EuNiIn4 crystallizes in the orthorhombic Cmcm space group. Eu(1) is bonded in a 15-coordinate geometry to two equivalent Ni(1), three equivalent In(2), four equivalent In(3), and six equivalent In(1) atoms. Ni(1) is bonded in a 9-coordinate geometry to two equivalent Eu(1), one In(2), and six equivalent In(1) atoms. There are three inequivalent In sites. In the first In site, In(1) is bonded in a 5-coordinate geometry to three equivalent Eu(1), three equivalent Ni(1), and one In(3) atom. In the second In site, In(2) is bonded in a 2-coordinate geometry to three equivalent Eu(1), one Ni(1), and four equivalent In(3) atoms. In the third In site, In(3) is bonded in a 10-coordinate geometry to four equivalent Eu(1), two equivalent In(1), and four equivalent In(2) atoms.
EuNiIn4 crystallizes in the orthorhombic Cmcm space group. Eu(1) is bonded in a 15-coordinate geometry to two equivalent Ni(1), three equivalent In(2), four equivalent In(3), and six equivalent In(1) atoms. Both Eu(1)-Ni(1) bond lengths are 3.48 Å. There is one shorter (3.32 Å) and two longer (3.73 Å) Eu(1)-In(2) bond lengths. All Eu(1)-In(3) bond lengths are 3.57 Å. There are four shorter (3.35 Å) and two longer (3.52 Å) Eu(1)-In(1) bond lengths. Ni(1) is bonded in a 9-coordinate geometry to two equivalent Eu(1), one In(2), and six equivalent In(1) atoms. The Ni(1)-In(2) bond length is 2.56 Å. There are two shorter (2.62 Å) and four longer (2.76 Å) Ni(1)-In(1) bond lengths. There are three inequivalent In sites. In the first In site, In(1) is bonded in a 5-coordinate geometry to three equivalent Eu(1), three equivalent Ni(1), and one In(3) atom. The In(1)-In(3) bond length is 3.26 Å. In the second In site, In(2) is bonded in a 2-coordinate geometry to three equivalent Eu(1), one Ni(1), and four equivalent In(3) atoms. All In(2)-In(3) bond lengths are 3.16 Å. In the third In site, In(3) is bonded in a 10-coordinate geometry to four equivalent Eu(1), two equivalent In(1), and four equivalent In(2) atoms.