KEu2Cl5 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 8-coordinate geometry to two equivalent Cl(1), two equivalent Cl(2), two equivalent Cl(3), and two equivalent Cl(4) atoms. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to two equivalent Cl(2), two equivalent Cl(3), two equivalent Cl(4), and two equivalent Cl(5) atoms. In the second Eu site, Eu(2) is bonded to one Cl(2), one Cl(3), one Cl(4), two equivalent Cl(1), and two equivalent Cl(5) atoms to form distorted edge-sharing EuCl7 pentagonal bipyramids. There are five inequivalent Cl sites. In the first Cl site, Cl(1) is bonded to two equivalent K(1) and two equivalent Eu(2) atoms to form distorted ClK2Eu2 tetrahedra that share corners with four equivalent Cl(4)K2Eu3 square pyramids, corners with two equivalent Cl(1)K2Eu2 tetrahedra, corners with four equivalent Cl(5)Eu4 tetrahedra, corners with two equivalent Cl(2)K2Eu3 trigonal bipyramids, corners with two equivalent Cl(3)K2Eu3 trigonal bipyramids,  an edgeedge with one Cl(4)K2Eu3 square pyramid,  an edgeedge with one Cl(1)K2Eu2 tetrahedra, edges with two equivalent Cl(2)K2Eu3 trigonal bipyramids, and edges with two equivalent Cl(3)K2Eu3 trigonal bipyramids. In the second Cl site, Cl(2) is bonded to two equivalent K(1), one Eu(2), and two equivalent Eu(1) atoms to form distorted ClK2Eu3 trigonal bipyramids that share corners with five equivalent Cl(4)K2Eu3 square pyramids, corners with two equivalent Cl(5)Eu4 tetrahedra, corners with two equivalent Cl(1)K2Eu2 tetrahedra,  a cornercorner with one Cl(3)K2Eu3 trigonal bipyramid, corners with four equivalent Cl(2)K2Eu3 trigonal bipyramids, edges with two equivalent Cl(4)K2Eu3 square pyramids, edges with two equivalent Cl(5)Eu4 tetrahedra, edges with two equivalent Cl(1)K2Eu2 tetrahedra, and edges with four equivalent Cl(3)K2Eu3 trigonal bipyramids. In the third Cl site, Cl(3) is bonded to two equivalent K(1), one Eu(2), and two equivalent Eu(1) atoms to form ClK2Eu3 trigonal bipyramids that share corners with four equivalent Cl(4)K2Eu3 square pyramids, corners with two equivalent Cl(5)Eu4 tetrahedra, corners with two equivalent Cl(1)K2Eu2 tetrahedra,  a cornercorner with one Cl(2)K2Eu3 trigonal bipyramid, corners with four equivalent Cl(3)K2Eu3 trigonal bipyramids,  an edgeedge with one Cl(4)K2Eu3 square pyramid, edges with two equivalent Cl(5)Eu4 tetrahedra, edges with two equivalent Cl(1)K2Eu2 tetrahedra, edges with four equivalent Cl(2)K2Eu3 trigonal bipyramids, and  a faceface with one Cl(4)K2Eu3 square pyramid. In the fourth Cl site, Cl(4) is bonded to two equivalent K(1), one Eu(2), and two equivalent Eu(1) atoms to form ClK2Eu3 square pyramids that share corners with four equivalent Cl(5)Eu4 tetrahedra, corners with four equivalent Cl(1)K2Eu2 tetrahedra, corners with four equivalent Cl(3)K2Eu3 trigonal bipyramids, corners with five equivalent Cl(2)K2Eu3 trigonal bipyramids, edges with two equivalent Cl(4)K2Eu3 square pyramids,  an edgeedge with one Cl(5)Eu4 tetrahedra,  an edgeedge with one Cl(1)K2Eu2 tetrahedra,  an edgeedge with one Cl(3)K2Eu3 trigonal bipyramid, edges with two equivalent Cl(2)K2Eu3 trigonal bipyramids, and  a faceface with one Cl(3)K2Eu3 trigonal bipyramid. In the fifth Cl site, Cl(5) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form ClEu4 tetrahedra that share corners with four equivalent Cl(4)K2Eu3 square pyramids, corners with two equivalent Cl(5)Eu4 tetrahedra, corners with four equivalent Cl(1)K2Eu2 tetrahedra, corners with two equivalent Cl(2)K2Eu3 trigonal bipyramids, corners with two equivalent Cl(3)K2Eu3 trigonal bipyramids,  an edgeedge with one Cl(4)K2Eu3 square pyramid,  an edgeedge with one Cl(5)Eu4 tetrahedra, edges with two equivalent Cl(2)K2Eu3 trigonal bipyramids, and edges with two equivalent Cl(3)K2Eu3 trigonal bipyramids.
