Lewis vs. Brønsted-basicities of diiron dithiolates: spectroscopic detection of the "rotated structure" and remarkable effects of ethane- vs. propanedithiolate

Chem Commun (Camb). 2007 May 28:(20):2019-21. doi: 10.1039/b700754j.

Abstract

The new complexes Fe2(S2CnH2n)(CO)2(dppv)2 (n = 2, 3; dppv = cis-1,2-C2H2(PPh2)2) form adducts with AlBr3 and B(C6F5)3, which adopt the "rotated structure" proposed for the active site of the Fe-only hydrogenases--the propanedithiolate is significantly more Lewis basic due to nonbonded interactions between the dithiolate strap and the ligands on Fe.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Ethane / chemistry*
  • Hydrogen-Ion Concentration
  • Iron Compounds / chemistry*
  • Models, Molecular
  • Molecular Conformation
  • Propane / analogs & derivatives*
  • Propane / chemistry
  • Rotation
  • Spectrum Analysis
  • Sulfhydryl Compounds / chemistry*

Substances

  • Iron Compounds
  • Sulfhydryl Compounds
  • propanedithiolate
  • Ethane
  • Propane