Variation of the electron population by four units in the cluster series [(eta(5)-Cp ')(3)Mo3S4Co(L)](n+) (L = I, CO, PPh3, NO; n=0, 1)

Konrad Herbst, Emma Soderhjelm, Ebbe Nordlander, Lutz Dahlenburg, Michael Brorson

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The versatility of cuboidal Mo3S4Co clusters for the preparation of complexes with different numbers of valence shell electrons (VSE) in the cluster is described. The reaction of the geometrically incomplete cuboidal cluster salt [(eta(5)-Cp')(3)Mo3S4][pts] (pts = p-toluenesulfonate) with one molar equivalent of [Co-2(CO)(8)] afforded almost quantitatively the electroneutral 60 VSE cluster [(eta(5)-Cp')(3)Mo3S4Co(CO)] (1), which previously has been prepared in low yield by Curtis et al. in autoclave syntheses [M.D. Curtis, U. Riaz, O.J. Curnow, J.W. Kampf, Organometallics 14 (1995) 5337]. Cluster 1 was also obtained in high yield by reaction of [(eta(5)-Cp')(3)Mo3S4][pts] with [(eta(5)-Cp*)Co(CO)(2)]. Reaction of [(eta(5)-Cp')(3)Mo3S4][pts] with two molar equivalents of [Co(I)(CO)(3)(PPh3)] led to a complex mixture of products, of which the electron deficient 58 VSE cluster salt [(eta(5)-Cp')(3)Mo3S4Co(I)[Co(I)(3)(thf)] ([2][Co(I)(3)(thf)]) was isolated as single crystals. In the crystal structures of 1 and [2][Co(I)(3)(thf)], the Co-Mo bond lengths are almost identical, indicating a delocalization of the electron deficiency in [2](+). The reduced form of [2](+), [(eta(5)-Cp ')(3)Mo3S4Co(I)] (2), was prepared by oxidative substitution of the carbonyl ligand in 2 by I-2. Further reactions of 2 with PPh3 and NO leading to the 60 and 61 VSE cluster complexes [(eta(5)-Cp')(3)Mo3S4Co(PPh3)](3) and [(eta(5)-Cp')(3)Mo3S4Co(NO)] (4), respectively, enabled the preparation of Mo3S4Co clusters in altogether four different oxidation states.
Original languageEnglish
Pages (from-to)2697-2703
JournalInorganica Chimica Acta
Issue number8
Publication statusPublished - 2007

Bibliographical note

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Chemical Physics (S) (011001060)

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics


  • cuboidal
  • cluster
  • molybdenum
  • cobalt
  • electron deficiency


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