Journal of Cluster Science

, Volume 26, Issue 1, pp 233–246 | Cite as

Alkynyl-Phosphine Substituted Fe2S2 Clusters: Synthesis, Structure and Spectroelectrochemical Characterization of a Cluster with a Class III Mixed-Valence [FeFe]3+ Core

  • Gregory L. Newman
  • Jamil M. A. Rahman
  • Josef B. G. Gluyas
  • Dmitry S. Yufit
  • Judith A. K. Howard
  • Paul J. Low
Original Paper


Phosphinoalkynes P(C≡CC6H4Me-4)Ph2 (1) and P(C≡CC6H4C≡CC6H4Me-4)Ph2 (2) have been prepared from CuI catalysed reactions of the corresponding 1-alkyne and PClPh2. The trimethylamine-N-oxide promoted reaction of PPh3, 1 or 2 with [Fe2(μ-pdt)(CO)6] (pdt = propanedithiolate) affords derivatives [Fe2(μ-pdt)(CO)5{PRPh2}] [R=Ph (3), C≡CC6H4Me (5), C≡CC6H4C≡CC6H4Me (6)] or, at elevated temperatures, [Fe2(μ-pdt)(CO)4(PPh3)2] (4). The cyclic voltammograms of compounds 3 and 4 feature almost fully reversible one-electron oxidation processes and an irreversible reduction, whilst the electrochemical response of the alkynyl phosphine substituted complexes 5 and 6 is irreversible for both oxidation and reduction. IR spectroelectrochemical studies of 4 are consistent with an oxidation processes leading to a delocalized or (Class III) mixed valence [FeFe]3+ core in which the iron centers have an average oxidation state of 1.5. The molecular structures of the alkynyl phosphine substituted clusters 5 and 6 are also reported.


Iron-only hydrogenase Spectroelectrochemistry Phosphino alkyne Trimethylamine-N-oxide Mixed-valence 


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Gregory L. Newman
    • 1
  • Jamil M. A. Rahman
    • 1
  • Josef B. G. Gluyas
    • 2
  • Dmitry S. Yufit
    • 1
  • Judith A. K. Howard
    • 1
  • Paul J. Low
    • 1
    • 2
  1. 1.Department of ChemistryDurham UniversityDurhamUK
  2. 2.School of Chemistry and BiochemistryUniversity of Western AustraliaPerthAustralia

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