SmAsSe is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. Sm(1) is bonded in a 9-coordinate geometry to four equivalent As(1) and five equivalent Se(1) atoms. As(1) is bonded in a 8-coordinate geometry to four equivalent Sm(1) and four equivalent As(1) atoms. Se(1) is bonded to five equivalent Sm(1) atoms to form a mixture of distorted corner and edge-sharing SeSm5 trigonal bipyramids.
SmAsSe is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. Sm(1) is bonded in a 9-coordinate geometry to four equivalent As(1) and five equivalent Se(1) atoms. All Sm(1)-As(1) bond lengths are 3.19 Å. There are four shorter (2.94 Å) and one longer (3.13 Å) Sm(1)-Se(1) bond length. As(1) is bonded in a 8-coordinate geometry to four equivalent Sm(1) and four equivalent As(1) atoms. All As(1)-As(1) bond lengths are 2.80 Å. Se(1) is bonded to five equivalent Sm(1) atoms to form a mixture of distorted corner and edge-sharing SeSm5 trigonal bipyramids.