S(6) bond length is 3.01 Å. The Nd(3)-S(7) bond length is 2.89 Å. There is one shorter (2.85 Å) and one longer (2.88 Å) Nd(3)-S(2) bond length. In the fourth Nd site, Nd(4) is bonded in a 8-coordinate geometry to one S(5), one S(7), one S(8), one S(9), two equivalent S(1), and two equivalent S(3) atoms. The Nd(4)-S(5) bond length is 2.97 Å. The Nd(4)-S(7) bond length is 3.11 Å. The Nd(4)-S(8) bond length is 2.88 Å. The Nd(4)-S(9) bond length is 2.89 Å. There is one shorter (2.93 Å) and one longer (2.94 Å) Nd(4)-S(1) bond length. There is one shorter (2.84 Å) and one longer (2.88 Å) Nd(4)-S(3) bond length. In the fifth Nd site, Nd(5) is bonded in a 8-coordinate geometry to one S(2), one S(5), one S(7), one S(8), one S(9), and three equivalent S(4) atoms. The Nd(5)-S(2) bond length is 2.94 Å. The Nd(5)-S(5) bond length is 3.00 Å. The Nd(5)-S(7) bond length is 3.12 Å. The Nd(5)-S(8) bond length is 2.89 Å. The Nd(5)-S(9) bond length is 2.89 Å. There are a spread of Nd(5)-S(4) bond distances ranging from 2.85-2.94 Å. There are ten inequivalent S sites. In the first S site, S(8) is bonded in a 4-coordinate geometry to one Nd(4), one Nd(5), and two equivalent Nd(2) atoms. In the second S site, S(9) is bonded in a 4-coordinate geometry to one Nd(4), one Nd(5), and two equivalent Nd(2) atoms. In the third S site, S(10) is bonded in a 8-coordinate geometry to two equivalent Nd(1), two equivalent Nd(3), two equivalent S(6), and two equivalent S(7) atoms. There is one shorter (2.76 Å) and one longer (2.77 Å) S(10)-S(6) bond length. Both S(10)-S(7) bond lengths are 2.49 Å. In the fourth S site, S(1) is bonded to one Nd(3), two equivalent Nd(1), and two equivalent Nd(4) atoms to form a mixture of distorted edge and corner-sharing SNd5 trigonal bipyramids. In the fifth S site, S(2) is bonded to one Nd(1), one Nd(2), one Nd(5), and two equivalent Nd(3) atoms to form a mixture of distorted edge and corner-sharing SNd5 trigonal bipyramids. In the sixth S site, S(3) is bonded to one Nd(2), two equivalent Nd(1), and two equivalent Nd(4) atoms to form a mixture of distorted edge and corner-sharing SNd5 trigonal bipyramids. In the seventh S site, S(4) is bonded to one Nd(2), one Nd(3), and three equivalent Nd(5) atoms to form a mixture of distorted edge and corner-sharing SNd5 trigonal bipyramids. In the eighth S site, S(5) is bonded to one Nd(3), one Nd(4), one Nd(5), and two equivalent Nd(2) atoms to form a mixture of distorted edge and corner-sharing SNd5 trigonal bipyramids. In the ninth S site, S(6) is bonded in a 4-coordinate geometry to two equivalent Nd(1), two equivalent Nd(3), and two equivalent S(10) atoms. In the tenth S site, S(7) is bonded in a 5-coordinate geometry to one Nd(1), one Nd(3), one Nd(4), one Nd(5), and one S(10) atom.