Eu(InSe2)2 crystallizes in the orthorhombic Cccm space group. Eu(1) is bonded in a 8-coordinate geometry to four equivalent Se(1) and four equivalent Se(2) atoms. In(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form edge-sharing InSe4 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(2) is bonded to two equivalent Eu(1) and two equivalent In(1) atoms to form a mixture of distorted corner and edge-sharing SeEu2In2 trigonal pyramids. In the second Se site, Se(1) is bonded to two equivalent Eu(1) and two equivalent In(1) atoms to form a mixture of corner and edge-sharing SeEu2In2 trigonal pyramids.
Eu(InSe2)2 crystallizes in the orthorhombic Cccm space group. Eu(1) is bonded in a 8-coordinate geometry to four equivalent Se(1) and four equivalent Se(2) atoms. All Eu(1)-Se(1) bond lengths are 3.22 Å. All Eu(1)-Se(2) bond lengths are 3.30 Å. In(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form edge-sharing InSe4 tetrahedra. There is one shorter (2.57 Å) and one longer (2.67 Å) In(1)-Se(1) bond length. Both In(1)-Se(2) bond lengths are 2.62 Å. There are two inequivalent Se sites. In the first Se site, Se(2) is bonded to two equivalent Eu(1) and two equivalent In(1) atoms to form a mixture of distorted corner and edge-sharing SeEu2In2 trigonal pyramids. In the second Se site, Se(1) is bonded to two equivalent Eu(1) and two equivalent In(1) atoms to form a mixture of corner and edge-sharing SeEu2In2 trigonal pyramids.