In der bimetallischen Komplexverbindung (I) verhält sich die Kobalt‐tetracarbonyl‐Gruppe wie ein Elektronenakzeptor, während die Tetracarbonyl‐ Gruppen der anderen Übergangsmetalle Elektronendonatoren sind.
The first metal carbonyl derivatives, L~[CO(CO)~]~.(THF), (THF = tetrahydrofuran; n = 3, 4), of divalent lanthanoids Ln (Ln = Sm, Eu, Yb) were prepared by treating Hwith an excess of Sm, Eu, or Yb in THF at room temperature; the title complexes were also formed in high yields from the reaction of stoicheiometric amounts of the appropriate Ln12 compounds and TICO(CO)~.
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