Abstract

Dirac molecular orbital calculations (DSW-Xα) on the octahedral RuY 6I 12 2− and OsY 6I 12 2− clusters are reported. The calculated valence relativistic density of states clearly indicates that spin-orbit interaction is strongly acting on each constituent atom of both clusters, thus broadening the cluster valence bands. The interstitial Ru and Os atoms acquire and provide electrons and orbitals for bonding interactions with the cubooctahedral Y 6I 12 cage. The calculated charge distributions indicate that these clusters could be formulated as Ru −0.968Y 6 +0.458I 12 −0.315 and Os −1.028Y 6 +0.524I 12 −0.343, respectively.

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