KEu2Cl5 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 8-coordinate geometry to two equivalent Cl(1), two equivalent Cl(2), two equivalent Cl(3), and two equivalent Cl(4) atoms. There is one shorter (3.10 Å) and one longer (3.18 Å) K(1)-Cl(1) bond length. There is one shorter (3.34 Å) and one longer (3.54 Å) K(1)-Cl(2) bond length. There is one shorter (3.26 Å) and one longer (3.27 Å) K(1)-Cl(3) bond length. There is one shorter (3.28 Å) and one longer (3.34 Å) K(1)-Cl(4) bond length. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to two equivalent Cl(2), two equivalent Cl(3), two equivalent Cl(4), and two equivalent Cl(5) atoms. There is one shorter (3.00 Å) and one longer (3.08 Å) Eu(1)-Cl(2) bond length. There is one shorter (2.97 Å) and one longer (3.03 Å) Eu(1)-Cl(3) bond length. There is one shorter (2.98 Å) and one longer (2.99 Å) Eu(1)-Cl(4) bond length. There is one shorter (3.01 Å) and one longer (3.02 Å) Eu(1)-Cl(5) bond length. In the second Eu site, Eu(2) is bonded to one Cl(2), one Cl(3), one Cl(4), two equivalent Cl(1), and two equivalent Cl(5) atoms to form distorted edge-sharing EuCl7 pentagonal bipyramids. The Eu(2)-Cl(2) bond length is 2.93 Å. The Eu(2)-Cl(3) bond length is 2.98 Å. The Eu(2)-Cl(4) bond length is 3.01 Å. There is one shorter (2.84 Å) and one longer (2.91 Å) Eu(2)-Cl(1) bond length. There is one shorter (2.90 Å) and one longer (2.92 Å) Eu(2)-Cl(5) bond length. There are five inequivalent Cl sites. In the first Cl site, Cl(1) is bonded to two equivalent K(1) and two equivalent Eu(2) atoms to form distorted ClK2Eu2 tetrahedra that share corners with four equivalent Cl(4)K2Eu3 square pyramids, corners with two equivalent Cl(1)K2Eu2 tetrahedra, corners with four equivalent Cl(5)Eu4 tetrahedra, corners with two equivalent Cl(2)K2Eu3 trigonal bipyramids, corners with two equivalent Cl(3)K2Eu3 trigonal bipyramids,  an edgeedge with one Cl(4)K2Eu3 square pyramid,  an edgeedge with one Cl(1)K2Eu2 tetrahedra, edges with two equivalent Cl(2)K2Eu3 trigonal bipyramids, and edges with two equivalent Cl(3)K2Eu3 trigonal bipyramids. In the second Cl site, Cl(2) is bonded to two equivalent K(1), one Eu(2), and two equivalent Eu(1) atoms to form distorted ClK2Eu3 trigonal bipyramids that share corners with five equivalent Cl(4)K2Eu3 square pyramids, corners with two equivalent Cl(5)Eu4 tetrahedra, corners with two equivalent Cl(1)K2Eu2 tetrahedra,  a cornercorner with one Cl(3)K2Eu3 trigonal bipyramid, corners with four equivalent Cl(2)K2Eu3 trigonal bipyramids, edges with two equivalent Cl(4)K2Eu3 square pyramids, edges with two equivalent Cl(5)Eu4 tetrahedra, edges with two equivalent Cl(1)K2Eu2 tetrahedra, and edges with four equivalent Cl(3)K2Eu3 trigonal bipyramids. In the third Cl site, Cl(3) is bonded to two equivalent K(1), one Eu(2), and two equivalent Eu(1) atoms to form ClK2Eu3 trigonal bipyramids that share corners with four equivalent Cl(4)K2Eu3 square pyramids, corners with two equivalent Cl(5)Eu4 tetrahedra, corners with two equivalent Cl(1)K2Eu2 tetrahedra,  a cornercorner with one Cl(2)K2Eu3 trigonal bipyramid, corners with four equivalent Cl(3)K2Eu3 trigonal bipyramids,  an edgeedge with one Cl(4)K2Eu3 square pyramid, edges with two equivalent Cl(5)Eu4 tetrahedra, edges with two equivalent Cl(1)K2Eu2 tetrahedra, edges with four equivalent Cl(2)K2Eu3 trigonal bipyramids, and  a faceface with one Cl(4)K2Eu3 square pyramid. In the fourth Cl site, Cl(4) is bonded to two equivalent K(1), one Eu(2), and two equivalent Eu(1) atoms to form ClK2Eu3 square pyramids that share corners with four equivalent Cl(5)Eu4 tetrahedra, corners with four equivalent Cl(1)K2Eu2 tetrahedra, corners with four equivalent Cl(3)K2Eu3 trigonal bipyramids, corners with five equivalent Cl(2)K2Eu3 trigonal bipyramids, edges with two equivalent Cl(4)K2Eu3 square pyramids,  an edgeedge with one Cl(5)Eu4 tetrahedra,  an edgeedge with one Cl(1)K2Eu2 tetrahedra,  an edgeedge with one Cl(3)K2Eu3 trigonal bipyramid, edges with two equivalent Cl(2)K2Eu3 trigonal bipyramids, and  a faceface with one Cl(3)K2Eu3 trigonal bipyramid. In the fifth Cl site, Cl(5) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form ClEu4 tetrahedra that share corners with four equivalent Cl(4)K2Eu3 square pyramids, corners with two equivalent Cl(5)Eu4 tetrahedra, corners with four equivalent Cl(1)K2Eu2 tetrahedra, corners with two equivalent Cl(2)K2Eu3 trigonal bipyramids, corners with two equivalent Cl(3)K2Eu3 trigonal bipyramids,  an edgeedge with one Cl(4)K2Eu3 square pyramid,  an edgeedge with one Cl(5)Eu4 tetrahedra, edges with two equivalent Cl(2)K2Eu3 trigonal bipyramids, and edges with two equivalent Cl(3)K2Eu3 trigonal bipyramids.