Clusters of electron-poor group 3 elements (R) need an endohedral atom (Z) to stabilize the cluster {ZRx} mainly through Z-R bonding interactions. There is an increasing number of rare-earth metal clusters sequestering transition metal atoms, mainly from groups 8 to 10. Isolated clusters with halide ligands (X) which are partly shared between the cluster complexes {ZRx}Xz are rare, for example in {IrEr6}I10. In the majority of cases, clusters share common cluster atoms, and thus share edges or faces. Coordination numbers of the endohedral atoms vary between 4 (tetrahedron) and 8 (cube or square antiprism) with 6 (octahedron) majoring. In {Ru5Lu20}I24, for example, cubes and square antiprisms {RuLu8} share common square faces to a one-dimensional intermetallic, surrounded by (and connected through) iodide ligands. The same polyhedra, and in addition such with nine- and ten-coordinate ruthenium atoms, are seen in the three-dimensional intermetallic compound {Ru11Lu20}.

Symbiosis of intermetallic and salt in rare-earth metal cluster complexes with endohedral transition-metal atoms

245th National Meeting (2013)

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