TbAsSe crystallizes in the orthorhombic Pnma space group. Tb(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 Tb(1) and four equivalent As(1) atoms. Se(1) is bonded to five equivalent Tb(1) atoms to form a mixture of distorted corner and edge-sharing SeTb5 trigonal bipyramids.
TbAsSe crystallizes in the orthorhombic Pnma space group. Tb(1) is bonded in a 9-coordinate geometry to four equivalent As(1) and five equivalent Se(1) atoms. There are a spread of Tb(1)-As(1) bond distances ranging from 3.06-3.18 Å. There are a spread of Tb(1)-Se(1) bond distances ranging from 2.89-3.03 Å. As(1) is bonded in a 8-coordinate geometry to four equivalent Tb(1) and four equivalent As(1) atoms. There are two shorter (2.55 Å) and two longer (3.02 Å) As(1)-As(1) bond lengths. Se(1) is bonded to five equivalent Tb(1) atoms to form a mixture of distorted corner and edge-sharing SeTb5 trigonal bipyramids.